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Synthesis of liquid crystalline polyesterimides by melt polymerization and its application to polymer‐dispersed liquid crystal
Author(s) -
Park LeeSoon,
Lee DongChan,
Kil YooSeong,
Ahn TaeOan
Publication year - 1998
Publication title -
journal of applied polymer science
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.575
H-Index - 166
eISSN - 1097-4628
pISSN - 0021-8995
DOI - 10.1002/(sici)1097-4628(19980822)69:8<1517::aid-app5>3.0.co;2-f
Subject(s) - thermotropic crystal , mesogen , liquid crystal , materials science , polymerization , polymer chemistry , polymer , trimellitic anhydride , solvent , polyester , polarized light microscopy , optical microscope , condensation polymer , chemical engineering , organic chemistry , liquid crystalline , composite material , chemistry , scanning electron microscope , physics , optoelectronics , optics , engineering
N ‐(4‐Carboxyphenyl)trimellitimide (DAI) was synthesized from trimellitic anhydride and p ‐aminobenzoic acid by a one‐step reaction utilizing m ‐cresol as a solvent. DAI was reacted with hexanediol and nonanediol to give bishydroxyhexyltrimellitimide (BHHI) and bishydroxynonyltrimellitimide (BHNI), respectively. Thermotropic liquid crystalline polyesterimides with BHHI and BHNI as a mesogenic group and 6 and 9 methylene units as a spacer were synthesized by a direct melt‐polymerization method similar to the one used in the preparation of commercial polyester. Polyesterimides were characterized by IR, 1 H‐NMR, DSC, and a polarized optical microscope. Their application as a matrix (binder) of polymer‐dispersed liquid crystal (PDLC) was investigated with 4‐heptyloxybenzoic acid as a low molecular weight liquid crystal (LMWLC). From the PDLC experiment, polyesterimides were found to be useful as a matrix for the high‐temperature PDLC above 100°C. © 1998 John Wiley & Sons, Inc. J Appl Polym Sci 69: 1517–1522, 1998