轶纶聚酰亚胺纤维的耐化学性能研究

Research on the chemical resistance of Yilun polyimide fiber

为了了解轶纶聚酰亚胺纤维耐化学腐蚀性能,测试经不同浓度、不同温度化学试剂处理后的纤维的拉伸断裂性能及处理前后纤维表面形态和化学结构的变化情况。结果表明:轶纶纤维可溶解于浓度为98%的浓硫酸,但轶纶纤维对低浓度的硫酸的耐受性较好,即使温度达到100℃,强度仍可保持原强度的65%以上;轶纶纤维经热的浓盐酸处理后,仍能保持原强度的40%以上,断裂强度损失率随盐酸浓度的增加而增大;轶纶纤维对低浓度碱溶液的耐受性较好,在高浓度的碱溶液中强度损失严重;轶纶纤维在低温条件下受强氧化剂的影响较小,在高温条件下纤维强度损失率增加;经化学试剂处理后的纤维表面出现刻蚀现象,但不同处理条件下纤维表面被刻蚀程度;通过对处理前后轶纶纤维的红外光谱分析发现,纤维各特征峰的位置基本无变化,但强度有所减弱。

In order to understand the chemical corrosion resistance properties of the Yilun polyimide fiber,testing the tensile performance in different concentrations and temperature of chemical reagents,and surface morphology and chemical structure changes before and after treatment.The results showed that：Yilun fiber can be dissolved in concentrated of98% slufuric acid,but it had good tolerance on low concentration slufuric acid,even if the temperature reached 100℃,the strength still maintain more than 65% of the original strength.Yilun fiber can maintain more than 40% of original strength by treatment with high concentration hydrochloric acid,and breaking strength loss rate increased with the increasing concentration of hydrochloric acid.Yilun fiber had good tolerance on low concentration of alkali solution,but strength loss steious in a high concentration of alkali solution.Yilun fiber was small by the strong oxidizer under the condition of low temperature,the strength of fiber loss rate increased under high temperature conditions.The fiber surface etching phenomenon by chemical treatment,but the degree of the surface was etched under different processing conditions.By infrared analysis,the characteristic peak position of fibers did not change after treating in dilute acid and alkali,but the strength was weakened.