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http://dx.doi.org/10.12772/TSE.2013.50.217

Effect of Wet-Spinning and Heat-Treatment on the Structure and Mechanical Properties of Polyhydroxyamide Fibers(I) -Coagulation Behavior at Various Coagulation Conditions-  

Kang, Chan Sol (Department of Advanced Organic Materials and Textile System Engineering, Chungnam National University)
Jee, Min Ho (Department of Advanced Organic Materials and Textile System Engineering, Chungnam National University)
Baik, Doo Hyun (Department of Advanced Organic Materials and Textile System Engineering, Chungnam National University)
Publication Information
Textile Science and Engineering / v.50, no.4, 2013 , pp. 217-224 More about this Journal
Abstract
Polyhydroxyamide (PHA) was synthesized using low temperature solution polymerization of 3,3'-dihydroxybenzidine (DHB) and isophthaloyl chloride (IPC) in N,N-dimethylacetamide (DMAc). In order to study wet-spinning of PHA fibers, the diffusion property of DMAc in various coagulants and the effect of coagulation bath temperature were evaluated. The initial diffusion rate of DMAc, and the SEM images and mechanical properties of PHA fibers, demonstrated that the coagulation in ethanol at $20^{\circ}C$ was the most optimal among all the conditions examined. The tensile strength and initial modulus of PHA fibers increased, while its breaking strain decreased with increasing spin draw ratio (SDR). The wide-angle X-ray diffraction (WAXD) experiment revealed that the crystallinity of PHA fibers increased with increasing SDR. The process-structure-property relationship among PHA fibers under various coagulation conditions was also investigated.
Keywords
PHA fibers; spinning dope; coagulation bath temperature; coagulants; initial diffusion rate; spin draw ratio;
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