Supertoughened biodegradable poly(L-lactic acid) by multiphase blends system: Crystallization, rheological and mechanical properties

IF 3.1 2区化学 Q2 CHEMISTRY, ANALYTICAL

Thermochimica Acta Pub Date : 2024-07-02 DOI:10.1016/j.tca.2024.179810

Yujie Jin , Jing Guo , Hongda Cheng , Yi Li , Changyu Han

引用次数: 0

Abstract

To toughen brittle poly(L-lactic acid) (PLA), poly(3-hydroxybutyrate-co-3-hydroxyhexanoate) (PHBH) and poly(vinyl acetate) (PVAc) were introduced into PLA matrix to prepared PLA/PHBH/PVAc ternary blends. PVAc was electively located in PLA matrix and refined phase morphology owing to better miscibility of PVAc with PLA than with PHBH. Increase in PVAc content decreased the crystallization rate and the crystallinity of PLA due to the dilution effect. More importantly, prominent enhancement of flexibility and toughness of PLA was obtained by the addition of PHBH and PVAc. Elongation at the break and impact strength of ternary blend with 10 wt% PVAc were 277 % and 326 % higher than that of neat PLA. Melt viscoelasticity of PLA was improved by incorporation of PHBH and PVAc. The combination of increased toughness and high melt viscoelasticity established in PLA biodegradable blends represent properties required in a wider range of applications.

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多相共混体系超增韧可生物降解聚（L-乳酸）：结晶、流变和机械性能

为了增韧脆性聚乳酸（PLA），在聚乳酸基体中引入聚（3-羟基丁酸-3-羟基己酸酯）（PHBH）和聚（醋酸乙烯酯）（PVAc）以制备聚乳酸/PHBH/PVAc 三元共混物。由于 PVAc 与聚乳酸的混溶性优于与 PHBH 的混溶性，因此 PVAc 可选择性地位于聚乳酸基体中并完善相形态。由于稀释效应，PVAc 含量的增加降低了聚乳酸的结晶速率和结晶度。更重要的是，PHBH 和 PVAc 的加入显著提高了聚乳酸的柔韧性和韧性。含有 10 wt% PVAc 的三元共混物的断裂伸长率和冲击强度分别比纯聚乳酸高出 277% 和 326%。加入 PHBH 和 PVAc 后，聚乳酸的熔体粘弹性得到改善。聚乳酸可生物降解共混物所具有的高韧性和高熔体粘弹性结合在一起，代表了更广泛应用所需的特性。

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

Thermochimica Acta 化学-分析化学

CiteScore

6.50

自引率

8.60%

发文量

210

审稿时长

40 days

期刊介绍： Thermochimica Acta publishes original research contributions covering all aspects of thermoanalytical and calorimetric methods and their application to experimental chemistry, physics, biology and engineering. The journal aims to span the whole range from fundamental research to practical application. The journal focuses on the research that advances physical and analytical science of thermal phenomena. Therefore, the manuscripts are expected to provide important insights into the thermal phenomena studied or to propose significant improvements of analytical or computational techniques employed in thermal studies. Manuscripts that report the results of routine thermal measurements are not suitable for publication in Thermochimica Acta. The journal particularly welcomes papers from newly emerging areas as well as from the traditional strength areas: - New and improved instrumentation and methods - Thermal properties and behavior of materials - Kinetics of thermally stimulated processes

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