Enhanced rheological, crystallization, mechanical, and heat resistance performance of poly(L-lactide)/basalt fibers composites via in situ formation of stereocomplex polylactide crystals

IF 2.7 3区 化学 Q2 POLYMER SCIENCE Journal of Applied Polymer Science Pub Date : 2024-09-16 DOI:10.1002/app.56280
Hongda Cheng, Lijuan Wang, Changyu Han
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Abstract

Due to its favorable mechanical strength, transparency, and biocompatibility, polylactic acid (PLA) has considerable potential as a biodegradable material. Nevertheless, developing high-performance PLA composites through environmentally friendly and cost-effective methods remains a significant challenge. In this study, the composites comprising poly(L-lactide) (PLLA), basalt fibers (BFs), and poly(D-lactide) (PDLA) are prepared through facile melt blending. The in situ formed stereocomplex polylactide (SC-PLA) crystals improve the crystallization ability and rheological behavior of PLLA/BF/PDLA composites. Upon adding 5 wt% PDLA, BFs are nicely dispersed in PLLA matrix because of increased shear intensity. The synergistic effect of BFs and SC-PLA crystals enhances the mechanical, thermomechanical, and heat resistance properties of PLLA. In particular, PLLA/BF/10%PDLA composites exhibit a Vicat Softening Temperature (VST) of 155.5°C, increasing by approximately 100°C over neat PLLA. Annealing treatment increases the Young's modulus, thermomechanical properties, and VST of samples while reducing their tensile strength. Interestingly, the tensile strength of the annealed PLLA/BF/10%PDLA composites is 50.2 MPa, twice that of the annealed neat PLLA due to the introduction of SC-PLA crystals. Simultaneously improving the rheological, mechanical, and heat resistance performance of PLLA opens possibilities for expanding its potential applications in the industrial field.

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通过原位形成立体复合聚乳酸晶体提高聚(L-乳酸)/钴纤维复合材料的流变、结晶、机械和耐热性能
由于具有良好的机械强度、透明度和生物相容性,聚乳酸(PLA)作为一种可生物降解材料具有相当大的潜力。然而,通过环境友好且具有成本效益的方法开发高性能聚乳酸复合材料仍是一项重大挑战。本研究通过简便的熔融混合方法制备了由聚(L-乳酸)(PLLA)、玄武岩纤维(BFs)和聚(D-乳酸)(PDLA)组成的复合材料。原位形成的立体共聚聚乳酸(SC-PLA)晶体改善了 PLLA/BF/PDLA 复合材料的结晶能力和流变行为。加入 5 wt% 的 PDLA 后,由于剪切强度增加,BF 在 PLLA 基体中分散良好。BFs 和 SC-PLA 晶体的协同作用增强了 PLLA 的机械、热机械和耐热性能。特别是,PLLA/BF/10%PDLA 复合材料的维卡软化温度(VST)为 155.5°C,比纯 PLLA 提高了约 100°C。退火处理提高了样品的杨氏模量、热机械性能和 VST,同时降低了拉伸强度。有趣的是,由于引入了 SC-PLA 晶体,退火后的 PLLA/BF/10%PDLA 复合材料的拉伸强度为 50.2 兆帕,是退火后纯 PLLA 的两倍。同时改善聚乳酸的流变、机械和耐热性能,为扩大其在工业领域的潜在应用提供了可能性。
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来源期刊
Journal of Applied Polymer Science
Journal of Applied Polymer Science 化学-高分子科学
CiteScore
5.70
自引率
10.00%
发文量
1280
审稿时长
2.7 months
期刊介绍: The Journal of Applied Polymer Science is the largest peer-reviewed publication in polymers, #3 by total citations, and features results with real-world impact on membranes, polysaccharides, and much more.
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Editorial Board, Aims & Scope, Table of Contents Editorial Board, Aims & Scope, Table of Contents Editorial Board, Aims & Scope, Table of Contents Editorial Board, Aims & Scope, Table of Contents Cover Image, Volume 141, Issue 43
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