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Article 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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| http://dx.doi.org/10.1016/j.ijbiomac.2025.143004 | DOI Listing |
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