In this study, several types of modified methods were tried for improving natural fiber reinforced composites and also three kind of natural fibers were used for reinforced composite. Plasma polymerization increased fiber tensile and composites mechanical properties. It is higher effect than alkali treatment. Resin impregnation was expected cheaper method than plasma polymerization. Polyvinyl Alcohol resin impregnation method can increase fiber tensile strength, interfacial shear strength between fiber and composites mechanical properties. And with Bamboo/polypropylene/maleic anhydride polypropylene water absorption ratio also can decrease. / 博士(工学) / Doctor of Philosophy in Engineering / 同志社大学 / Doshisha University

The preparation of polymeric hybrid composite consisting of organic and inorganic fillers is of interest for industries like automotive, construction and packaging. In order to understand and predict the physical and chemical properties of these hybrid composites, it is necessary to fully understand the nature and properties of the employed fillers. In this study, the preparation of polypropylene hybrid composite consisting of wheat straw and clay was investigated. A detailed study was performed on wheat straw from South Western Ontario region. The effect of grinding the straw and compounding it with polypropylene was investigated. Experiments were carried out to identify the thermal stability of the ground wheat straw with respect to their size and composition. It was important to identify a correlation between these properties in order to minimize the straw degradation by processing and also to improve the final properties of the hybrid composite. The composite samples were prepared through melt blending method using a co-rotating twin-screw extruder. Sample test bars were prepared by injection moulding. The composition of the constituents of the hybrid composite; percentages of wheat straw, clay and coupling agent, were varied in order to investigate their influence on thermal stability, water resistance and mechanical properties. The results of the study indicated that grinding the wheat straw with a hammer mill produced particles with different sizes and shapes. It was found that through the grinding system all particles, regardless of their size, had a multi-layered structure similar to the plant structure. Further hammer milling did not produce plant particles with long aspect ratios that would be expected in a defibrillation process. Analysis of the chemical composition of wheat straw particles of different sizes and shapes was used to measure the ratio of hemicelluloses: lignin and the ash content. It was found that the large particles contained more amount of lignin whereas smaller particles had larger amount of ash content. The thermal stability of the particles was found to be a function of particle size rather than the lignin content. Particle size analysis on the wheat straw particles after the extrusion process indicated a reduction in the particle length and aspect ratio. The thermal stability of the composites was found to be enhanced by the addition of clay particles at higher temperature and the addition of coupling agent at lower temperatures. Increasing the amount of wheat straw and clay content increased the flexural modulus and reduced the resistance for water absorption. Increasing the amount of coupling agent also increased the flexural modulus and resistance for water absorption. The morphological study by scanning electron microscopy revealed that coupling agent increased the interfacial interaction between the particles and the polymer matrix.

The preparation of polymeric hybrid composite consisting of organic and inorganic fillers is of interest for industries like automotive, construction and packaging. In order to understand and predict the physical and chemical properties of these hybrid composites, it is necessary to fully understand the nature and properties of the employed fillers. In this study, the preparation of polypropylene hybrid composite consisting of wheat straw and clay was investigated. A detailed study was performed on wheat straw from South Western Ontario region. The effect of grinding the straw and compounding it with polypropylene was investigated. Experiments were carried out to identify the thermal stability of the ground wheat straw with respect to their size and composition. It was important to identify a correlation between these properties in order to minimize the straw degradation by processing and also to improve the final properties of the hybrid composite. The composite samples were prepared through melt blending method using a co-rotating twin-screw extruder. Sample test bars were prepared by injection moulding. The composition of the constituents of the hybrid composite; percentages of wheat straw, clay and coupling agent, were varied in order to investigate their influence on thermal stability, water resistance and mechanical properties. The results of the study indicated that grinding the wheat straw with a hammer mill produced particles with different sizes and shapes. It was found that through the grinding system all particles, regardless of their size, had a multi-layered structure similar to the plant structure. Further hammer milling did not produce plant particles with long aspect ratios that would be expected in a defibrillation process. Analysis of the chemical composition of wheat straw particles of different sizes and shapes was used to measure the ratio of hemicelluloses: lignin and the ash content. It was found that the large particles contained more amount of lignin whereas smaller particles had larger amount of ash content. The thermal stability of the particles was found to be a function of particle size rather than the lignin content. Particle size analysis on the wheat straw particles after the extrusion process indicated a reduction in the particle length and aspect ratio. The thermal stability of the composites was found to be enhanced by the addition of clay particles at higher temperature and the addition of coupling agent at lower temperatures. Increasing the amount of wheat straw and clay content increased the flexural modulus and reduced the resistance for water absorption. Increasing the amount of coupling agent also increased the flexural modulus and resistance for water absorption. The morphological study by scanning electron microscopy revealed that coupling agent increased the interfacial interaction between the particles and the polymer matrix.

Das Forschungsvorhaben liefert einen Beitrag zum Schweißen von Gleich- und Mischmaterialverbindungen aus Naturfaserverstärkten Kunststoffen (NFK) sowie deren Verarbeitung im Compoundieren und Spritzguss. Es wurde holzfasergefülltes (WPC) und flachsfasergefülltes (FFC) Polypropylen (PP) mit unterschiedlichen Füllgraden verwendet. Der Einsatz synthetisch-organsicher Fasern (PET-Fasern) im Compound zielte darauf ab, besonders die Schlagzähigkeit zu verbessern. Im Bereich des Urformens wurden Aussagen zur Verarbeitbarkeit, zu rezepturabhängigen Kurz- und Langzeiteigenschaften sowie Aussagen zur Dauergebrauchsfähigkeit erarbeitet. Die Anwendbarkeit der Fügeverfahren Heizelement- (HE-Schweißen) und Vibrationsschweißen (VIB-Schweißen) konnte für Gleich- und Mischmaterialverbindungen sowohl ohne als auch mit angepasster Energieeinbringung nachgewiesen werden. In diesem Zusammenhang können Aussagen zur Rezepturabhängigkeit, Verfahrensführung, Parameterauswahl, Prüfkriterien sowie den technischen Grenzen der Schweißverbindung unter kurzzeitmechanischer Beanspruchung getroffen werden. Weiterhin wird ein Beitrag zur Dauergebrauchsfähigkeit unter UV-Globalbewitterung und thermischer Alterung sowie zu langzeitmechanischen Eigenschaften von NFK-Schweißverbindungen geliefert.

Denna studie undersöker för- och nackdelar med textilier gjorda av bananavfall applicerat inom modebranschen. Studien granskas ur ett miljöperspektiv med ett fokus utifrån mål 12: Hållbarkonsumtion och produktion från de Globala målen. De Globala målen är en del avhandlingsplanen Agenda 2030 som är uppsatt av United Nation Development Program, där det eftersträvas att fram till och med år 2030 ha uppnått en mer hållbar värld. Vidare kommer bananfiberns egenskaper att granskas ur ett teoretiskt perspektiv för att se om detta är ett lämpligt val inom modebranschen. Studien ger också en inblick i hur modebranschen i Sverige förhåller sig till textilt material av bananavfall. Studien utgör en viktig del för att sprida kunskap om bananfiberns för- och nackdelar medmöjligheter att ge bättre förutsättningar till modeindustrin att kunna använda en hållbar fiber. Studiens resultat visar att det finns möjligheter för att detta ska kunna uppnås i framtiden sett ur ett hållbarhetsperspektiv, samt utifrån bananfiberns egenskaper. / This thesis examines the advantages and disadvantages regarding textiles made out of bananawaste within the fashion industry. An environmental perspective is applied based on goal 12:Responsible consumption and production from the Sustainable Development Goals (SDGs).SDGs is a part of the 2030 Agenda set by United Nation Development Programs, which aims tocreate a better world by 2030. Furthermore, the characteristics of the banana fiber and itsadequacy for the fashion industry will be theoretically examined. An aspect regarding thematerial from the fashion industries point of view will also be processed. Only swedishcompanies are included in the thesis.The thesis constitutes an important part for disseminate knowledge regarding the advantages anddisadvantages of the banana fiber. This with an expectation to provide better conditions withinthe fashion industry using a more sustainable fiber. Based on the results of the thesis, theopportunities to achieve this in the future are significant, due to the fact that both an sustainableperspective and the characteristics of the banana fiber shows a positive outcome. Furthermore,the thesis indicates a split result regarding the fashion companies point of view in the matter.

Das Forschungsvorhaben liefert einen Beitrag zum Schweißen von Gleich- und Mischmaterialverbindungen aus Naturfaserverstärkten Kunststoffen (NFK) sowie deren Verarbeitung im Compoundieren und Spritzguss. Es wurde holzfasergefülltes (WPC) und flachsfasergefülltes (FFC) Polypropylen (PP) mit unterschiedlichen Füllgraden verwendet. Der Einsatz synthetisch-organsicher Fasern (PET-Fasern) im Compound zielte darauf ab, besonders die Schlagzähigkeit zu verbessern. Im Bereich des Urformens wurden Aussagen zur Verarbeitbarkeit, zu rezepturabhängigen Kurz- und Langzeiteigenschaften sowie Aussagen zur Dauergebrauchsfähigkeit erarbeitet. Die Anwendbarkeit der Fügeverfahren Heizelement- (HE-Schweißen) und Vibrationsschweißen (VIB-Schweißen) konnte für Gleich- und Mischmaterialverbindungen sowohl ohne als auch mit angepasster Energieeinbringung nachgewiesen werden. In diesem Zusammenhang können Aussagen zur Rezepturabhängigkeit, Verfahrensführung, Parameterauswahl, Prüfkriterien sowie den technischen Grenzen der Schweißverbindung unter kurzzeitmechanischer Beanspruchung getroffen werden. Weiterhin wird ein Beitrag zur Dauergebrauchsfähigkeit unter UV-Globalbewitterung und thermischer Alterung sowie zu langzeitmechanischen Eigenschaften von NFK-Schweißverbindungen geliefert.

Syftet med studien är att undersöka hur TencelTM och merinoull bäst kombineras i en stickad frottéstruktur ämnad för en lager-2 produkt. Den stickade strukturen har funktionella krav gällande god fukttransport, nötningsbeständighet och antipilling. Funktionskraven kommer att prövas med standardiserade tester. Ytterligare kommer studien undersöka om hållbarheten för lager-2-tyg skulle kunna förbättras. En design research method används för att skapa tre frottéstickade trikåstrukturer, alla med olika kombinationer av lyocell och merinoull. Resultaten visade att alla strukturer hade relativt goda förmåga att transportera fukt, dock stod S-M-T ut som bäst, tätt följt av T-M. Bra nötningsbeständighet utmärktes i M-T och T-M, medan S-M-T presterade sämst. Slutligen visade ett pillingstest ett jämnt resultat mellan alla stickade strukturer, T-M fick dock ett något högre snitt än de andra två. Resultaten i relation till hållbarhet visade att ingen av de stickade strukturerna var ensamt signifikant bättre än de andra. Däremot ger studien ett förslag för framtida forskning när det gäller att samspunna garnet placeras på ena sidan, medan merinoull på den andra. / This study aims to investigate how TencelTM and merino wool are best combined in a knitted terry structure modified for layer-2. The knitted structure has functional requirements, which are in regards to good moisture transport (wicking) capacity, abrasion resistances and anti-pilling. The functional requirements will be tested and with the help of the result the study will further investigate if the sustainability of layer-2 fabric could improve. A design research method is applied to create three terry knitted fabric structures, all with different combinations of lyocell and merino wool. The three fabric structures are then assets for the functional requirements through ISO Standards and AATCC tests. The results showed that all structures had relatively good wicking properties, however S-M-T stood out as the best, closely followed by T-M. Good abrasion resistance was noticeable mostly in M-T and T-M, whereas S-M-T performed worst. Lastly, a pilling test showed an even result between all knitted structures, T-M received however a slightly higher average than the other two. The results in relation to sustainability showed that none of the knitted structures were significantly better than the others alone. However, a suggestion for future research is made in regards to the co-spun yarn being placed on one side, while merino wool on the other.