Structure and Properties of Heat-treated p-Aramid Fibers Containing Cyano Groups 


Vol. 56,  No. 4, pp. 242-247, Aug.  2019
10.12772/TSE.2019.56.242


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  Abstract

Poly(p-phenylene terephthalamide) (PPTA) and poly(2-cyano-1,4-phenylene terephthalamide) (CNPPTA)-based aramid copolymers were synthesized using a lowtemperature polycondensation reaction between terephthaloyl chloride; 2-cyano-1,4- phenylene diamine, and/or 1,4-phenylene diamine in N,N-dimethylacetamide (DMAc). The aramid homopolymer and copolymers were dry-jet wet spun from the spinning dopes, which consisted of 13 wt% polymer and DMAc. Both the tensile strength and tensile modulus of the spun aramid fibers containing 60 mol% of 2-cyano-1,4-phenylene diamine were found to be enhanced by heat treatment. Wide-angle x-ray diffraction analysis revealed that crystallinity and crystal orientation were increased by heat treatment, which resulted in increased tensile strength and modulus. The effects of heat treatment on the tensile properties of aramid fibers have been studied by the concept of structure-property relations.

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pISSN : 1225 - 1089
eISSN : 2288 - 6419

한국연구재단 우수등재학술지 유지 (2022년)