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Structure Development in Melt Spinning Filaments From Polybutylene Terephthalate Based...

By LI, HANG; WHITE, JAMES L.
Publication: Polymer Engineering and Science
Date: Saturday, April 1 2000

Structure development in polybutylene terephthalate (PBT) and thermoplastic elastomers (TPEs) based on PBT during the melt spinning process was investigated. Melt spun filaments were examined using wide angle X-ray diffraction and birefringence. Crystalline orientation was characterized in terms of Hermans-Stein orientation factors. Crystalline orientation and birefringence were found to correlated with spinline stress better than drawdown ratio. Crystalline orientation development was strongly dependent on spinline stress. The TPEs with low PET content had low birefringence altho

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