A vasta gama de sistemas poliméricos classificados como blendas tem sido alvo crescente no meio acadêmico e científico. A possibilidade de obtenção de propriedades combinadas e múltiplas, associada a incorporações de blendas poliméricas, enriquece a condição de pesquisa abrindo assim uma extensa área de atuação. Neste trabalho foi proposto o estudo de mistura de composto de poli (cloreto de vinila) plastificado com resíduo de poli (vinil butiral), proveniente de laminados para produção de para-brisas da indústria automotiva, bem como a investigação do efeito da irradiação gama com dose absorvida de 25 kGy, 30 kGy e 40 kGy, controlado com uso de dosímetro de PMMA e taxa de dose equivalente de 0-10 kGy.h-1. Foram analisadas variações das propriedades mecânicas e térmicas das amostras antes e após exposição à radiação gama. As formulações foram constituídas em diferentes concentrações: composto de PVC-C, resíduo de PVB-R, PVC-C/PVB-R 90/10, PVC-C/PVB-R 50/50 e PVC-R/PVB-R 50/50. O composto de poli (cloreto de vinila) foi formulado e aditivado, apresentando comportamento de um elastômero termoplástico, produto flexível. Foram incorporadas aparas moídas de poli (vinil butiral), provenientes de laminados para produção de para-brisas. Ambos os materiais foram incorporados em extrusora granuladora tipo rosca simples e submetidos ao processo de calandragem para efetivação da mistura e formação de mantas plásticas. As mantas foram irradiadas em um reator multipropósito de 60Co e caracterizadas para verificação das propriedades mecânicas e térmicas. Para tanto, as blendas após exposição à radiação gama apresentaram propriedades mecânicas e térmicas intermediarias as propriedades dos seus componentes, mostrando-se um material resistente e de baixo custo. Por meio da microscopia eletrônica de varredura obteve uma redução nos vasos interfaciais mostrando um aumento na capacidade de percolação do PVB na matriz de PVC, favorecendo suas propriedades físicas. / The wide range of polymer systems classified as blends has been increasingly targeted in the academic and scientific milieu. The possibility of obtaining multiple and combined properties, combined with the incorporation of polymer blends, enriches the research condition, thus opening up an extensive area of performance. In this work the study of the poly (vinyl butyral) plasticized polyvinyl chloride mixture from laminates for automotive windshield production was investigated, as well as the investigation of the effect of gamma irradiation with absorbed dose of 25 kGy, 30 kGy and 40 kGy, controlled with use of PMMA dosimeter and equivalent dose rate of 0-10 kGy.h-1. Variations of the mechanical and thermal properties of the samples were analyzed before and after exposure to gamma radiation. The formulations were constituted in different concentrations: PVC-C compound, PVB-R residue, PVC-C/PVB-R 90/10, PVC-C/PVB-R 50/50 and PVC-R/PVB-R 50/50. The polyvinyl chloride compound was formulated and added, exhibiting the behavior of a thermoplastic elastomer, a flexible product. Poly (vinyl butyral) ground chips were produced from laminates for the production of windshields. Both materials were incorporated in a single-thread granulator extruder and submitted to the calendering process to effect the mixing and formation of plastic blankets. The blankets were irradiated in a 60Co multipurpose reactor and characterized for verification of mechanical and thermal properties. In order to do so, the blends after exposure to gamma radiation presented mechanical properties and intermediate thermal properties of their components, showing a resistant material and low cost. By means of the scanning electron microscopy it obtained a reduction in the interfacial vessels showing an increase in the percolation capacity of the PVB in the PVC matrix, favoring its physical properties.

A vasta gama de sistemas poliméricos classificados como blendas tem sido alvo crescente no meio acadêmico e científico. A possibilidade de obtenção de propriedades combinadas e múltiplas, associada a incorporações de blendas poliméricas, enriquece a condição de pesquisa abrindo assim uma extensa área de atuação. Neste trabalho foi proposto o estudo de mistura de composto de poli (cloreto de vinila) plastificado com resíduo de poli (vinil butiral), proveniente de laminados para produção de para-brisas da indústria automotiva, bem como a investigação do efeito da irradiação gama com dose absorvida de 25 kGy, 30 kGy e 40 kGy, controlado com uso de dosímetro de PMMA e taxa de dose equivalente de 0-10 kGy.h-1. Foram analisadas variações das propriedades mecânicas e térmicas das amostras antes e após exposição à radiação gama. As formulações foram constituídas em diferentes concentrações: composto de PVC-C, resíduo de PVB-R, PVC-C/PVB-R 90/10, PVC-C/PVB-R 50/50 e PVC-R/PVB-R 50/50. O composto de poli (cloreto de vinila) foi formulado e aditivado, apresentando comportamento de um elastômero termoplástico, produto flexível. Foram incorporadas aparas moídas de poli (vinil butiral), provenientes de laminados para produção de para-brisas. Ambos os materiais foram incorporados em extrusora granuladora tipo rosca simples e submetidos ao processo de calandragem para efetivação da mistura e formação de mantas plásticas. As mantas foram irradiadas em um reator multipropósito de 60Co e caracterizadas para verificação das propriedades mecânicas e térmicas. Para tanto, as blendas após exposição à radiação gama apresentaram propriedades mecânicas e térmicas intermediarias as propriedades dos seus componentes, mostrando-se um material resistente e de baixo custo. Por meio da microscopia eletrônica de varredura obteve uma redução nos vasos interfaciais mostrando um aumento na capacidade de percolação do PVB na matriz de PVC, favorecendo suas propriedades físicas. / The wide range of polymer systems classified as blends has been increasingly targeted in the academic and scientific milieu. The possibility of obtaining multiple and combined properties, combined with the incorporation of polymer blends, enriches the research condition, thus opening up an extensive area of performance. In this work the study of the poly (vinyl butyral) plasticized polyvinyl chloride mixture from laminates for automotive windshield production was investigated, as well as the investigation of the effect of gamma irradiation with absorbed dose of 25 kGy, 30 kGy and 40 kGy, controlled with use of PMMA dosimeter and equivalent dose rate of 0-10 kGy.h-1. Variations of the mechanical and thermal properties of the samples were analyzed before and after exposure to gamma radiation. The formulations were constituted in different concentrations: PVC-C compound, PVB-R residue, PVC-C/PVB-R 90/10, PVC-C/PVB-R 50/50 and PVC-R/PVB-R 50/50. The polyvinyl chloride compound was formulated and added, exhibiting the behavior of a thermoplastic elastomer, a flexible product. Poly (vinyl butyral) ground chips were produced from laminates for the production of windshields. Both materials were incorporated in a single-thread granulator extruder and submitted to the calendering process to effect the mixing and formation of plastic blankets. The blankets were irradiated in a 60Co multipurpose reactor and characterized for verification of mechanical and thermal properties. In order to do so, the blends after exposure to gamma radiation presented mechanical properties and intermediate thermal properties of their components, showing a resistant material and low cost. By means of the scanning electron microscopy it obtained a reduction in the interfacial vessels showing an increase in the percolation capacity of the PVB in the PVC matrix, favoring its physical properties.

Nos travaux sont consacrés à la fabrication, à la mise en œuvre et aux caractérisations de mélanges de polymères thermoplastiques thermostables destinés à des applications aéronautiques hautes températures. Le Poly(éther cétone cétone) PEKK, polymère semi-cristallin, a été choisi pour sa température de transition vitreuse (Tg) et son point de fusion (Tf) élevés. Les polyimides amorphes utilisés pour leur Tg élevée, sont le Poly(éther imide) PEI et le (polyimide) PI. Le but de ces mélanges est d’augmenter la Tg du PEKK, sans augmenter sa température de fusion. Ces travaux ont abouti à la caractérisation thermique, mécanique et rhéologique de chacun des polymères purs ainsi qu’à la définition d’un protocole de fabrication des mélanges. Les propriétés des mélanges ont alors été caractérisées par analyses thermomécaniques, par balayage calorimétrique différentiel et par des essais de traction afin de faire ressortir les meilleurs candidats pour les applications visées. Les modèles empiriques classiques de variation de la Tg prennent en compte seulement la composition des mélanges. Dans ce travail, nous proposons de corriger ceux-ci par la prise en compte de la variation du taux de cristallinité qui influe sur la composition de la phase amorphe et ainsi permettre une prévision plus fine de ce paramètre. La tenue au vieillissement à court terme des différents polymères dans un fluide aéronautique a aussi été abordée, et a montré que le PEKK a un effet protecteur sur les mélanges. / This PhD work presents the fabrication, processing and characterizations of thermoplastic thermostable polymer blends. It aims at finding new materials useable at high temperatures for aeronautical applications. Poly(ether ketone ketone), PEKK, a semi-crystalline polymer, has been chosen for its high glass transition temperature (Tg) and high melting point (Tf). Amorphous polyimides, that have been used for their high Tg, are Poly(ether imide), PEI, and Polyimide, PI. The aim of these blends is to increase the Tg of the PEKK without increasing its Tf. We have measured the thermal, mechanical and rheological properties of each neat polymer and the processing conditions of the blends have been defined. The properties of the blends have been characterized by thermomechanical analyses, differential scanning calorimetry and tensile tests to focus on the better candidates for the aimed applications. The classical empirical models of the Tg composition dependence take only into account the blends composition. We propose to correct them taking into account the crystallinity level, that affects the blends composition and predict a better prediction of the Tg . The short term ageing of these polymer blends specimens in a commonly used aeronautic fluid has also been studied, and showed the protection effect of the PEKK polymer in the blends.

Neste estudo foram avaliadas amostras de misturas poliméricas de Policarbonato (PC) e Poli--caprolactona (PCL) em diferentes concentrações após enterro em solo preparado, por períodos variando de uma a doze semanas, seguindo a Norma ASTM G 160 - 03. As amostras, após ficarem enterradas, foram retiradas do solo e analisadas por calorimetria diferencial de varredura (DSC), análise termogravimétrica (TGA), microscopia ótica (MO), microscopia eletrônica de varredura (MEV) e espectrometria de absorção na região do infravermelho com transformada de Fourier (FTIR). Foi observado através de avaliação morfológica que houve degradação nas amostras de PCL puro e na mistura PC/PCL (60/40). Para misturas com menores teores de PCL a degradação não foi significativa no tempo de avaliação sugerido pela norma. Após o tempo de 12 semanas em contato com o solo houve uma redução no teor de cristalinidade das amostras tanto de PCL puro quanto da mistura PC/PCL com 40% de PCL. As variações ocorridas devido à biodegradabilidade não foram suficientes para acarretar perda de resistência térmica nas amostras. Verificou-se que para avaliar a biodegradabilidade de misturas contendo o polímero biodegradável PCL, é necessária uma adaptação da Norma utilizada, aumentando o tempo de enterro das amostras / In this study samples of polycarbonate (PC) and poly(- caprolactone (PCL) blends were evaluated in different concentrations after being buried under simulation soil condition, for periods varying from one to twelve weeks, following ASTM G 160 03 methodology. The samples, after being buried, were removed from the soil and analyzed by differential scanning calorimetry (DSC), termogravimetric analysis (TGA), optical microscopy (OM), scanning electron microscopy (SEM) and Fourier transform infrared spectroscopy (FTIR). It was observed by morphological evaluation that pure PCL and PC/PCL (60/40) blend have suffered degradation. Blends with lower content of PCL did not shown significant degradation during the period of time suggested at the ASTM methodology. After 12 weeks in contact with soil, pure PCL and PC/PCL blend with 40% of PCL, had a decrease in crystalinity content. The variations in the samples due to biodegradability have not been enough to cause loss of thermal resistance in any of the tested samples. It was verified that to evaluate biodegradability of blends containing biodegradable polymer PCL, it is necessary an adaptation of the ASTM methodology, increasing the time of samples burial

<p>The sun provides us daily with large quantities of energy in the form of light. With the world’s increasing demand of electrical energy the prospect of converting this solar light into electricity is highly tempting. In the strive towards mass-production and low cost solar cells, new types of solar cells are being developed, e.g. solar cells completely based on organic molecules and polymers. These materials offer a promising potential of low cost and large scale manufacturing and have the additional advantage that they can be produced on flexible and light weight substrate which opens for new and innovating application areas, e.g. integration with paper or textiles, or as building materials. In polymer solar cells a combination of two materials are used, an electron donor and an electron acceptor. The three dimensional distribution of the donor and acceptor in the active layer of the device, i.e. the morphology, is known to have larger influence of the solar cell performance. For the optimal morphology there is a trade-off between sometimes conflicting criteria for the various steps of the energy conversion process. The dissociation of photogenerated excitons takes place at an interface between the donor and acceptor materials. Therefore an efficient generation of charges requires a large interface between the two components. However, for charge transport and collection at the electrodes, continuous pathways for the charges to the electrodes are required.</p><p>In this thesis, results from morphology studies by atomic force microscopy (AFM) and dynamic secondary ion mass spectrometry (SIMS) of spin-coated blend and bilayer thin films of polyfluorene co-polymers, especially poly[(9,9-dioctylfluorenyl-2,7-diyl)-co-5,5-(4´,7´-di-2-thienyl-2´,1´,3´-benzothiadiazole)] APFO-3, and the fullerene derivative [6,6]-phenyl-C61-butyric acid methyl ester (PCBM) are presented. It is shown that by varying the blend ratio, the spin.-coating solvent, and/or the substrate, different morphologies can be obtained, e.g. diffuse bilayer structures, spontaneously formed multilayer structures and homogeneous blends. The connection between these different morphologies and the performance of solar cells is also analysed. The results indicate that nano-scale engineering of the morphology in the active layer may be an important factor in the optimization of the performance of polymer solar cells.</p>

The sun provides us daily with large quantities of energy in the form of light. With the world’s increasing demand of electrical energy the prospect of converting this solar light into electricity is highly tempting. In the strive towards mass-production and low cost solar cells, new types of solar cells are being developed, e.g. solar cells completely based on organic molecules and polymers. These materials offer a promising potential of low cost and large scale manufacturing and have the additional advantage that they can be produced on flexible and light weight substrate which opens for new and innovating application areas, e.g. integration with paper or textiles, or as building materials. In polymer solar cells a combination of two materials are used, an electron donor and an electron acceptor. The three dimensional distribution of the donor and acceptor in the active layer of the device, i.e. the morphology, is known to have larger influence of the solar cell performance. For the optimal morphology there is a trade-off between sometimes conflicting criteria for the various steps of the energy conversion process. The dissociation of photogenerated excitons takes place at an interface between the donor and acceptor materials. Therefore an efficient generation of charges requires a large interface between the two components. However, for charge transport and collection at the electrodes, continuous pathways for the charges to the electrodes are required. In this thesis, results from morphology studies by atomic force microscopy (AFM) and dynamic secondary ion mass spectrometry (SIMS) of spin-coated blend and bilayer thin films of polyfluorene co-polymers, especially poly[(9,9-dioctylfluorenyl-2,7-diyl)-co-5,5-(4´,7´-di-2-thienyl-2´,1´,3´-benzothiadiazole)] APFO-3, and the fullerene derivative [6,6]-phenyl-C61-butyric acid methyl ester (PCBM) are presented. It is shown that by varying the blend ratio, the spin.-coating solvent, and/or the substrate, different morphologies can be obtained, e.g. diffuse bilayer structures, spontaneously formed multilayer structures and homogeneous blends. The connection between these different morphologies and the performance of solar cells is also analysed. The results indicate that nano-scale engineering of the morphology in the active layer may be an important factor in the optimization of the performance of polymer solar cells.

The goal of the work is to study possibilities for the modification of interface in immiscible polymer blends, which determine to a large degree of the blend properties. For this purpose novel coupling agents (named SCA) containing 2-oxazoline, 2-oxazinone, and hydrosilane reactive sites have been prepared. In blends of amino- functional and carboxylic acid terminated polymers the oxazoline and oxazinone units of the SCA react selectively with one of the polymers and, therefore, the SCA should locate at the interface. The remaining hydrosilane sites can now be used for further modification, e.g. for crosslinking. In the thesis we discussed the effect of the SCA on the morphology and thermal and rheological properties of blends based on carboxylic acid terminated polystyrene (PS) and amino-terminated polyamide 12 (PA) or poly(methyl methacrylate) (PMMA). The morphology of the blends and the location of the SCA strongly depends on the processing conditions. The crosslinkability of the interface could be proven by changes in the solubility behavior of the blends.

Made available in DSpace on 2014-12-17T14:07:11Z (GMT). No. of bitstreams: 1 QueremAFA_DISSERT.pdf: 6927049 bytes, checksum: 5fbf755901320194b71aa9dc0dc0b657 (MD5) Previous issue date: 2013-06-07 / Studies indicate that a variation in the degree of crystallinity of the components of a polymer blend influences the mechanical properties. This variation can be obtained by subjecting the blend to heat treatments that lead to changes in the spherulitic structure. The aim of this work is to analyze the influence of different heat treatments on the variation of the degree of crystallinity and to establish a relationship between this variation and the mechanical behavior of poly(methyl methacrylate)/poly(ethylene terephthalate) recycled (PMMA / PETrec) with and without the use of compatibilizer agent poly(methyl methacrylate-al-glycidyl methacrylate-al-ethyl acrylate) (MMAGMA- EA). All compositions were subjected to two heat treatments. T1 heat treatment the samples were treated at 130 ? C for 30 minutes and cooled in air. In T2, the samples were treated at 230 ? C for 5 minutes and cooled to approximately -10 ? C. The variation of the degree of crystallinity was determined by the proportional relationship between crystallinity and density, with the density measured by pycnometry. The mechanical behavior was verified by tensile tests with and without the presence of notches and pre-cracks, and by method of fracture toughness in plane strain (KIC). We used the scanning electron microscopy (SEM) to analyze the fracture surface of the samples. The compositions subjected to heat treatment T1, in general, showed an increase in the degree of crystallinity in tensile strength and a tendency to decrease in toughness, while compositions undergoing treatment T2 showed that the opposite behavior. Therefore, this work showed that heat treatment can give a polymer blend further diversity of its properties, this being caused by changes in the crystal structure / Estudos apontam que uma varia??o no grau de cristalinidade dos componentes de uma blenda polim?rica influencia nas suas propriedades mec?nicas. Essa varia??o pode ser obtida pela submiss?o da blenda a tratamentos t?rmicos que levam a modifica??es da estrutura esferul?tica. O objetivo desse trabalho ? analisar a influ?ncia de diferentes tratamentos t?rmicos na varia??o do grau de cristalinidade e estabelecer uma rela??o entre essa varia??o e o comportamento mec?nico da blenda poli(metacrilato de metila)/poli(tereftalato de etileno) reciclado (PMMA/PETrec) com e sem o uso do agente compatibilizante interfacial poli(metacrilato de metila-almetacrilato de glicidila-al-acrilato de etila) (MMA-GMA-EA). Todas as composi??es foram submetidas a dois tratamentos t?rmicos. No tratamento t?rmico T1 as amostras foram tratadas a 130 ?C por 30 minutos e resfriadas ao ar. No tratamento T2 as amostras foram tratadas a 230 ?C por 5 minutos e resfriadas a aproximadamente 10 ?C. A varia??o do grau de cristalinidade foi verificada pela rela??o de proporcionalidade existente entre cristalinidade e densidade, sendo a densidade medida por picnometria. O comportamento mec?nico foi verificado por ensaios de tra??o, com e sem a presen?a de entalhes e pr?-trincas, e pelo m?todo da tenacidade ? fratura em estado plano de deforma??o (KIC). Utilizou-se a microscopia eletr?nica de varredura (MEV) para analisar a superf?cie de fratura das amostras. As composi??es submetidas ao tratamento t?rmico T1, de uma forma geral, mostraram aumento no grau de cristalinidade, na resist?ncia ? tra??o e uma tend?ncia ? redu??o na tenacidade ? fratura, enquanto que as composi??es submetidas ao tratamento T2 mostraram um comportamento oposto a esse. Portanto, este trabalho mostrou que um tratamento t?rmico pode conferir a uma blenda polim?rica uma diversidade ainda maior de suas propriedades, sendo essa ocasionada pelas mudan?as na estrutura cristalina

Orientador: Prof. Dr. Jean Jacques Bonvent / Dissertação (mestrado) - Universidade Federal do ABC, Programa de Pós-Graduação em Biotecnociência, 2015. / Arcaboucos polimericos sao de interesse crescente no campo da engenharia de tecidos. Alguns biopolimeros tais como PLLA -poli (acido latico) e PCL . poli(¿Ã- caprolactona) tem sido amplamente utilizados na composicao destes arcaboucos devido a sua biocompatibilidade, biodegradabilidade e baixa toxicidade. Alem disso, estes biomateriais precisam ter uma boa adesao celular e proliferacao para serem eficazes na reparacao de tecidos. A fim de evitar a invasao de microorganismos, durante o processo de cicatrizacao, e importante a incorporacao de um agente antimicrobiano, para servir como uma barreira protetora e prevenir a infeccao no local da lesao. Tres tipos de arcaboucos foram desenvolvidos a base de PLLA e PCL, e da blenda PCL/PLA - 50/50. A porosidade das membranas de biopolimero foi controlada pela incorporacao de particulas de cloreto de sodio com determinada faixa de tamanho, como agente porogenico, na solucao polimerica, a qual foi, em seguida, removido apos a evaporacao do solvente, por imersao da membrana para a agua para dissolver o sal. A tetraciclina tem sido incorporados a membrana como um agente antibiotico. A morfologia da membrana, estrutura molecular e incorporacao da tetraciclina foram analisados por microscopia eletronica de varredura (MEV), FTIR e microscopia de fluorescencia. A cinetica de libertacao do farmaco foi investigadam atraves da monitorizacao da concentracao de tetraciclina difundida em solucao de PBS (pH 7,4), por meio de espectroscopia de UV-VIS. Os dados experimentais mostraram que a uma porosidade de cerca de 69% foi obtida. A incorporacao de tetraciclina mostrou ser bastante eficaz e uniforme nos arcaboucos, contudo observa-se melhores resultados no caso de PCL puro. A cinetica de libertacao do farmaco e de primeira ordem para arcaboucos com PLA e PCL, puros. No entanto, no caso da blenda, o processo de libertacao do farmaco nao segue nenhum modelo cinetico estabelecido. Tais resultados sugerem que estes suportes de biopolimero podem ser eficazmente produzida com caracteristicas porosas e com a incorporacao de antibioticos, a fim de promover uma libertacao controlada da droga para o processo de reparo tecidual. / Polymeric scaffolds are of growing interest in the field of tissue engineering . Some biopolymers such as PLA - poly lactic acid and PCL - polycaprolactone have been widely used in the composition of these scaffolds due to their biocompatibility, biodegradability and low toxicity. In addition, these biomaterials need to have a good cell adhesion and proliferation to be effective in tissue repair. Furthermore, the formation of pores in the scaffolds is directly related to a better adhesion of material to the cells. In order to avoid microorganism invasion that during the healing process it is important to incorporate an antimicrobial such as tetracycline, to serve as a protective barrier and prevents infection at the site of the injury. Three types of scaffolds were develop, based on PCL, and their blend 50/50, by means of casting process. The porosity of the biopolymer membranes was controlled achieved by the incorporation of sodium chloride particles of given size, as a porogene agent, into the polymer solution, which was then removed after the solvent evaporation by immersion of the membrane into water to dissolve the salt. Tetracycline has been incorporated into to the membrane as an antibiotic agent. The membrane morphology, molecular structure e incorporation of the tetracycline were analyzed by Scanning Electron Microscopy (SEM), FTIR and Fluorescence Microscopy. The drug release kinetic was investigated by monitoring the concentration of tetracycline that diffused to a PBS solution (pH 7.4), by means of uv-vis spectroscopy. The experimental data showed that a medium porosity, of about 69%, could be reached. The incorporation of tetracycline was found to be quite effective and uniform into the scaffolds, tending to lead to better results in the case of pure PCL. The drug release kinetic is of first order for the pure PLA and PCL scaffold. Nevertheless, in the case of the blend, any of the usual kinetic model could describe the drug release process.Such results suggested these biopolymer scaffolds could be effectively produced with porous characteristics and with incorporation of antibiotics in order to promote a controlled drug liberation for wound healing process.

[pt] Blenda polimérica é a mistura física de dois ou mais polímeros, sem reação química intencional entre os componentes. O objetivo básico é combinar as melhores propriedades de cada componente da blenda que, consequentemente, terá propriedades intermediárias àquelas dos polímeros misturados. As maiores vantagens das blendas são a grande variedade e a versatilidade de suas aplicações, que, somadas à facilidade de processamento, possibilitam a produção dos mais diversos produtos, tornando-as competitivas em relação a outros materiais. Outra finalidade das blendas é otimizar a relação custo/benefício e melhorar a processabilidade de polímeros de alta temperatura. Os materiais utilizados neste trabalho foram o PEAD e a PA12, ambos os polímeros sendo de grande importância industrial. O objetivo do trabalho é produzir blendas poliméricas de PEAD/PA12, avaliar a sua miscibilidade e realizar ensaios para extrair suas propriedades. As blendas foram feitas em três composições: 75/25, 50/50 e 25/75 e foi feita a caracterização mecânica com ensaios de tração e fluência, química com análise FTIR e DRX, reológica e análise por MEV e os resultados foram usados para avaliar a combinação das propriedades dos polímeros puros nestas blendas. / [en] Polymer blend is the physical mixture of two or more polymers without any intentional chemical reaction between the components. The basic goal is to combine the best properties of each blend component that, consequently, will have intermediary properties to those of the polymers used. The biggest advantages of the blends are the great variety and the versatility on their applications that added to the good processability, make possible the production of many products making them competitive in relation to other materials. Another objective of the blends is to optimize the cost/benefit relation and improve the processability of high temperature polymers. The materials used on this work were the HDPE and the PA12, both polymers being of great industrial importance. The interest of this work is to produce HDPE/PA12 blends and evaluate their miscibility and make tests to know their properties. The blends were made in three compositions: 75/25, 50/50 and 25/75 and it was done the mechanical characterization with uniaxial tension and creep behavior, chemical characterization with FTIR analysis and x-ray diffraction, rheology and SEM analysis and the results were used to evaluate the combination of the properties of the neat polymers used in these blends.