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Thermotropic liquid‐crystalline aromatic polyester‐ graft ‐poly(2,6‐dimethyl‐1,4‐phenylene oxide) copolymers
Author(s) -
Sato Moriyuki,
Mangyo Takashi,
Mukaida Kenichi
Publication year - 1995
Publication title -
macromolecular chemistry and physics
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.57
H-Index - 112
eISSN - 1521-3935
pISSN - 1022-1352
DOI - 10.1002/macp.1995.021960533
Subject(s) - thermotropic crystal , polymer chemistry , copolymer , phenylene , polyester , condensation polymer , materials science , polymerization , chemistry , organic chemistry , phase (matter) , catalysis , polymer , liquid crystalline
Dicarboxy‐terminated poly(2,6‐dimethyl‐1,4‐phenylene 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 isophthalate. 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.