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Liquid crystalline aromatic polyesters containing para-linked dimethylbiphenylene moieties

✍ Scribed by Akinori Shiotani; Fumio Matsuo

Publisher: John Wiley and Sons
Year: 1996
Tongue: English
Weight: 374 KB
Volume: 59
Category: Article
ISSN: 0021-8995
DOI: 10.1002/(sici)1097-4628(19960321)59:12<1907::aid-app13>3.0.co;2-o

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✦ Synopsis

A series of liquid crystalline aromatic polyesters containing 3,3'-dimethylbipheny1-4,4'-dicarboxylic acid and 3,4'-dimethyl-biphenyl-4,3'-dicarhoxylic acid was prepared by a melt polycondensation procedure and characterized by elemental analysis, DSC and TMA measurements, and optical polarizing microscopy. An optimal composition of the copolymer having a melting temperature around 300°C is proposed and the rheoIogical behavior is discussed. Most of the mechanical properties of this copolymer were found to be close to those of Vectra A950@ used as a reference sample.

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Preparation of polyamides containing par

Preparation of polyamides containing para-linked dimethylbiphenylene moieties

✍ Akinori Shiotani; Katsutoshi Washio 📂 Article 📅 1998 🏛 John Wiley and Sons 🌐 English ⚖ 163 KB

A series of wholly aromatic polyamides containing 3,3 -dimethylbiphenyl-4,4-dicarboxylic acid (P-DMBA) and 3,4 -dimethylbiphenyl-4,3 -dicarboxylic acid (Q-DMBA) was prepared by the direct polycondensation method using triphenylphosphite and pyridine. Most of the polymers are readily soluble in polar