Polybutylene terephthalate(PBAT)/polylactic acid(PLA)biodegradable composite were prepared by melt blending method with epoxy soybean oil(ESO)as compatibilizer.The infrared spectroscopy test results confirmed that the epoxy functional groups in ESO underwent compatibilization reactions with the carboxyl end groups of PBAT and PLA,forming PBAT-co-ESO-co-PLA,which improved the compatibility of the blends.The compatibilization effect caused the glass transition temperature of PBAT and PLA to approach each other,promoting the uniform dispersion of PLA in the matrix.The addition of ESO resulted in a decrease in the melting and crystallization temperatures of PBAT and PLA,and inhibited their crystallization behavior.Dynamic rheological testing showed that PBAT/PLA/MG blends had higher complex viscosity and modulus than PBAT and PBAT/PLA blends,indicating that the compatibilization reaction caused by ESO improved interface interaction and melting strength.Compared with PBAT/PLA,PBAT/PLA/ESO blends exhibited better stiffness and toughness balance.When the ESO content was 6％,the maximum fracture strain of the blend was 792％,and the fracture strength was 35.7 MPa,which was 2.1 times and 3.1 times that of PBAT/PLA respectively.
关键词
聚对苯二甲酸-己二酸丁二醇酯/聚乳酸/环氧大豆油/增容作用/结构与性能
Key words
PBAT/PLA/epoxy soybean oil/compatibilization effect/structure and performance
维普
万方数据