Os biopolímeros surgem como materiais alternativos no atendimento aos requisitos de desempenho que a área médica tem exigido para implantes ósseos. Nesse contexto o polímero poliuretano derivado de óleo de mamona (Ricinus communis) tem obtido lugar de destaque. Mesmo assim, esse material, considerado um biopolímero regenerador ósseo, ainda necessita de investigação mecânica consistente para uma aplicação de forma confiável. No entanto, há uma grande dificuldade em se prever o comportamento mecânico das estruturas fabricadas por biopolímeros. Diante desse fato, o presente projeto de pesquisa visa através de ensaios experimentais em amostras padronizadas para ensaios de tração e compressão, bem como, ensaios normalizados para próteses de quadril, adquirir propriedades de material adequadas para a implementação dos modelos computacionais, assim como dados de comportamento mecânico sob solicitação. De posse desses dados, através do método dos elementos finitos, são realizadas simulações computacionais com o objetivo de verificar a capacidade do modelo de material de Drucker-Prager representar o comportamento mecânico do biopolímero. Este modelo é aplicado inicialmente na simulação dos ensaios de tração e compressão e posteriormente nas simulações das próteses em biopolímero, onde carregamentos mais complexos estão presentes. Os resultados obtidos nas simulações são analisados e discutidos para fins de validação do uso deste modelo de material em estruturas fabricadas com o biopolímero. / Biopolymers have been widely used as alternative materials to attend the performance requirements that medical area has demanded to bone implants. In this way, the Castor Oil Polyurethane (Ricinus communis) has taken a distinct place. Nevertheless, this material, considered bone constructive, still needs a consisting mechanical investigation for a reliable application, despite the great difficulty to predict the mechanical behavior of biopolymer structures. Face this fact, this work intends through experiments in normalized specimens for tensile and compressive tests, as well as normalized tests for hip implants, to obtain material properties and mechanical behavior data required to implement computational models of the hip prosthesis. Using the finite element method, computational simulations are carried out to verify the capability of Drucker-Prager material model to represent the biopolymer mechanical behavior. This model is first applied in tensile and compressive tests simulations, and further in prosthesis biopolymer simulations, where more complex loadings are present. The results of these simulations are analyzed and discussed in order to validate the use of this material model in biopolymers structures.

La famille de matériaux polymériques 1D de type [Fe(Rtrz)3]Ax présente un phénomène detransition de spin, i.e. une modification réversible de la configuration électronique de l’ionmétallique pilotée par un stimulus (P, T, hv). Pour ces matériaux les caractéristiques detransition sont proches des pré-requis pour des applications technologiques. Ce travail, basésur des investigations par diffraction X aux frontières des possibilités, présente pour lapremière fois une description fiable des propriétés structurales de ces matériauxpolymériques aux différentes échelles (atomique à microscopique). D’une part l’originalitédes comportements structuraux observés est mise en relation avec les propriétés detransition de spin et d’autre part des aspects nouveaux tels que la fatigabilité, l’influence dela pression ou les morphologies des domaines cohérents sont explorés. Ces résultatsapportent des éléments essentiels à la compréhension et à la poursuite du développementde ces matériaux. / The 1D polymeric materials family of type [Fe(Rtrz)3]Ax exhibit a spin transitionphenomenon, i.e. a reversible modification of the electronic configuration of a metallic iondriven by a stimulus (P, T, hv). For these materials the transition characteristics are close tothe pre-requisite for technological applications. This work, based on X-ray diffractioninvestigations close to the limit of possibilities, presents for the first time a reliabledescription of the structural properties of these polymeric materials with different scales(atomic to microscopic). On one hand the original structural behavior observed is relatedwith the properties of the spin transition and on the other hand new aspects such as fatigue,the influence of pressure or morphologies of domain size are explored. These results provideessential elements for the understanding and the further development of these materials.

Thermal nanoimprint lithography (T-NIL) is a cheap and fast technique to produce nanopatterns in polymeric materials. It creates these patterns by pressing a stamp down into a polymer film that has been heated above its glass transition temperature. These nanopatterned polymer films can be used in a wide variety of scientific fields, not the least the organic semiconductor industry. There the nanopatterned films have, among else, been used to improve the efficiency of organic light-emitting diodes (OLEDs). The light-emitting electrochemical cell (LEC), which is similar in structure to an OLED, also uses polymer films in their device structure but the light emitting layer also contains an electrolyte. However, it has not been shown if nanopatterns can improve LECs as well or if it is even possible to make an imprint in their polymer films that are mixed with an electrolyte. This thesis shows that T-NIL can be used to imprint nanopatterns in films made of poly(ethylene oxide) and the conjugated polymer Super Yellow. The best nanopatterns were produced by setting the imprint parameters to  85 °C, 10 bar, 1800 s for poly(ethylene oxide) and 115 °C, 20 bar, 1800 s for Super Yellow. Imprints were also performed on polystyrene but no nanopatterns could be produced. This was most likely because the stamp could not handle the high temperature that is required to make a nanopattern in polystyrene. The best imprint parameters of Super Yellow were then used to produce a pattern in a film made of Super Yellow mixed with the salt tetrahexylammonium tetrafluoroborate (THABF4) in order to be able to produce one imprinted and one reference LEC. The imprinted LEC had a luminosity of 139 cd/m2, an improvement of 20% compared to the reference’s 115 cd/m2 when operated under identical conditions.  The forward direction and the angular dependent electroluminescence spectrum of the imprinted LEC clearly showed an effect not observed in the reference. These findings show that the polymer films used in a LEC can be imprinted with a nanopattern by using T-NIL. The imprinted films can be used to create functional LECs that show different behavior and a higher luminosity compared to a non-imprinted reference. If these results can be repeated it might be the starting point of a brighter future.

Os biopolímeros surgem como materiais alternativos no atendimento aos requisitos de desempenho que a área médica tem exigido para implantes ósseos. Nesse contexto o polímero poliuretano derivado de óleo de mamona (Ricinus communis) tem obtido lugar de destaque. Mesmo assim, esse material, considerado um biopolímero regenerador ósseo, ainda necessita de investigação mecânica consistente para uma aplicação de forma confiável. No entanto, há uma grande dificuldade em se prever o comportamento mecânico das estruturas fabricadas por biopolímeros. Diante desse fato, o presente projeto de pesquisa visa através de ensaios experimentais em amostras padronizadas para ensaios de tração e compressão, bem como, ensaios normalizados para próteses de quadril, adquirir propriedades de material adequadas para a implementação dos modelos computacionais, assim como dados de comportamento mecânico sob solicitação. De posse desses dados, através do método dos elementos finitos, são realizadas simulações computacionais com o objetivo de verificar a capacidade do modelo de material de Drucker-Prager representar o comportamento mecânico do biopolímero. Este modelo é aplicado inicialmente na simulação dos ensaios de tração e compressão e posteriormente nas simulações das próteses em biopolímero, onde carregamentos mais complexos estão presentes. Os resultados obtidos nas simulações são analisados e discutidos para fins de validação do uso deste modelo de material em estruturas fabricadas com o biopolímero. / Biopolymers have been widely used as alternative materials to attend the performance requirements that medical area has demanded to bone implants. In this way, the Castor Oil Polyurethane (Ricinus communis) has taken a distinct place. Nevertheless, this material, considered bone constructive, still needs a consisting mechanical investigation for a reliable application, despite the great difficulty to predict the mechanical behavior of biopolymer structures. Face this fact, this work intends through experiments in normalized specimens for tensile and compressive tests, as well as normalized tests for hip implants, to obtain material properties and mechanical behavior data required to implement computational models of the hip prosthesis. Using the finite element method, computational simulations are carried out to verify the capability of Drucker-Prager material model to represent the biopolymer mechanical behavior. This model is first applied in tensile and compressive tests simulations, and further in prosthesis biopolymer simulations, where more complex loadings are present. The results of these simulations are analyzed and discussed in order to validate the use of this material model in biopolymers structures.

Les matériaux polymères poreux font l'objet d'intenses recherches depuis de nombreuses années et présentent certains avantages importants par rapport à leurs homologues inorganiques, comme des propriétés mécaniques modulables, une fonctionnalisation aisée et surtout un coût de production plus faible. Au cours de la dernière décennie, les matériaux à double porosité ont attiré une attention particulière de la communauté scientifique car ces matériaux offrent de nouvelles perspectives intéressantes pour l'élaboration de matériaux durables. Le rôle de chaque niveau de porosité est différent et associé à des processus de transfert de masse distincts. Les macropores (~ 100 µm) permettraient l'écoulement de macromolécules ou de cellules à travers le matériau, tandis qu'un réseau nanoporeux (10-100 nm) serait dédié au passage de molécules plus petites, agissant ainsi comme un deuxième mécanisme de transport, en particulier lorsque des macropores sont totalement obstrués. La première partie de ce travail porte sur le développement d'approches polyvalentes et efficaces pour la préparation de matériaux à double porosité biocompatibles à base de poly(méthacrylate de 2-hydroxyéthyle) (PHEMA). La première approche a reposé sur l'utilisation de deux types distincts de gabarits porogènes, à savoir un macroporogène et un nanoporogène. Pour générer la macroporosité, soit des particules de NaCl ou des billes de PMMA, pouvant être fusionnées ou non, ont été utilisées afin de contrôler la morphologie l'interconnectivité des pores. Le nanoporosité a été obtenue en utilisant diverses quantités de différents solvants porogènes, générant ainsi une large gamme de distributions de tailles de pores pour ce second niveau de porosité. La seconde méthodologie a été fondée sur le procédé de séparation de phases induite thermiquement. Un mélange de co-solvants constitué de dioxane et d'eau a été utilisé pour solubiliser le PHEMA linéaire préalablement préparé, suivi par un processus de solidification par congélation du mélange de co-solvants / PHEMA, et sublimation consécutive des co-solvants pour produire les matériaux de PHEMA biporeux correspondants. Enfin, les matériaux à double porosité ont été valorisés à travers différentes réactions de fonctionnalisation en utilisant la chimie du carbonyldiimidazole, et l'immobilisation postérieure de nanoparticules d'or générées in-situ. De tels matériaux hybrides à double porosité se sont avérés être des supports catalytiques efficaces.Dans la deuxième partie, nous avons déterminé numériquement la perméabilité des matériaux à double porosité. La méthodologie a été fondée sur une approche à double changement d'échelle dans le cadre des théories d'homogénéisation périodique et sur des calculs de cellules élémentaires. Le premier changement d'échelle a consisté à déterminer une première perméabilité associée au réseau de nanopores. A cette échelle, les pores ont été saturés par un fluide visqueux obéissant aux équations de Stokes et le problème a été résolu par une approche classiques d'éléments finis ou en utilisant des techniques plus récentes à base de la transformée de Fourier rapide. À l'échelle mésoscopique, l'écoulement du fluide a obéi aux équations de Stokes dans les macropores et aux équations de Darcy dans le solide perméable. Le problème de cellules élémentaires couplant les équations de Darcy et Stokes a été résolu par la méthode des éléments finis afin de calculer la perméabilité macroscopique finale. Dans cette optique, nous avons développé une méthode fondée sur une formulation variationnelle mixte qui a été mise en œuvre en prenant différents éléments dans les domaines de solide et fluide. Divers exemples 2D et 3D sont fournis pour illustrer la précision et la capacité des méthodes numériques proposées pour calculer la perméabilité macroscopique des matériaux biporeux / Polymer-based porous materials have been the subject of intense research for many years and present some important advantages over their inorganic counterparts, such as tunable mechanical properties, ease to be functionalized, and especially lower production cost. Over the last decade, materials with dual porosity have attracted a particular attention from the scientific community, as these peculiar materials offer new interesting perspectives for engineering sustainable materials. The role of each porosity level is different and associated with distinct mass transfer processes. Macropores (~100 µm) would allow macromolecules and cells flow through the material, while a nanoporous network (10-100 nm) would be dedicated to the passage of smaller molecules, thus acting as a second transport mechanism, especially when macropores are totally clogged. The first part of this work addresses the development of versatile and effective approaches to biocompatible doubly porous poly(2-hydroxyethyl methacrylate) (PHEMA)-based materials. The first approach relied on the use of two distinct types of porogen templates, i.e. a macroporogen and a nanoporogen. To generate the macroporosity, either NaCl particles or PMMA beads that could be fused or not, were used in order to control the pore morphology and interconnectivity of the materials. The nanoporosity was obtained by using various amounts of different porogenic solvents, thus generating a wide range of pore size distributions for this second porosity level. The second methodology was based on the thermally-induced phase separation process. A co-solvent mixture constituted of dioxane and water was used to solubilize previously prepared linear PHEMA, followed by a solidification process by freezing the co-solvents/PHEMA mixture, and subsequent sublimation of the co-solvents to generate the corresponding biporous PHEMA materials. Finally, advantage of doubly porous materials was taken through different functionalization reactions using carbonyldiimidazole chemistry, and further immobilization of in-situ generated gold nanoparticles. Such hybrid doubly porous materials proved to act as efficient catalytic supports. In the second part, we numerically determined the permeability of doubly porous materials. The methodology was based on a double upscaling approach in the field of periodic homogenization theories and on unit cell calculations. The first upscaling consisted in the determination of a first permeability associated with the array of nanoscopic pores. At this scale, the pores were saturated by a viscous fluid obeying the Stokes equations and the problem was solved by means of standard Finite-Element approaches or using more recent techniques based on Fast Fourier Transform. At the mesoscopic scale, the fluid flow obeyed the Stokes equations in the macropores and the Darcy equations in the permeable solid. The unit cell problem coupling Darcy and Stokes equations was solved by the Finite Element method in order to compute the final macroscopic permeability. To this purpose, we developed a method based on a mixed variational formulation which was implemented by taking different elements in the solid and fluid regions. Various 2D and 3D examples were provided to illustrate the accuracy and the capacity of the proposed numerical methods to compute the macroscopic permeability of biporous materials

This report describes how a car sun visor can be designed in order to meet a sustainability certification called Cradle to Cradle Certified® (C2C). The thesis is a final project for the university program Mechanical Engineering: Product Development and Design at School of engineering, Jönköping University. The thesis is in a collaboration with Polestar, a performance electric car brand with the goal to build sustainable electric cars and help create a sustainable society. One way to take this sustainability work forward is to apply C2C certifications to their products. The aim of the project was therefore to present how a sun visor from a Polestar model would meet the C2C requirements, and to develop a concept and prototype that can potentially receive a C2C certification. The project also aimed to present important conclusions about how C2C affects the product development process. The project was divided into two main sections, one deeper study of C2C and one conceptual design study. The work began with examining the structure and requirements of C2C. These were then compared to Polestar’s sun visor. Several product development phases were carried out with Bootcamp bootleg and the C2C process to develop concepts that could meet C2C´s and Polestar´s requirements. The concepts were then presented to a focus group in order to select a concept for further development. The result is a conceptual sun visor that is well adapted for C2C. The concept has a big focus on sustainable and safe materials, functions for circularity, with an extra focus on a simple disassembly process. According to the project group, the concept is assessed to possess the potential for the third highest ranking in the C2C certification. The project also resulted in a prototype to present the concept, functions and materials. / I denna rapport redovisas hur solskyddet i en bil kan designas i syfte att uppfylla en hållbarhetscertifiering kallad Cradle to Cradle Certified® (C2C). Examensarbetet är ett slutprojekt för högskoleprogrammet Maskinteknik: Produktutveckling och design vid Tekniska Högskolan i Jönköping. Examensarbetet genomförs i samarbete med Polestar, ett prestanda elbilsmärke som arbetar med att skapa hållbara elbilar för att bidra till ett hållbart samhälle. Ett sätt att föra detta hållbarhetsarbete framåt, är att tillämpa C2C-certifieringar på sina produkter. Målet med projektet blev därför att presentera hur ett solskydd från en Polestar modell uppfyller C2C-kraven, samt att ta fram ett koncept och prototyp som potentiellt kan få en C2C-certifiering. Projektet syftade även till att presentera viktiga slutsatser om hur C2C påverkar produktutvecklingsprocessen. Projektet delades in i två huvuddelar, en djupare studie av C2C och en konceptuell designstudie. Arbetet började med att undersöka uppbyggnaden samt kraven för C2C. Dessa jämfördes sedan mot Polestars solskydd. Flera produktutvecklingsfaser genomfördes med Bootcamp bootleg- och C2C processen för att ta fram koncept som kunde möta kraven från C2C och Polestar. Dessa presenterades sedan för en fokusgrupp i syfte att välja ut ett koncept att utveckla vidare. Resultatet är ett konceptuellt solskydd som är väl anpassat för C2C. Konceptet har stort fokus på hållbara och säkra material, gedigna funktioner för cirkuläritet, med ett extra fokus på en enkel demonteringsprocess. Konceptet bedöms enligt projektgruppen besitta potentialen för den tredje högsta rankingen i C2C certifieringen. Projektet resulterade även i en fysisk prototyp för att presentera konceptet, funktioner och material.

Hyaluronan (HA) is a substance that is commonly used in biomedical applications in the form of hydrogels. One of these biomedical applications is dermatological fillers where HA is cross-linked with 1,4-Butanediol diglycidyl ether (BDDE) to reduce its rapid turnover within tissue. The filler gives a volumetric effect that can fill out wrinkles. This literature study was conducted in collaboration with Galderma to determine if there is research that explores additives to HA hydrogels that give both volumetric and biological effects when applied as filler. Biological effects that improve the skin's appearance and complexion such as a rejuvenation of the skin was preferable. Both polynucleotides and mannitol show great potential to act as additives in injectable hyaluronan hydrogels.  The main effect of polynucleotides (PN) added in hydrogels is that it is collagen stimulating and provides a more natural tissue regeneration. Rheological properties of the filler change with the addition of PN, where elasticity, viscosity and viscoelasticity have been shown to increase. PNs show no toxicity and are considered safe to inject. The study of mannitol has shown that it does not give a volumetric effect after the injected hydrogel has been broken down. What mannitol can help with, is to prolong the life of the hydrogel and reduce the swelling that is a common side effect after an injection. In addition to this, mannitol is a safe substance to inject.

This thesis was made in cooperation with Roxtec. Roxtec specialises in cable sealingsolutions and are world leading in their area. In many of Roxtec’s products steel isused in the frame holding the sealing rubber. To lower Roxtec’s environmental foot-print plastic would be used instead in the frames if possible, more specific polyamide6.6 with 25% glass fiber reinforcement (PA66GF25). Polyamide is affected to agreater extent by temperature and humidity than steel and therefore poses a greaterrisk when considering the sealing capability in harsh conditions. The purpose of thisthesis is therefore to investigate the effects on the Young’s modulus by temperatureand relative humidity, which both correlate to moisture content in the plastic. Theintended temperature and moisture saturation interval are -40◦C to 80◦C and 0% to100% moisture saturation respectively. Tensile test samples were made through machining samples from existing productsand conditioning them to desired moisture content. With the use of tensile testingthe Young’s modulus could be determined for a number of combinations of temper-ature and moisture content. From this data an approximated polynomial surfaceof the Young’s modulus could be produced. The conditioning of the test piecescould be accelerated by submersion in heated water, decreasing conditioning timeto less than two days. The approximation of the Young’s modulus function couldbe done using polynomial approximation. The resulting polynomial for the positivetemperatures was of the third order dependant of the two variables moisture con-tent and temperature. For the negative temperatures a single variable polynomialwas approximated due to only one moisture content being tested for. To ensure thevalidity of the model each test combination consisted of three individual tensile testof which an average was calculated. The approximated function was then comparedto a data sheet value for a certain moisture content and temperature. From theresulting surface approximation of the Young’s modulus in positive temperatures itcan be deduced that PA66GF25 is more greatly affected by moisture content thantemperature. Especially at low levels of moisture content where the rise in Young’smodulus is exponential while more linear at higher moisture contents. The maximumand minimum Young’s modulus was found to be 8 GPa and 2.7 GPa respectively.The negative temperature approximation was restricted to one moisture content andtherefore resulted in a graph. The behaviour of this graph was likely a result of icein the material as similarities to a study regarding the mechanical properties of icewas found. / Detta examensarbete gjordes i sammarbete med Roxtec. Roxtec specialialiserar sig ikabeltätningslösningar och är världsledande i området. I många av Roxtecs produk-ter så används stål till att försegla gummi. För att minska Roxtecs miljöpåverkan såskulle plast användas till tätningarnas ramar om möjligt, speficikt polyamid 6.6 med25% glasfiberförstärkning (PA66GF25). Polyamid påverkas till större andel av tem-peratur och luftfuktighet än stål och utsätts därmed för en större risk med avseendepå tätnings kapabiliteten i tuffa miljöer. Syftet med detta arbete är därmed attundersöka effekterna på Elasticitetsmodul från temperatur och luftfuktighet, vilkakorrelerar mot fuktmättnadsgraden i plasten. Det avsedda temperaturintervallet är-40◦C till 80◦C och 0% till 100% fuktmättnadsgrad. Dragprovstesterna gjordes genom bearbetning av existerande produkter följt av kon-ditionering till önskad fuktmättnadsgrad. Genom genomförandet av dragprov, såkunde Youngs modul bestämmas för ett antal kombinationer av temperaturer ochfukterhalter. Från denna data så kunde en polynomyta för Youngs modul approx-imeras. Konditioneringen av dragprovsbitarna kunde accelereras genom nedsänkningi upphettat vatten, vilket minskade konditioneringstiden till mindre än två dygn. Ap-proximeringen av funktionen för Youngs modul kunde göras genom polynomapprox-imering, vilket resulterade i en tredje ordnings polynom beroende på två variablernafuktmättnadsgrad och temperatur. En annan approximation gjordes för de nega-tiva temperaturerna, då enbart temperaturberoende beteende undersöktes med enkonstant fuktmättnadsgrad. För att säkerställa validiteten av modellen så gjordestre mätningar på varje testkombination ifrån vilket ett medel kalkylerades. Den ap-proximerade funktionen jämfördes sedan med värdena från datablad för en viss fukt-mättnadsgrad och temperatur. Från den resulterande ytapproximationen av Youngsmodul för de positiva temperaturerna, så kan slutsatsen att PA66GF25 är avsevärtmycket mer påverkad av fukt än temperatur dras. Detta är tydligare för de testernamed låga fuktmättnadsgrader då ökningen av Youngs modul är exponentiell medanden är mer linjär för högre fuktmättnadsgrad. Den maximala och minimala Youngsmodul visade sig vara 8 GPa och 2.7 GPa respektive. De negativa temperaturernasapproximation var begränsad till en fuktmättnadsgrad och därmed resulterade i engraf kring 5 GPa. Beteendet hos denna graf var troligtvis ett resultat från isen imaterialet vars beteende är snarlikt en studie på isens mekaniska egenskaper visadepå.

Purpose: The purpose of this thesis is to investigate how food start-ups (FS) can make their primary food packaging (PFP) more eco-friendly by identifying and evaluating the performance of suited packaging alternative. The purpose was fulfilled by answering the three research questions:  RQ1) How to assess the eco-friendliness of PFP? RQ2) Which are areas of improvement in environmental performance? RQ3) What are the differences in performance across similar PFP’s?  Methods: To answer the research questions both the literature review and empirical data was required. The literature study was conducted to gather relevant theories about primary food packaging in food start-ups. To get the required empirical data, a single case study was conducted at a case company that suited the subject. The case study consisted of multiple interviews and document study. This enabled for an analysis in the form of pattern matching in order to answer the research questions and achieve the purpose.  Findings: The Study found that to assess the PFP that have direct impact on the environment the functional features and the environmental framework play a central role in the eco- friendliness of PFPs which analyzed the requirements for the PFP and a multi criteria decision making approach for the environmental assessment for the Green-PE. The stakeholder expectations were found by analyzing the criterion for the PFP. In addition, a comparison for an eco-friendlier alternative was analyzed with the current Green-PE to justify the performance for the PFP in FS.  Implications: The study results present practical implications with assessing the current Green-PE and evaluating the gaps for improvement areas, while also comparing similar PFP which is an eco-friendlier option for food packaging start-ups. As there has been no general theoretical implications, the findings of the thesis can be used as a basis for deeper insights into the subject through more extensive research.  Delimitations & Scope: The focus was to identify and evaluate the current PFP environmental impact and not the other aspects of the life cycle assessment since the scope was limited. Also, a single case study was used rather than multiple case studies to analyze the eco-friendliness for PEPs.

Idag är de vanligaste använda raketerna flytande-bränsle- och fast-bränsle- raketer. Flytande-bränsle-raketer har fördelen att det kan manövreras men de har en komplex design och problem med förvaring. Fast-bränsle-raketer har en enkel design och kan förvaras men de har en miljöpåverkan och bränslet kan vara svårhanterligt. En tredje typ av raketer, hybridraketer, kan kombinera enkelheten från fasta-bränsle-raketer med manövreringsbarheten från vätske-bränsle-raketer. Trots fördelarna med hybridraketer används de inte på grund av att bränslet har låg regressionshastighet och låg densitet. Organiska additiv har visat sig förbättra dessa egenskaper. 50 organiska additiv granskades med avseende på deras specifika impuls, densitet, kostnad och användarvänlighet. De mest lovande organiska additiven utvärderades sedan experimentellt. Termogravimetrisk analys (TGA), isotermviktförlust, kompatibilitet och differentiell svepkalorimetri (DSC) användes. Resultaten indikerar att hexamin, fluorene, anthracene och 1,4-dicyanobenzene har mest potential att förbättra bränslet i hybridraketer. / Liquid propellant and solid propellant rockets are the most commonly used rockets Liquid propellant rockets have the advantage of being manoeuvrable with a high specific performance while they exhibit problems with storage and a complex design. Solid propellant rockets offer simplicity and are storable while they have a large environmental impact and could be difficult to handle. A third type of rocket, hybrid propellant rocket has the potential to combine the simplicity of solid propellant rocket with the manoeuvrability of liquid propellant rockets. While the hybrid propellant rocket offers advantages over liquid propellant and solid propellant rocket it have problems with its fuel which have a low regression rate and low density. Organic fillers were evaluated since they may increase in the regression rate and the density of the solid fuel. 50 organic fillers were assessed with regards to their specific impulse, density, cost and handling properties. The organic fillers with the most promising properties were then experimentally evaluated. Thermogravimetric analysis (TGA), isothermal weight loss test, compatibility test and differential scanning calorimetry analysis were conducted. The results indicate that hexamine, fluorene, anthracene and 1,4-dicyanobenzene are the most suitable organic fillers of those evaluated..