采用湿法纺丝和热拉伸工艺制备了的高强度高模量的PVA/CNF/GO复合纤维,研究了纳米纤维素(CNF)和氧化石墨烯(GO)对聚乙烯醇(PVA)纤维的增强作用,探讨了CNF含量和热拉伸温度对纤维拉伸性能的影响。当CNF的含量为6%,GO的含量为1%时,湿法纺制的PVA/CNF/GO复合纤维在160 ℃经过3倍的热拉伸处理后具有优异的拉伸性能,其极限抗拉强度为1.09±0.11 GPa,弹性模量为21.87±3.03 GPa,比纯PVA纤维分别提高了45%和63%,比未热拉伸处理的PVA/CNF/GO复合纤维分别提高了523%和271%。同时,该复合纤维具有良好的生物相容性和潜在的生物应用价值,可作为手术缝合线,提供组织再生时所需的适当张力。

The high-strength and high-modulus PVA/CNF/GO composite fiber was prepared by wet spinning and hot drawing process. The reinforcement effect of Cellulose nanofibrils (CNF) and graphene oxide (GO) on polyvinyl alcohol (PVA) fiber was studied. The effects of CNF content and hot drawing temperature on the tensile properties of fibers were discussed. When the content of CNF is 6% and the content of GO is 1%, the PVA/CNF/GO composite fiber prepared by wet spinning has excellent tensile properties after three times of hot stretching treatment at 160 ℃. Its ultimate tensile strength and elastic modulus are 1.09±0.11 GPa and 21.87±3.03 GPa respectively, which are 45% and 63% higher than those of pure PVA fiber, and 523% and 271% higher than those of PVA/CNF/GO composite fiber without hot stretching treatment. Meanwhile, the composite fiber has good biocompatibility and potential biological application value, which can be used as surgical sutures to provide appropriate tension for tissue regeneration.

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