Studies on thermotropic liquid-crystalline polymers: Part X. Synthesis and properties of crosslinkable aromatic copoly(ester)s containing conjugated double bonds

A series of aromatic copoly(ester)s containing conjugated double bonds was prepared from p‐phenylene bis(acrylic acid) (PPBA) with a mixture of methylhydroquinone (MHQ) and various hydroxycarboxylic acids in the presence of diphenylchlorophosphate (DPCP) and pyridine as a catalyst and solvent. The p...

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Bibliographic Details
Published in:Journal of polymer science. Part A, Polymer chemistry Polymer chemistry, 1993-03, Vol.31 (4), p.971-976
Main Authors: Hsu, Keh-Ying, Chang, Teh-Chou, Li, Chen-Hui
Format: Article
Language:English
Subjects:
aromatic copolyester
conjugated double bonds
photocrosslinking
thermotropic liquid-crystalline
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Summary:A series of aromatic copoly(ester)s containing conjugated double bonds was prepared from p‐phenylene bis(acrylic acid) (PPBA) with a mixture of methylhydroquinone (MHQ) and various hydroxycarboxylic acids in the presence of diphenylchlorophosphate (DPCP) and pyridine as a catalyst and solvent. The phase behavior of these polymers was studied by differential scanning calorimetry (DSC) and thermal optical polarized microscopy. Under an optical polarized microscope all copoly(ester)s show a nematic thermotropic liquidcrystalline phase. Upon heating, these polymers undergo a photocrosslinking reaction characterized by IR and solubility analysis. This crosslinking reaction also takes place in the liquid‐crystalline phase with the retention of the nematic order in the final crosslinked solid. © 1993 John Wiley & Sons, Inc.
ISSN:0887-624X
1099-0518
DOI:10.1002/pola.1993.080310416