Abstract:

Blending poly(propylene carbonate) (PPC) with poly(adipate?butylene terephthalate) (PBAT) was involved in the preparation of PPC/PBAT composites. However, the limited compatibility between the two materials hinders the potential performance enhancement of PPC/PBAT composites. To improve the compatibility between PPC and PBAT, maleic anhydride (MA) as a polar monomer and 2,5-dimethyl-2,5-bis(tert-butyl peroxy) hexane (DHBP) as an initiator were chosen for grafting onto PBAT to produce copolymer grafted Maleic anhydride (PBAT-g-MA).The interplay between PPC and PBAT-g-MA, as well as its impact on the properties of the blend, was thoroughly examined. The elongation at break of the blend was found to gradually increase with higher mass fraction of PBAT-g-MA. The elongation at break of PPC/PBAT-g-MA blends increased from 21.2% to 68.1%（60 and 40 are the quality scores of PPC and PBAT-g-MA, respectively）. Studies have shown that when the PBAT-g-MA content is lower than that of PPC, PBAT-g-MA functions as a uniformly dispersed phase within the PPC matrix. The anhydride group present in the material can effectively react with the end groups of PPC, thereby significantly enhancing compatibility between both phases and promoting stress transfer at interface layers to improve the mechanical properties of blends.

Key words: Poly(propylene carbonate), Poly(butylene adipate-co-terephthalate), Graft, Compatibility

摘要：

采用聚碳酸亚丙酯（PPC）与聚己二酸-对苯二甲酸丁二醇酯（PBAT）共混制备了PPC/PBAT复合材料。由于PPC与PBAT的相容性较差，限制了复合材料的性能提升。为了提高二者的相容性，选择极性单体马来酸酐（MA）及引发剂2,5-二甲基-2,5?双（叔丁基过氧）己烷（DHBP），对PBAT进行接枝改性，并制备了PBAT接枝马来酸酐（PBAT-g-MA）。研究了PPC与PBAT-g-MA之间的相互作用以及对共混物性能的影响。结果表明，随着PBAT-g-MA质量分数的增大，共混物的断裂伸长率逐渐增大，PPC-60/PBAT-g-MA-40（60、40分别为PPC、PBAT-g-MA的质量分数）的断裂伸长率由21.2%增大至68.1%；当PBAT?g?MA质量分数低于PPC时，作为分散相的PBAT-g-MA在PPC基体中均匀分散，自身的酸酐基团与PPC的端基发生反应，可有效改善两相的相容性，应力在界面层实现有效传递，共混物的力学性能得到提升。

关键词: 聚碳酸亚丙酯, 聚己二酸-对苯二甲酸丁二醇酯, 接枝改性, 相容性