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以静电纺聚丙烯腈(PAN)纳米纤维为原料,与盐酸羟胺的水溶液反应,将腈基转化为偕胺肟基团,从而制备出偕胺肟基螯合纤维。探讨了盐酸羟胺浓度、pH值、反应时间及温度对转化率的影响,并分别采用扫描电子显微镜和傅里叶变换红外光谱(FT-IR)对PAN纳米纤维膜反应前后的形貌和分子基团进行分析。结果表明:PAN在pH值为7时,腈基转化率最高;-CN转化率随着浓度、反应时间及温度的增大而提高。红外光谱分析表明,PAN分子中有部分腈基转化为偕胺肟基团。
Electrospun polyacrylonitrile (PAN) nanofibers were used as raw materials to react with aqueous solution of hydroxylamine hydrochloride to convert nitrile groups to amidoxime groups to prepare amidoxime-based chelate fibers. The effects of hydroxylamine hydrochloride concentration, pH value, reaction time and temperature on the conversion were investigated. The morphology and molecular basis of PAN nanofibers before and after reaction were investigated by scanning electron microscopy and Fourier transform infrared spectroscopy (FT-IR) Mission analysis. The results showed that PAN had the highest nitrile conversion at pH 7; the conversion of -CN increased with the increase of concentration, reaction time and temperature. Infrared spectroscopy showed that some of the nitrile groups in the PAN molecule were converted to amidoxime groups.