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多环氧扩链剂对聚乙醇酸流变行为、结晶及力学性能的影响

Influence of a Multiple Epoxy Chain Extender on the Rheological Behavior, Crystallization, and Mechanical Properties of Polyglycolic Acid.

作者信息

Gao Jianfeng, Wang Kai, Xu Nai, Li Luyao, Ma Zhao, Zhang Yipeng, Xiang Kun, Pang Sujuan, Pan Lisha, Li Tan

机构信息

School of Materials Science and Engineering, Hainan University, Haikou 570228, China.

School of Science, Hainan University, Haikou 570228, China.

出版信息

Polymers (Basel). 2023 Jun 21;15(13):2764. doi: 10.3390/polym15132764.

DOI:10.3390/polym15132764
PMID:37447410
原文链接:https://pmc.ncbi.nlm.nih.gov/articles/PMC10346693/
Abstract

This study investigated the impact of a multiple epoxy chain extender (ADR) on the rheological behavior, crystallization, and mechanical properties of polyglycolic acid (PGA). Tests of the torque and melt mass flow rate and dynamic rheological analysis were conducted to study the rheological behavior of PGA modified with ADR. The rheological results of the modified PGA showed a significantly increased viscosity and storage modulus with an increase in the ADR amount, which could be attributed to the chain extension/branching reactions between PGA and ADR. It was proved that ADR could be used as an efficient chain extender for tailoring the rheological performance of PGA. The Han plot of the modified PGA showed a transition of viscous behavior to elastic behavior, while the ADR content was increased from 0 to 0.9 phr. The formation of long-chain branches (LCBs) was confirmed via the Cole-Cole plot and weighted relaxation spectrum, wherein the LCBs substantially changed the rheological behavior of the modified PGA. The vGP plots predicted a star-type topological structure for the LCBs. The results of non-isothermal crystallization kinetics suggested that the crystallization of the modified PGA was predominantly homogeneous nucleation and three-dimensional growth. The crystallinity decreased slightly with the increase in the ADR amount. Compared to neat PGA, the modified PGA samples exhibited better tensile and flexural performances.

摘要

本研究考察了多环氧扩链剂（ADR）对聚乙醇酸（PGA）流变行为、结晶行为及力学性能的影响。通过测试扭矩和熔体质量流动速率以及进行动态流变分析，研究了用ADR改性的PGA的流变行为。改性PGA的流变结果表明，随着ADR用量的增加，粘度和储能模量显著提高，这可归因于PGA与ADR之间的扩链/支化反应。结果证明，ADR可作为一种有效的扩链剂来调控PGA的流变性能。改性PGA的Han图表明，随着ADR含量从0增加到0.9 phr，粘性行为向弹性行为转变。通过Cole-Cole图和加权松弛谱证实了长链支化（LCB）的形成，其中LCB显著改变了改性PGA的流变行为。vGP图预测了LCB的星形拓扑结构。非等温结晶动力学结果表明，改性PGA的结晶主要为均相成核和三维生长。结晶度随ADR用量的增加略有降低。与纯PGA相比，改性PGA样品表现出更好的拉伸和弯曲性能。

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