论文部分内容阅读
Kevlar纤维是美国杜邦公司在六十年代开发的一种新型芳香族聚酰胺纤维,1972年投入生产。 Kevlar纤维的主要性能如下: 1.优良的力学性能。Kevlar纤维具有极高的强度和模量。据报道,Kevlar-29和Kevlar-49的强度分别达到了24.9克/旦和29.8克/旦,最高达32-40克/旦;模量达550-1000克/旦,最高达1400克/旦。而在Kevlar纤维问世以前,合成纤维的强度只达到10克/旦,模量只达到200克/旦的水平。由于Kevlar纤维比重较小(在1.44左右),因而其比强度极高,相当于钢丝的6-7倍。这就可以大大减轻增强制品的重量。由于模
Kevlar fiber is a new type of aramid fiber developed by DuPont in the 1960s and put into production in 1972. The main properties of Kevlar fibers are as follows: 1. Excellent mechanical properties. Kevlar fibers have extremely high strength and modulus. It has been reported that the strengths of Kevlar-29 and Kevlar-49 reach 24.9 g / d and 29.8 g / d respectively, up to 32-40 g / d and the modulus reaches 550-1000 g / d and up to 1400 g / d . Prior to the advent of Kevlar fibers, the strength of the synthetic fibers reached only 10 g / d and the modulus reached only 200 g / d. Due to the smaller specific gravity of Kevlar fibers (around 1.44), their specific strength is very high, equivalent to 6-7 times the wire. This can greatly reduce the weight of the product. Due to the mold