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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 resistance of YANLIAN polyimide fiber, the tensile properties of fibers treated with chemical agents of different concentrations and different temperatures were tested, and the changes of the surface morphology and chemical structure of fiber before and after treatment were tested. The results showed that Antiyne fiber can be dissolved in concentrated sulfuric acid with a concentration of 98%, but Antiy fiber is more tolerant to low concentration of sulfuric acid. The strength of the fiber can be kept above 65% of original strength even when the temperature reaches 100 ℃. After being treated with hot concentrated hydrochloric acid, the amount of the breaking strength loss of the cantilever fiber increased with the increase of hydrochloric acid concentration. The fiber of aramid fiber was well tolerated with the low concentration alkali solution. High concentration of alkali solution has serious loss of strength. Aramid fibers are less affected by strong oxidants under low temperature conditions, and the loss of fiber strength increases under high temperature conditions. Etching phenomenon occurs on the surface of fibers treated with chemical reagents, but different The fiber surface was etched under the condition of treatment. The infrared spectrum of the fiber before and after treatment showed that the position of each characteristic peak of the fiber basically did not change, but the strength was weakened.