关键词: 芳纶浆粕, 复合材料, 芳纶短纤维, 动刚度

Abstract:

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.

Key words: aramid short fiber, composites, aramid pulp, dynamic stiffness