Effects of Drawing Conditions on the Properties of PBT/PTMGTbased Elastomeric Fibers 


Vol. 56,  No. 6, pp. 424-432, Dec.  2019
10.12772/TSE.2019.56.424


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  Abstract

Segmented block copolyetheresters based on poly(butylene terephthalate) (PBT) as a hard segment and poly(tetramethylene ether glycol) (PTMG) as a part of a soft segment were synthesized with varying hard segment content (HSC). The number average molecular weights of PTMG selected for use in this study were 650, 1000, 1800. The effects of the HSC and PTMG’s molecular weight on the thermal properties of the copolyetheresters were examined, and five samples were selected for melt-spinning. From the results of the mechanical properties of the samples, we concluded that copolyetherester having 30 wt% of HSC with PTMGT 1800 is the best candidate among the copolymers tested for elastomeric fiber application. The fiber prepared from HSC 30 and PTMG 1800 was then drawn at various drawing temperatures and ratios. When the draw ratio was held constant, fibers drawn at higher temperature showed higher tenacity but lower elongation at break. This result is proposed to be due to the differences in the effectiveness of heat on the crystallinity, crystal size, and crystal orientation increments during the hot drawing process.

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pISSN : 1225 - 1089
eISSN : 2288 - 6419

한국연구재단 우수등재학술지 유지 (2022년)