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Thermally induced reorganization in LCP fibers

Molecular origin of mechanical strength

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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.

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Authors and Affiliations

  1. Lawrence Livermore National Laboratory, Livermore, CA, 94551, USA

    C. K. Saw

  2. New Jersey Institute of Technology, Newark, NJ, 07102, USA

    G. Collins & M. Jaffe

  3. Alcon Laboratories, Inc, Fort Worth, TX, 76134, USA

    J. Menczel

Authors
  1. C. K. Saw
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  2. G. Collins
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  3. J. Menczel
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  4. M. Jaffe
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Corresponding author

Correspondence to J. Menczel.

Additional information

Portion of this work was performed when the authors were at Hoechst-Celanese. Recent work by CKS was performed under the auspices of the U. S. Department of Energy by the University of California, Lawrence Livermore National Laboratory under Contract No. W-7405-Eng-48.

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Saw, C.K., Collins, G., Menczel, J. et al. Thermally induced reorganization in LCP fibers. J Therm Anal Calorim 93, 175–182 (2008). https://doi.org/10.1007/s10973-007-8867-0

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

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