Abstract

In this study, the ethylene/methyl acrylate/glycidyl methacrylate (EGA) terpolymer was performed to improve the stereocomplexation and toughness of poly(L-lactic acid)/poly(D-lactic acid) (PLLA/PDLA). The effects of EGA presence on the competing formations and crystallization kinetics of homocrystallites (HCs) and stereocomplexes (SCs), phase morphology and mechanical properties of PLLA/PDLA blends were investigated. For non-isothermal melt crystallization, the degree of SC crystallinity of PLLA/PDLA blends increased after PLLA/PDLA blending with EGA. For both isothermal and non-isothermal cold crystallization, the crystallization rate of PLLA/PDLA blends increased as the mass fraction of EGA in the blends grew from 10% to 30%. The incorporation of EGA was observed to facilitate the HC-to-SC melt reorganization of PLLA/PDLA blends; moreover, a significant enhancement in the toughness of the PLLA/PDLA matrix was achieved by incorporating the EGA elastomer. When EGA was added to produce a blend containing 30 wt%, the blend’s impact strength increased from 6.0 (for PLLA/PDLA) to 44.9 kJ/m². Overall, this study provides effective guidance for achieving the melt-processability of PLLA/PDLA blends characterized by improved stereocomplexation ability and toughness.

摘要

在这项研究中，进行了乙烯/丙烯酸甲酯/甲基丙烯酸缩水甘油酯（EGA）三元共聚物的改进，以提高聚（L-乳酸）/聚（D-乳酸）（PLLA / PDLA）。研究了EGA的存在对PLLA / PDLA共混物的均相晶体（HCs）和立体复合物（SCs）的竞争形成和结晶动力学，相形态和力学性能的影响。对于非等温熔融结晶，PLLA / PDLA与EGA混合后，PLLA / PDLA混合物的SC结晶度增加。对于等温和非等温冷结晶，PLLA / PDLA共混物的结晶速率随着共混物中EGA的质量分数从10％增加到30％而增加。观察到EGA的掺入促进了PLLA / PDLA共混物从HC到SC的熔体重组。此外，通过掺入EGA弹性体，极大地提高了PLLA / PDLA基体的韧性。当加入EGA制成的混合物含量为30 wt％时，²。总体而言，这项研究为实现具有改善的立体络合能力和韧性的PLLA / PDLA共混物的熔融加工性提供了有效的指导。