This study reports an innovative environmental friendly polyacrylonitrile (PAN) fiber grafting modification method, which is using L-cysteine as a coupling agent to link the hydrolyzed PAN fibers with protein macromolecules by covalent bonds. After hydrolysis of PAN fibers, protein grafting was carried out after cysteine treatment. This method could improve the grafting efficiency of grafted polyacrylonitrile fiber without producing toxic by-products to human body and environment. The structure and surface appearance of the grafted fibers were characterized by FTIR, SEM, XRD and XPS. It was proved that the protein was successfully grafted onto the surface of acrylic fibers. The grafted fibers also showed improved mechanical properties and good hygroscopicity.

中文翻译：

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L-半胱氨酸偶联蛋白对聚丙烯腈纤维的表面改性方法

这项研究报告了一种创新的环保聚丙烯腈（PAN）纤维接枝改性方法，该方法使用L-半胱氨酸作为偶联剂，通过共价键将水解后的PAN纤维与蛋白质大分子连接起来。PAN纤维水解后，在半胱氨酸处理后进行蛋白质接枝。该方法可以提高接枝聚丙烯腈纤维的接枝效率，而不会对人体和环境产生有毒的副产物。用FTIR，SEM，XRD和XPS对接枝纤维的结构和表面形貌进行了表征。证明该蛋白成功地接枝到丙烯酸纤维的表面上。接枝纤维还显示出改善的机械性能和良好的吸湿性。