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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