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采用TG、DSC和万能材料试验机对聚酰亚胺纤维浸胶复丝拉伸性测试方法进行了研究。考察了不同测试条件下,聚酰亚胺纤维拉伸强度、表观拉伸弹性模量和断裂伸长率的变化规律。研究结果表明,聚酰亚胺纤维的拉伸性能样品制备条件有很大关系,影响因素包括含胶量、固化张力和胶液种类。含胶量低于40%时,纤维力学性能比正常值低。制样时施加适当的固化张力可得到较高的拉伸性能。对比环氧E51和E44两种树脂两种固化体系,采用E51的拉伸强度和断裂伸长率更大。加载速率低于80mm/min时,其对拉伸性能几乎没有影响。
The tensile testing method of polyimide fiber dipped multifilament was studied by TG, DSC and universal material testing machine. The changes of tensile strength, apparent tensile modulus and elongation at break of polyimide fibers under different test conditions were investigated. The results show that the tensile properties of polyimide fibers have great influence on the preparation conditions of the samples. The influencing factors include the amount of adhesive, the curing tension and the type of glue. When the content of gel is less than 40%, the mechanical property of fiber is lower than normal. Sample preparation of appropriate curing tension can be higher tensile properties. Comparing two kinds of epoxy E51 and E44 two curing systems, the use of E51 tensile strength and elongation at break greater. At loading rates below 80 mm / min, it has almost no effect on the tensile properties.