Effects of Catalytic Transesterification and Composition on the Toughness of Poly(lactic acid)/Poly(propylene carbonate) Blends
作者：Linyao Zhou, Guiyan Zhao, Wei Jiang
关键字：聚乳酸, 聚碳酸丙烯酯, 催化酯交换, 韧性, 四丁基钛酸酯
论文来源：期刊
具体来源：Industrial & Engineering Chemistry Research, 2016, 55(19), 5565-5573
发表时间：2016年
摘要：将聚乳酸（PLA）和马来酸酐封端的聚碳酸丙烯酯（PPC-MA）在有或无酯交换催化剂四丁基钛酸酯（TBT）条件下进行熔融共混。凝胶渗透色谱（GPC）、动态力学分析（DMA）和差示扫描量热（DSC）结果表明，TBT的加入促进了酯交换反应，且酯交换程度随TBT含量增加而提高。扫描电镜照片显示，PLA/PPC-MA/TBT在拉伸应力下可发生深度塑性拉伸。此外，PPC-MA在催化酯交换中比PLA更活跃，PPC-MA的质量分数对共混物力学性能有明显影响。当PPC-MA含量高于50 wt%时，TBT的加入显著提高了PLA/PPC-MA共混物的拉伸韧性。
Abstract：Poly(lactic acid) (PLA) and maleic acid anhydride end-capped poly(propylene carbonate) (PPC-MA) were melt blended with or without transesterification catalyst tetrabutyl titanate (TBT). The gel permeation chromatography (GPC), dynamic mechanical analysis (DMA) and differential scanning calorimetry (DSC) results indicated that the addition of TBT promoted the transesterification and the transesterification degree increased with increasing TBT content. The scanning electron microscope (SEM) photographs showed that the PLA/PPC-MA/TBT could be plastic stretched deeply under tensile stress. Moreover, PPC-MA was more active than PLA in the catalytic transesterification and the weight percent of PPC-MA had obvious effects on the mechanical properties of the blends. The tensile toughness of PLA/PPC-MA blends was significantly improved with the addition of TBT when the PPC-MA content was higher than 50 wt%.
论文链接：https://doi.org/10.1021/acs.iecr.6b00315