Thermotropic polyesters: Synthesis and properties of poly( p ‐oxybenzoate‐ co‐m ‐phenylene terephthalate)s | Zendy

Brown Philip J. | Zendy; Karacan Ismail | Zendy; Liu Jing | Zendy; McIntyre J. Eric | Zendy; Milburn Alexander H. | Zendy; Tomka J. George | Zendy

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Thermotropic polyesters: Synthesis and properties of poly( p ‐oxybenzoate‐ co‐m ‐phenylene terephthalate)s

Author(s) -

Brown Philip J.,

Karacan Ismail,

Liu Jing,

McIntyre J. Eric,

Milburn Alexander H.,

Tomka J. George

Publication year - 1991

Publication title -

polymer international

Language(s) - English

Resource type - Journals

SCImago Journal Rank - 0.592

H-Index - 105

eISSN - 1097-0126

pISSN - 0959-8103

DOI - 10.1002/pi.4990240105

Subject(s) - thermotropic crystal , materials science , phenylene , polyester , polymer chemistry , liquid crystal , copolymer , thermal stability , polymer , composite material , organic chemistry , liquid crystalline , chemistry , optoelectronics

DSC, TMA, hot‐stage microscopy and WAXS have been used to examine the effect of concentration of angular units and molecular weight on the thermal transitions of poly( p ‐oxybenzoate‐ co‐m ‐phenylene terephthalate)s. Copolymers containing molar fractions of m ‐phenylenedioxy units between 0·20 and 0·30 are melt processable nematogenic materials. In contrast, poly( p ‐oxybenzoate‐ co‐p ‐phenylene isophthalate)s remain nematogenic over a wider concentration range (0·20–0·40) of angular isophthaloyl units. Comparison of fibres produced from copolymers with the same fraction of angular units (0·25) indicates that those with isophthaloyl units have a higher modulus than those with m ‐phenylenedioxy units. These differences are ascribed to differences in planarity of chains containing isophthaloyl and m ‐phenylenedioxy units, respectively.

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