Study and control of phase morphology in liquid crystal polyester–poly(alkylene terephthalate) blends

Authors

  • J. -F. Croteau,

    1. Centre de Recherche en Sciences et Ingénierie des Macromolécules, Départment de Chimie, Université Laval, Sainte-Foy, Québec, Canada G1K 7P4
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  • G. V. Laivins

    1. Centre de Recherche en Sciences et Ingénierie des Macromolécules, Départment de Chimie, Université Laval, Sainte-Foy, Québec, Canada G1K 7P4
    Current affiliation:
    1. Pulp and Paper Research Institute of Canada, 570 John's Boulevard, Pointe Claire, PQ, Canada H9R 3J9
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Abstract

Scanning electron microscopy (SEM) reveals that the morphologies of poly(hexamethylene terephthalate) (PHMT) and poly(p-oxybenzoate co-ethylene terephthalate) (LCP6/4) blends are biphasic. When LCP6/4 is the minor component, liquid crystalline domains are embedded in the matrix. The reaction in the melt between the polymers apparently increases the adhesion of the matrix to the embedded domains. As the reaction proceeds, the chemical composition of the matrix progressively becomes modified. High reaction temperatures, small particle size, mixing coupled with particle dispersion and high LCP6/4 content in the mixture promote the melt reaction and decrease the PHMT content in the polymer formed. At 260°C, the coaddition of di-n-octadecyl phosphite (DNOP) at a 2% weight fraction with PHMT and LCP6/4 inhibits the reaction between the polymers for 2 h.

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