Enhancing mechanical and heat-resistant properties of melt-spun ploy (lactic acid) fiber via crystal structure regulation: The synergistic effects of long-chain branching and drawing process

IF 8.5 1区化学 Q1 BIOCHEMISTRY & MOLECULAR BIOLOGY

International Journal of Biological Macromolecules Pub Date : 2025-04-12 DOI:10.1016/j.ijbiomac.2025.143004

Xiugang Zhang, Sheng Guo, Senlong Yu, Huanyao Zhang, Hengxue Xiang, Liping Zhu, Zhe Zhou, Meifang Zhu

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引用次数: 0

Abstract

The fabrication of ploy (lactic acid) (PLA) fiber with adjustable crystal structure and property still remains a great challenge. In this work, a series of melt-spun PLA fibers with increased strength and heat-resistance are prepared via crystal structure, which is caused by the synergistic effects of dicumyl peroxide (DCP) long-chain branching (LCB) modification and drawing process. The chemical structure of LCB-PLA resin is confirmed by the NMR and FTIR spectrum, which indicates that PLA is successfully modified by DCP free radical reaction through reactive extrusion. Moreover, the crystallization behavior and rheological property of PLA resin are significantly influenced by LCB degree. Especially, the PLA-LCB with 0.05 % DCP demonstrates the most ideal crystallinity and thermal stability owing to the micro crosslinking effect of DCP. Finally, the synergistic effects of LCB modification and drawing process on the crystal structure and property of PLA fiber are investigated by WAXD, SAXS, DMA and tensile testing. The tensile strength and glass transition temperature of LCB-PLA-0.05D fiber with 2.4 drawing ratio are increased to 3.25cN/dtex and 76.5 °C, respectively. Therefore, our work presents a feasible approach to fabricate enhanced strength and heat-resistance PLA fiber via crystal structure regulation, which has a bright future of industrialization.

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通过晶体结构调控提高熔融纺丝聚乳酸纤维的力学和耐热性能：长链支化和拉伸过程的协同效应

制备具有可调晶体结构和性能的聚乳酸（PLA）纤维仍然是一个巨大的挑战。本研究利用过氧化二氨基苯（DCP）长链支化（LCB）改性和拉伸工艺的协同作用，通过晶体结构制备了一系列增强强度和耐热性的熔融纺丝PLA纤维。通过核磁共振和红外光谱对LCB-PLA树脂的化学结构进行了验证，表明DCP自由基通过反应挤出对PLA进行了改性。此外，LCB度对聚乳酸树脂的结晶行为和流变性能有显著影响。特别是0.05% DCP的PLA-LCB，由于DCP的微交联作用，结晶度和热稳定性最理想。最后，通过WAXD、SAXS、DMA和拉伸试验研究了LCB改性和拉伸工艺对PLA纤维晶体结构和性能的协同效应。拉伸比为2.4的LCB-PLA-0.05D纤维的拉伸强度和玻璃化转变温度分别提高到3.25cN/dtex和76.5℃。因此，我们的工作为通过晶体结构调节来制备增强强度和耐热性的PLA纤维提供了一条可行的途径，具有良好的产业化前景。

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来源期刊

International Journal of Biological Macromolecules 生物-生化与分子生物学

CiteScore

13.70

自引率

9.80%

发文量

2728

审稿时长

64 days

期刊介绍： The International Journal of Biological Macromolecules is a well-established international journal dedicated to research on the chemical and biological aspects of natural macromolecules. Focusing on proteins, macromolecular carbohydrates, glycoproteins, proteoglycans, lignins, biological poly-acids, and nucleic acids, the journal presents the latest findings in molecular structure, properties, biological activities, interactions, modifications, and functional properties. Papers must offer new and novel insights, encompassing related model systems, structural conformational studies, theoretical developments, and analytical techniques. Each paper is required to primarily focus on at least one named biological macromolecule, reflected in the title, abstract, and text.