Avaliação da biodegradabilidade de filmes de polihidroxibutirato com borracha natural

• Ano de defesa: 2014
• Autor(a) principal: Souza, Pricila Silva de
• Orientador(a): Leite, Marcia Christina Amorim Moreira
• Banca de defesa: Sousa, Ana Maria Furtado de , Silva, Luciana Portal da
• Tipo de documento: Dissertação
• Tipo de acesso: Acesso aberto
• Idioma: por
• Instituição de defesa: Universidade do Estado do Rio de Janeiro
• Programa de Pós-Graduação: Programa de Pós-Graduação em Química
• Departamento: Centro de Tecnologia e Ciências::Instituto de Química
• País: BR
• Palavras-chave em Português: Misturas poliméricas; biodegradabilidade; PHB; borracha natural
• Palavras-chave em Inglês: Polymer blends; biodegradability; PHB; natural rubber
• Área do conhecimento CNPq: CNPQ::CIENCIAS EXATAS E DA TERRA::QUIMICA::QUIMICA ORGANICA::POLIMEROS E COLOIDES
• Link de acesso: http://www.bdtd.uerj.br/handle/1/15772

Modernity requires versatile , sturdy materials , and for a long time plastic served this purpose. However , the accumulation of these materials to be discarded in the environment has become a problem Biodegradable polymers have emerged in this scenario as an alternative to avoid the accumulation of plastic waste in the environment . The polyhydroxybutyrate ( PHB ) is a class of biodegradable polymers , but it is costly and still has limited thermal properties . Natural rubber has excellent mechanical properties , aging resistance , flexibility and presents best value compared to synthetic rubbers . In this study, polymer mixtures of polyhydroxybutyrate (PHB ) and natural rubber latex in different concentrations were prepared by hot pressing . Tests of differential scanning calorimetry ( DSC ) , thermal gravimetric analysis ( TGA ) , infrared spectroscopy (FTIR ) , optical microscopy (OM ) and scanning electron microscopy (SEM ) were used to characterize and evaluate the properties of polymer blends . The PHB and blends with natural rubber were subjected to biodegradation test by simulated soil burial , according to ASTM G 160-03 , for a period ranging 2-17 weeks. At the end of each period were determined mass loss , the morphology of the specimens and the analysis of DSC , TGA and FTIR were performed . The blends showed lower thermal resistance than the PHB . In the biodegradability test , the mixtures were considered biodegradable according to ASTM G 160-03 and had reduced the percentage of crystallinity , and the content of natural rubber contributed to increase the rate of biodegradation. The SEM analysis confirmed the existence of consortia of microorganisms responsible for the biodegradation of PHB and the polymer blends