The effect of poly(D-lactide) on the properties of poly(butylene adipate-co-terephthalate)/poly(L-lactide) blends with stereocomplex crystallites formed in situ

IF 2.2 4区 化学 Q3 CHEMISTRY, PHYSICAL
Mengdie Yu, Hechang Shi, Yancun Yu, Hongda Cheng, Ye Zhang, Changyu Han
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Abstract

In order to overcome the drawback of poor mechanical and rheological properties and potentially extend the poly(butylene adipate-co-butylene terephthalate) (PBAT) application market, in this work, we developed PBAT blend with excellent comprehensive performance through blending with biodegradable poly(L-lactide) (PLLA) and poly(D-lactide) (PDLA). Two-step melt blending and constant polylactide (PLA) content were devised to prepared PBAT blend. The effect of PDLA on the crystallization properties, rheological properties, miscibility, morphological structure, and mechanical properties of blend was investigated. According to torque-time curve and DSC results, PLA stereocomplex (SC-PLA) crystallites were formed in blend system. DMA results confirmed that the compatibility between PBAT and PLLA was not changed when PDLA was introduced. SEM results showed that the phase morphology of PBAT/20PLLA/0PDLA blend displayed typical sea-island structure and the particle size of dispersed phase decreased accompanying by agglomeration when PDLA was added. Rheological results showed that percolation SC-PLA network structure had formed and a much denser crystallite network could be formed with high PDLA content, which significantly enhanced rheological properties of blend. The mechanical results demonstrated that the addition of PDLA could significantly enhance mechanical properties. The blend with 6 wt% PDLA presented yield strength, elongation at break, and modulus about 13.3 MPa, 307%, and 221.2 MPa, respectively, the yield strength and modulus increased by 141.7% and 54.7% compared with the pure PBAT.

Graphical abstract

Abstract Image

聚(D-内酯)对原位形成立体复合结晶的聚(己二酸丁二醇酯-共对苯二甲酸丁二醇酯)/聚(L-内酯)共混物性能的影响
为了克服聚己二酸丁二醇酯-对苯二甲酸丁二醇酯(PBAT)机械性能和流变性能差的缺点,扩大其应用市场,本研究通过与可生物降解的聚(L-内酯)(PLLA)和聚(D-内酯)(PDLA)共混,开发了综合性能优异的 PBAT 共混物。通过两步熔融混合和恒定的聚乳酸(PLA)含量来制备 PBAT 共混物。研究了 PDLA 对共混物结晶性能、流变性能、相溶性、形态结构和力学性能的影响。根据扭矩时间曲线和 DSC 结果,共混体系中形成了聚乳酸立体复合物(SC-PLA)结晶。DMA 结果证实,引入 PDLA 后,PBAT 与 PLLA 的相容性没有改变。扫描电镜结果表明,PBAT/20PLLA/0PDLA 共混物的相形态呈现出典型的海岛结构,加入 PDLA 后,分散相的粒径随团聚而减小。流变学结果表明,SC-PLA 网络结构已经形成,高 PDLA 含量可形成更致密的晶粒网络,从而显著提高共混物的流变学性能。力学结果表明,添加 PDLA 可显著提高力学性能。含有 6 wt% PDLA 的共混物的屈服强度、断裂伸长率和模量分别约为 13.3 MPa、307% 和 221.2 MPa,与纯 PBAT 相比,屈服强度和模量分别提高了 141.7% 和 54.7%。
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来源期刊
Colloid and Polymer Science
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.
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