中空度对中空酚醛纤维性能的影响

摘要

Hollow phenolic fibers with different hollowness were prepared by controlling thickness of the partially-crosslinking spun filament derived from melt-spinning of the phenolic resin. Section morphology, mechanical properties, high temperature properties and thermal insulation of hollow phenolic fibers with different hollowness were charactered by SEM, fiber strength tester, TG-DSC and thermal insulation tester. The results show that shell thickness, apparent mechanical properties, degradation temperature and char yield decrease, mechanical properties change little and thermal insulation increases quickly with the degree of hollowness increase.%利用酚醛树脂纤维在固化中的皮芯效应,控制表皮固化层的交联厚度,用溶剂溶出未交联的芯部,制备出一系列不同中空度的中空酚醛纤维.分别采用SEM、电子纤维强力仪、TG-DSC、自制隔热效果测试仪对不同中空度中空酚醛纤维的截面形貌、力学性能、高温性能和隔热性能进行了考察.结果表明:随着中空酚醛纤维中空度的增加,中空纤维的壁厚变薄,纤维的表观力学性能、热分解温度和残炭率都逐渐降低,实际抗拉强度变化不大,隔热性能大幅提高.