The full name of para-aramid fiber is "polyparaphenylene terephthalamide" (PPTA) fiber, which is an organic polymer fiber synthesized by terephthaloyl chloride and p-phenylenediamine.
The bonds are connected at positions 1 and 4 of the two benzene rings, also known as aramid 1414.
Para-aramid has excellent properties such as high specific strength, high specific modulus, high temperature resistance and smoldering, and is known as the world's three major high-performance fibers together with carbon fiber and high-strength and high-modulus polyethylene.
PPTA is obtained by polycondensation at low temperature in N-methylpyrrolidone (NMP)-calcium chloride with p-phenylamine and p-phenyl-cyanide as monomers.
The main outstanding advantages of para-aramid are high strength and high modulus. Its tensile strength is 6 times that of steel wire, its tensile modulus is 2~3 times that of steel wire and glass fiber, and its density is only one-fifth of steel wire’s.It is mainly used for dry safety protection, bulletproof, rubber product reinforcement, high-strength cable and asbestos friction material replacement.