老挝黄金赌场大学项盛研究团队报道了L-聚乳酸/聚丙烯共混物的结晶行为：对L-聚乳酸和聚丙烯的加速作用。相关研究成果发表在2024年3月7日出版的国际知名学术期刊《中国高分子科学杂志》。

对于具有两种可结晶组分的聚合物/聚合物可分解混合物，不同组分的结晶行为以及不同晶体之间的相互影响是有趣和重要的，但没有进行详细研究。

该研究采用熔融混合法制备了不同重量比的L-聚乳酸/聚丙烯（PLLA/PP）共混物，并研究了共混物的结晶行为。结果表明，PLLA和PP的结晶结构不受组成的影响。对于PLLA的结晶，在PP晶体的存在下，链段的扩散和结晶速率都得到了提高。

对于PP的结晶，在无定形PLLA分子链的存在下，其结晶速率降低。当PP从PLLA晶体的存在中结晶时，尽管PLLA晶体降低了PP的扩散速率，但成核位置明显增强，加速了PP晶体的形成。

该研究将为PLLA/PP共混物的应用提供更多的基础数据。

附：英文原文

Title: The Crystallization Behavior of L-Poly(lactic acid)/Polypropylene Blends: The Acceleration for Both L-Poly(lactic acid) and Polypropylene

Author: Shuang-Cheng Li, Wei-Jia Zhou, Wen-Jie Wu, Jun Shao, Shui-Liang Chen, Hao-Qing Hou, Sheng Xiang

Issue&Volume: 2024-03-07

Abstract: For a polymer/polymer dismissible blend with two crystallizable components, the crystallization behavior of different components and the reciprocal influences between different crystals are interesting and important, but did not investigate in detail. In this study, the L-poly(lactic acid)/polypropylene (PLLA/PP) blends with different weight ratios were prepared by melt mixing and the crystallization behavior of the blends were investigated. Results showed that the crystalline structures of PLLA and PP were not altered by the composition. For the crystallization of PLLA, both the diffusion of chain segments and crystallization rate were enhanced under the existence of PP crystals. For the crystallization of PP, its crystallization rate was depressed under the existence of amorphous PLLA molecular chains. When the PP crystallized from the existence of PLLA crystals, although the diffusion rate of PP was reduced by PLLA crystals, the nucleation positions were obviously enhanced, which accelerated the formation of PP crystals. This investigation would supply more basic data for the application of PLLA/PP blend.

DOI: 10.1007/s10118-024-3104-x

Source: https://www.cjps.org/en/article/doi/10.1007/s10118-024-3104-x/