Preparation and characterization of PLA/PBAT blends toughened by poly(lactic acid-r-malic acid) copolymer

IF 2.2 4区化学 Q3 CHEMISTRY, PHYSICAL Colloid and Polymer Science Pub Date : 2024-04-26 DOI:10.1007/s00396-024-05252-z

Shujing Zhou, Haoyun Yu, Yao Li, Chenze Qi, Jinjing Li

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Abstract

PLA and PBAT blending is of great significance as biodegradable polymers with good properties. However, they are immiscible and form phase separation morphology in their blend; toughening is critical for the blend to obtain better mechanical properties. Copolymer of malic acid and l-lactide (PMLA) with long-chain branched topology is blended with PLA and PBAT, as to enhance the interfacial interactions for a toughened biodegradable polymer blend. The mechanical and thermal properties are investigated of the resultant blend. Together with SEM and positron annihilation lifetime spectroscopy analysis, the results show that PMLA is an efficient toughening agent for PLA and PBAT blend. The elongation at break increases more than sixfold and the impact strength increases 87.5% than neat PLA and PBAT blend with 8-to-2 weight fraction ratio. At the same time, the resultant blend still keeps fully biodegradable and shows promoted potential for broader application.

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聚乳酸-苹果酸共聚物增韧聚乳酸/PBAT 混合物的制备与表征

聚乳酸和 PBAT 作为生物可降解聚合物，具有良好的性能，两者的混合具有重要意义。然而，这两种聚合物互不相溶，在共混物中会形成相分离形态；要获得更好的机械性能，共混物的增韧至关重要。将具有长链支化拓扑结构的苹果酸和 l-内酰胺共聚物（PMLA）与聚乳酸和 PBAT 混合，以增强界面相互作用，从而获得增韧的生物可降解聚合物共混物。研究了混合物的机械性能和热性能。结合 SEM 和正电子湮灭寿命光谱分析，结果表明 PMLA 是聚乳酸和 PBAT 混合物的有效增韧剂。与纯聚乳酸和重量分数比为 8-2 的 PBAT 混合物相比，断裂伸长率提高了六倍多，冲击强度提高了 87.5%。同时，所得到的混合物仍可完全生物降解，具有更广泛的应用潜力。

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来源期刊

Colloid and Polymer Science 化学-高分子科学

CiteScore

4.60

自引率

4.20%

发文量

111

审稿时长

2.2 months

期刊介绍： Colloid and Polymer Science - a leading international journal of longstanding tradition - is devoted to colloid and polymer science and its interdisciplinary interactions. As such, it responds to a demand which has lost none of its actuality as revealed in the trends of contemporary materials science.