Synthesis of liquid crystalline polyesterimides by melt polymerization and its application to polymer-dispersed liquid crystal

✍ Scribed by Lee-Soon Park; Dong-Chan Lee; Yoo-Seong Kil; Tae-Oan Ahn

• Publisher: John Wiley and Sons
• Year: 1998
• Tongue: English
• Weight: 223 KB
• Volume: 69
• Category: Article
• ISSN: 0021-8995
• DOI: 10.1002/(sici)1097-4628(19980822)69:8<1517::aid-app5>3.0.co;2-f

✦ Synopsis

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 100ЊC.