Crystallization Properties, Heat Resistance, and Hydrolytic Resistance of Poly(L-lactide)/Poly(D-lactide) Blend Enhanced by In situ Formation of Stereocomplex Polylactide

IF 4 2区化学 Q2 POLYMER SCIENCE

Chinese Journal of Polymer Science Pub Date : 2025-07-18 DOI:10.1007/s10118-025-3385-8

De-Yu Wei, Ni Chen, Zi-Wen Yin, Yan-Bo Li, Gao-Fei Zheng, Jun-Jia Bian, Hong-Wei Pan, Guo-Qiang Wang, Li-Ting He, Yan Zhao, Hui-Liang Zhang

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引用次数: 0

Abstract

Herein, the effect of in situ formation of the stereocomplex polylactide (sc-PLA) on the crystallization behaviors of poly(L-lactide)/poly(D-lactide) (PLLA/PDLA) blends was assessed. When the melt-blending temperature of the PLLA/PDLA blend approached the melting temperature of sc-PLA (approximately 220 °C), a higher relative content of sc-PLA was achieved. Additionally, the relative content of sc-PLA in the PLLA/PDLA blend increased progressively with the increase in PDLA content. Differential scanning calorimetry analysis revealed that the overall crystallization rate of the homocrystal polylactide were enhanced by the presence of sc-PLA. After crystallization at the same temperature (115 and 120 °C), the PLLA/PDLA blends exhibited a shorter half-crystallization time compared to PLLA alone. The size of the microcrystals of PLLA decreased as the sc-PLA content increased. Furthermore, the storage modulus and complex viscosity of the PLLA/PDLA blend increased with higher sc-PLA content. Dynamic mechanical analysis indicated that the glass transition temperature of PLLA in the PLLA/PDLA blends increased with increasing sc-PLA content. Additionally, the Vicat softening temperature increased from 67.8 °C for PLLA alone to 164.7 °C for the PLLA/25PDLA blend, enhancing the heat resistance of the PLLA/PDLA blends. Compared to PLLA alone, the hydrolytic resistance of the PLLA/PDLA blends showed marked improvement.

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原位形成立体络合物增强聚l -丙交酯/聚d -丙交酯共混物的结晶性能、耐热性和耐水解性

本文研究了原位形成立体配合物聚乳酸（sc-PLA）对聚l -丙交酯/聚d -丙交酯（PLLA/PDLA）共混物结晶行为的影响。当PLLA/PDLA共混物的熔融共混温度接近sc-PLA的熔融温度（约220℃）时，sc-PLA的相对含量较高。PLLA/PDLA共混物中sc-PLA的相对含量随着PDLA含量的增加而逐渐增加。差示扫描量热分析表明，sc-PLA的存在提高了均晶聚乳酸的整体结晶速率。在相同温度（115°C和120°C）下结晶后，PLLA/PDLA共混物的半结晶时间比单独的PLLA短。随着sc-PLA含量的增加，PLLA微晶尺寸减小。此外，随着sc-PLA含量的增加，PLLA/PDLA共混物的存储模量和复合粘度增加。动态力学分析表明，随着sc-PLA含量的增加，PLLA/PDLA共混体系中PLLA的玻璃化转变温度升高。此外，PLLA/25PDLA共混物的维卡软化温度从67.8℃提高到164.7℃，增强了PLLA/PDLA共混物的耐热性。与单独的PLLA相比，PLLA/PDLA共混物的耐水解性能有明显提高。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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来源期刊

Chinese Journal of Polymer Science 化学-高分子科学

CiteScore

7.10

自引率

11.60%

发文量

218

审稿时长

6.0 months

期刊介绍： Chinese Journal of Polymer Science (CJPS) is a monthly journal published in English and sponsored by the Chinese Chemical Society and the Institute of Chemistry, Chinese Academy of Sciences. CJPS is edited by a distinguished Editorial Board headed by Professor Qi-Feng Zhou and supported by an International Advisory Board in which many famous active polymer scientists all over the world are included. The journal was first published in 1983 under the title Polymer Communications and has the current name since 1985. CJPS is a peer-reviewed journal dedicated to the timely publication of original research ideas and results in the field of polymer science. The issues may carry regular papers, rapid communications and notes as well as feature articles. As a leading polymer journal in China published in English, CJPS reflects the new achievements obtained in various laboratories of China, CJPS also includes papers submitted by scientists of different countries and regions outside of China, reflecting the international nature of the journal.