芳纶短纤维/芳纶浆粕增强制备高性能氯丁橡胶复合材料

对芳纶短纤维和芳纶浆粕进行微观结构表征和热失重分析，系统地研究了芳纶短纤维和芳纶浆粕对橡胶复合材料基本物理性能、动态力学性能和动刚度的影响。结果表明，芳纶短纤维为巨原纤模型；芳纶浆粕为微纤模型，呈羽绒状。芳纶短纤维在500 ℃降解，650 ℃左右降解基本完全；芳纶浆粕在350 ℃左右开始降解，500 ℃左右迅速降解，直到650 ℃左右降解基本完全。芳纶短纤维/芳纶浆粕增强制备的氯丁橡胶复合材料的撕裂强度、拉断伸长率、屈挠性能随着芳纶短纤维/芳纶浆粕并用比值减小而提高，但其动刚度减小。动态力学性能表明芳纶短纤维与芳纶浆粕并用比为10:10时，有相对较高的储能模量，较低的损耗模量和损耗因子,动态疲劳性能较好。

Effect of aramidshort fiber and aramid pulp on the structure and properties of rubber composites

In this paper, the microstructure characterization and thermal weight loss analysis of aramid short fiber and aramid pulp were carried out. The effects of aramid short fiber/aramid pulp on the basic physical properties, dynamic mechanical properties and dynamic stiffness of the rubber composites were systematically studied. The results show that, aramid fiber has a giant fibrous model, and Kevlar pulp has microfiber model. The degradation of aramid staple fibers at 500 ℃ was basically complete at about 650 ℃. The aramid pulp was degraded at about 350 ℃ and degraded quickly at about 500 ℃, and the degradation was basically complete at about 650 ℃. The smaller the ratio of aramid short fiber/aramid pulp is, the greater the tear strength and elongation, the better the flexural properties of the rubber composite, but the smaller the dynamic stiffness. The dynamic mechanical properties show that when the ratio of aramid fiber and aramid pulp is 10:10, it has relatively higher storage modulus, lower loss modulus and loss factor, and better dynamic fatigue performance.