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    한국섬유공학회지, Vol.56, No.4, pp. 242-247, 2019
    시아노기가 도입된 파라계 아라미드 섬유의 열처리에 따른 구조와 물성
    Structure and Properties of Heat-treated p-Aramid Fibers Containing Cyano Groups
     
    이일재 · 장은지 · 차화현 · 백두현
     
    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.
     
    Keywords : aramid fibers, cyano group, heat-treatment, WAXD, tensile properties
    DOI : https://doi.org/10.12772/TSE.2019.56.242
     
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