混杂短纤维增强尼龙1010的热水老化

本文研究了经80℃热水老化2600小时的短碳纤维和玻璃纤维混杂增强尼龙1010复合材料的性能与结构变化,并对复合材料中的纤维长度分布进行了统计.研究表明,纤维长度减小主要发生在挤出造粒阶段.碳纤维与玻璃纤维的长度分布差异不大.混杂增强的尼龙1010复合材料在许多力学性能和摩擦磨损行为上表现出正的“混杂效应”.热水老化后仍然存在这种情况.热水老化使尼龙1010的分子量降解,降解率随玻璃纤维含量增加而增大.老化使尼龙1010晶粒增大,但并无形成球晶.热水老化后复合材料的力学性能保留率随玻璃纤维含量增加而下降.热水老化使玻璃纤维与尼龙1010之间的界面粘结受到严重破坏,界面剪切强度严重下降.碳纤维与尼龙的界面粘结所受的破坏轻一些.

EFFECTS OF HOT WATER IMMERSION ON HYBRID SHORT FIBER REINFORCED NYLON 1010

This paper deals with the structure and properties of short carbon fiber and glass fiber hybrid reinforced Nylon 1010 composites before and after water immersion at 80℃ for 2600 hours.The fibers incoperated in composites were separated and the length of them was measured one by one and then the length distribution was calcufated.The results show that the fibers were shortened considerably during the extrusion process.There is no appreciable difference in the length distribution between carbon fiber and glass fiber.A positive(synergetic) "hybrid effect" can be observed on the mechanical behavior and friction and wear properties of these composites either before and after hot water immersion.Degradation of molecular weight of Nylon 1010 occurs during the hot water immersion and the molecular weight retention decreases with increasing the Volume fraction of glass fiber.The crystallites grew larger during the immersion,however no spherulites can be observed.The retention of mechanical properties of these composites decreases with the increase of Volume fraction of glass fiber.The interfacial adhesion between glass fiber and Nylon 1010 matrix suffers severe damage during hot water immersion and the interfacial shear strength decreases remarkably.However,the interface between carbon fiber and Nylon 1010 matrix remains well bonded after immersion.