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Phase Transitions In Blends Of Liquid Crystalline Polymer/Polyether Imide

Published online by Cambridge University Press:  15 February 2011

Joonhyun Nam ,
Tomohiro Fukai  and
Thein Kyu
Joonhyun Nam
Affiliation:
Institute of Polymer Engineering, The University of Akron, Akron, OH 44325–0301
Tomohiro Fukai
Affiliation:
Institute of Polymer Engineering, The University of Akron, Akron, OH 44325–0301
Thein Kyu
Affiliation:
Institute of Polymer Engineering, The University of Akron, Akron, OH 44325–0301
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Abstract

A thermotropic liquid crystalline copolymer consisting of bisphenol E diacetate, isophthalic acid and 2,6-naphthalene dicarboxylic acid was blended with polyether imide by dissolving in a mixed solvent of phenol/1,1,2,2-tetrachloroethane in a ratio of 60/40 w/w and co-precipitating the ternary solution in non-solvent (methanol). Wide-angle x-ray diffraction and differential scanning calorimetry studies revealed that the blends were completely amorphous with a single glass transition temperature. The single phase was probably entrapped during solvent removal, but these mixes were unstable and phase separated upon heating. Mesophase structure developed in the LCP rich region with continued annealing. The evolution of crystalline texture was monitored by time-resolved wide-angle x-ray diffraction following a temperature jump from ambient to 265 °C. The recrystallization process of LCP was found to slow down in the blend state relative to that of the neat LCP.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 227: Symposium J – Materials Science of High Temperature Polymers for Microelectronics , 1991 , 313
Copyright
Copyright © Materials Research Society 1991

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References

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