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Thermotropic liquid-crystalline aromatic polyester-graft-poly(2,6-dimethyl-1,4-phenylene oxide) copolymers

✍ Scribed by Moriyuki Sato; Takashi Mangyo; Ken-ichi Mukaida

Publisher
John Wiley and Sons
Year
1995
Tongue
English
Weight
561 KB
Volume
196
Category
Article
ISSN
1022-1352

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✦ Synopsis

Dicarboxy-terminated poly(2,6-dimethyl-l ,Cphenylene oxide) (PPO) macromonomers were prepared and subjected to the preparation of tailor-made aromatic thermotropic liquid-crystalline (LC) polyester-graft-PPO copolymers. The macromonomers were obtained by hydrolysis of dimethyl carboxylate-terminated PPO macromonomers without cleavage of the PPO chains, which were derived from PPO oligomers with a terminal phenolic OH-group and a bromo derivative of isophthalatc. The tailor-made aromatic thermotropic LC graft copolymers were prepared by direct polycondensation from the dicarboxy-terminated macromonomers, p-hydroxybenzoic acid, aromatic dicarboxylic acids and diphenols at definite mole ratios in pyridine in the presence of diphenyl chlorophosphate as a condensation reagent. The polyester-graft-PPO copolymers are thermally stable up to 280-300°C and show a thermotropic LC nematic phase in spite of introduction of PPO grafts on the polyester backbones.

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