ポリ乳酸/ポリブチレンサクシネートポリマーブレンドフィルムの分解特性

概要

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In the present study, degradation properties of the polymer blends films of Poly (lactic acid) (PLA) and Poly (butylene succinate) (PBSU) with different mixed fractions were investigated. Immersion tests in phosphate buffered solution were conducted on the polymer blend films. After 0, 8, 16 and 24 weeks immersion, tensile tests and viscosity averaged molecular weight measurements were performed to evaluate the relation between mechanical properties and degradation. Tensile strength of PLA/PBSU 100/0, 80/20 50/50 decreased after 24 weeks immersion. Molecular weight of pure PLA and PBSU decreased with immersion. Degradation rate of PBSU was larger than that of PLA. Autocatalytic reaction model was used to simulate molecular weight of pure PLA and PBSU. This model was also used to predict molecular weight to PLA/PBSU blends. It is clarified that the model can predict the tendency of molecular weight change in PLA/PBSU polymer blends.
2010-11-25