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Studies on the ternary blends of liquid crystalline polymer and polyesters

Studies on the ternary blends of liquid crystalline polymer and polyesters Thermotropic liquid crystalline polymer made up of poly(p-hydroxybenzoate) (PHB)-poly(ethylene terephthalate) (PET) 8/2 copolyester, poly(ethylene 2,6-naphthalate) (PEN) and PET were mechanically blended to pursue the liquid crystalline phase of ternary blends. Complex viscosities of blends decreased with increasing temperature and PHB content. DSC thermal analysis indicated that glass transition temperature (Tg) and melting temperature (Tm) of blends increased with increasing PHB content. Both tensile strength and initial modulus increased with raising PHB content and take-up speed of monofilaments. In the WAXS diagram, only PEN crystal reflection at 2Θ=15.5o appeared but PET crystal reflection was not shown in all compositions. The degree of transesterification and randomness of blends increased with blending time but sequential length of both PEN and PET segment decreased. http://www.deepdyve.com/assets/images/DeepDyve-Logo-lg.png Fibers and Polymers Springer Journals

Studies on the ternary blends of liquid crystalline polymer and polyesters

Kim, Seong Hun; Kang, Seong Wook
Fibers and Polymers , Volume 1 (2): 9 – Jun 1, 2000
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References (21)

Publisher
Springer Journals
Copyright
Copyright © The Korean Fiber Society 2000
ISSN
1229-9197
eISSN
1875-0052
DOI
10.1007/bf02875190
Publisher site
See Article on Publisher Site

Abstract

Thermotropic liquid crystalline polymer made up of poly(p-hydroxybenzoate) (PHB)-poly(ethylene terephthalate) (PET) 8/2 copolyester, poly(ethylene 2,6-naphthalate) (PEN) and PET were mechanically blended to pursue the liquid crystalline phase of ternary blends. Complex viscosities of blends decreased with increasing temperature and PHB content. DSC thermal analysis indicated that glass transition temperature (Tg) and melting temperature (Tm) of blends increased with increasing PHB content. Both tensile strength and initial modulus increased with raising PHB content and take-up speed of monofilaments. In the WAXS diagram, only PEN crystal reflection at 2Θ=15.5o appeared but PET crystal reflection was not shown in all compositions. The degree of transesterification and randomness of blends increased with blending time but sequential length of both PEN and PET segment decreased.

Journal

Fibers and Polymers – Springer Journals

Published: Jun 1, 2000

Keywords: Liquid crystal polymer; Fiber spinning; Mechanical property; Polyethylene naphthalate

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