Abstract
Abstract: Polyhydroxyamide (PHA) was synthesized using low temperature solution polymerization of 3,3'-dihydrox-ybenzidine (DHB) and isophthaloyl chloride (IPC) in N,N-dimethylacetamide (DMAc). In order to study wet-spinningof PHA fibers, the diffusion property of DMAc in various coagulants and the effect of coagulation bath temperaturewere evaluated. The initial diffusion rate of DMAc, and the SEM images and mechanical properties of PHA fibers,demonstrated that the coagulation in ethanol at 20 o C was the most optimal among all the conditions examined. Thetensile strength and initial modulus of PHA fibers increased, while its breaking strain decreased with increasing spindraw ratio (SDR). The wide-angle X-ray diffraction (WAXD) experiment revealed that the crystallinity of PHA fibersincreased with increasing SDR. The process-structure-property relationship among PHA fibers under various coagula-tion conditions was also investigated. Keywords: PHA fibers, spinning dope, coagulation bath temperature, coagulants, initial diffusion rate, spin draw ratio
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