Preparation and characterization of semi-flexible thermotropic poly(ester-imide)s

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Title: Preparation and characterization of semi-flexible thermotropic poly(ester-imide)s
Author: Facinelli, John V.
Abstract: A series of novel poly(ester-1m1de)s were prepared by the reaction of meta- and para-substituted trlmellltimide dicarboxylic diacid chlorides with various diols containing four, five, six, seven, eight, nine, ten and twelve methylene groups by a solution polymerization technique utilizing refluxing 1,2,4-trichlorobenzene as a solvent. The poly(ester-1mide)s were characterized by dilute solution viscosity, infrared spectroscopy, differential scanning calorimetry and polarized light microscopy. The inherent viscosities of the meta-substituted poly(ester-imide)s ranged from 0.06 to 0.25 dL/g while those of the para-substituted poly(ester-imide)s ranged from 0. 1 0 to 0.65 dL/g and were obviously of higher molecular weight. The meta series were amorphous and showed no mesophase formation. The para-substituted poly(ester-1m1de)s having four, six, eight or ten methylene spacers showed birefringent liquid-crystalline behavior.
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Date: 1989-12

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