Para-aramid Fiber

para-aramid fiber introduction

The conjugation effect of the benzene ring and amide group determines the excellent properties of para-aramid fiber with high strength, high modulus, and low density. Its density is only 1/5 of that of steel wire, but its tensile strength is 5-6 times that of steel wire, and its toughness is 2 times that of steel wire; It has excellent thermal stability, dimensional stability, chemical resistance, insulation, fatigue resistance, and does not decompose and melt below 560℃. It is currently recognized as a high-performance fiber material with high strategic value in the industry.

Molecular hydrogen bond

The molecular structure of the para-aramid fiber is a straight chain rigid structure, and its amide bond and benzene ring group form a π - π conjugate structure. The internal rotation potential is very high, the degree of orientation and crystallinity is high, and the chain segments are arranged neatly. It has two remarkable characteristics:

•The molecular chain is arranged by benzene ring and amide group according to certain rules, which has good regularity;

•The rigid linear molecular bonds bonded to the aromatic ring are highly oriented in the fiber axis, and the polymer chains are laterally connected by hydrogen bonds.