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以L-半胱氨酸盐酸盐(L-CMHC)为改性试剂,对聚丙烯腈(PAN)纤维进行接枝改性,合成了一种新型含巯基纤维(cys-PAN)。探讨了反应温度、反应时间、L-CMHC的质量浓度、PAN纤维与L-CMHC的质量比等因素对纤维合成的影响,得出cys-PAN纤维的优化合成条件为:反应温度125～130℃、反应时间4.5h、L-CMHC的质量浓度0.04g/mL、PAN纤维与L-CMHC的质量比1∶0.5～1∶1。红外光谱、拉曼光谱等结构表征结果证明,巯基被成功接枝在PAN纤维骨架上;热失重分析结果表明,合成的纤维具有良好的热稳定性;间接碘量法测得优化条件下合成的cys-PAN纤维的巯基含量为1.56mmol/g。
A novel sulfhydryl-containing fiber (cys-PAN) was synthesized by graft modification of polyacrylonitrile (PAN) with L-cysteine hydrochloride (L-CMHC) The effects of reaction temperature, reaction time, mass concentration of L-CMHC and the mass ratio of PAN fiber to L-CMHC on the fiber synthesis were investigated. The optimum synthesis conditions of cys-PAN fiber were as follows: reaction temperature 125 ~ 130 ℃ , The reaction time 4.5h, the concentration of L-CMHC 0.04g / mL, the mass ratio of PAN fiber and L-CMHC 1: 0.5 ~ 1: 1. The results of FT-IR, Raman spectroscopy and other characterization proved that the thiol groups were successfully grafted onto the PAN fiber skeleton. The thermogravimetric analysis showed that the synthesized fibers had good thermal stability. The indirect iodometric method The sulfhydryl content of cys-PAN fibers was 1.56 mmol / g.