Thermally induced reorganization in LCP fibers: Molecular origin of mechanical strength

Document Type

Conference Proceeding

Publication Date

7-1-2008

Abstract

The molecular reorganization occurring in liquid crystalline polymer fiber during heat treatment is of great interest for many commercial reasons. Using thermal analysis techniques, WAXS and real time temperature dependent synchrotron SAXS, the structure and morphology of commercial LCP (liquid crystalline polymer), Vectran®, HBA/HNA (p-hydroxybenzoic acid/6-hydroxy-2-naphthoic acid), and its variant polymer fiber COTBP, HBA/HNA/BP/TA (BP-benzophenone, TA-terephthalic acid), have been examined. Both fibers have the typical liquid crystalline polymer structure, i.e., highly aligned with aperiodic sequencing along the fiber axis. There is a three-fold increase in strength in both fibers with heat treatment; however, the modulus is observed to increase significantly in COTBP but not in Vectran®. This paper reports on the changes and the differences on the structural and morphological behavior for both the as-spun and heat-treated LCP fibers. We propose an 'oriented entanglement' model to describe the differences between the two polymer fibers. © 2008 Springer Science+Business Media, LLC.

Identifier

46449128561 (Scopus)

Publication Title

Journal of Thermal Analysis and Calorimetry

External Full Text Location

https://doi.org/10.1007/s10973-007-8867-0

ISSN

13886150

First Page

175

Last Page

182

Issue

1

Volume

93

Grant

W-7405-Eng-48

Fund Ref

U.S. Department of Energy

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