作者：Linyao Zhou, Guiyan Zhao, Jinghua Yin, Wei Jiang
关键字：生物降解聚合物, 脆韧转变, 冲击韧性, 模量, 增塑
论文来源：期刊
具体来源：e-Polymers, 2014, 14(4), 283-288
发表时间：2014年

摘要：制备了含不同含量增塑剂碳酸丙烯酯（PC）的聚3-羟基丁酸酯（PHB）/聚碳酸丙烯酯（PPC）共混物，并研究了共混物韧性随温度的变化。结果表明，随着PC含量增加，PPC增韧PHB的脆韧转变温度（TBD）由60°C降至10°C。进一步考察了PC含量对增塑PPC力学性能的影响，以及TBD与PHB基体模量E1和增塑PPC弹性体模量E2之比的关系：要在较低温度下获得韧性良好的PHB/增塑PPC共混物，增塑PPC的模量应显著低于PHB基体。此外，分散粒子形态对韧性也有重要影响，当增塑剂含量超过20 wt%时，PPC粒子更趋球形且尺寸更小，韧性随之明显提高。

Abstract：Poly(3-hydroxybutyrate) (PHB)/poly(propylene carbonate) (PPC) blends containing various amounts of plasticizer propylene carbonate (PC) were prepared, and the toughness of the blends as a function of temperature was studied. The brittle-ductile transition temperature (TBD) of PHB toughened by PPC decreased from 60°C to 10°C with the increase in PC content. The relationship between TBD and the ratio of the Young's modulus (E1) of the PHB matrix to that of the plasticized PPC elastomer (E2) was investigated. The Young's modulus of plasticized PPC should be considerably lower than that of the PHB matrix in order to obtain tough PHB/plasticized PPC blends at a lower temperature. When the plasticizer content was more than 20 wt.%, the PPC particles became more spherical and smaller, and the toughness could be considerably improved accordingly.

论文链接：https://doi.org/10.1515/epoly-2013-0069