Efeitos do calor e da ação microbiana em filmes de PHBV / PP-co-PE aditivados em solo

• Autor(a) principal: Borges, Bárbara Rani [UNESP]
• Data de Publicação: 2014
• Tipo de documento: Dissertação
• Idioma: por
• Título da fonte: Repositório Institucional da UNESP
• Texto Completo: http://hdl.handle.net/11449/108737
• topic: Biodegradation; Biodegradação; Polimeros; Biorremediação; Solos

Biodegradable synthetic polymers blends are a promising for the application of polymeric materials, aiming a faster degradation in the environment, even the amount of plastic waste is significantly increased over the last decade. This subject needs much further research on the response of these blends to different treatments to their degradation. The blends used in this study are biodegradable polymers such as poly (hydroxybutyrate-co-hydroxyvalerate) (PHBV) with a synthetic copolymer, the polypropylene-co-ethylene (PP-co-PE), in minor concentrations, with and without pro-oxidant additive. These blends films are prepared by melting in pressure-controlled press from pellets obtained previously in an internal mixer (torque rheometer), followed by cryogenic break, these films will be submitted to termotreatment at 100º C for 40 h and after to biotreatment in soil columns. The film analyzes will be made by Fourier transform infrared spectroscopy (FTIR), scanning electron microscopy (SEM) and growth test plate. The PHBV film, after the heat treatment, was completely biodegraded during 3 months in soil. The experimental period was not enough to the PP-co-PE films underwent biodegradation, although there has been microbial adhesion on their surface, after six months.The highest degradation rate of the no additive blend was after the thermal/biotreatment during 3 months, while the additive blends presented the highest degradation rate after 3 months buried in soil, without prior heat treatment. Therefore the additive influenced significantly the biodegradation process, in the absence of the heat pre treatment