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Synthesis and Curing of Liquid‐Crystalline Epoxy Resins Containing a Biphenyl Mesogen
Author(s) -
Liu Guodong,
Gao Jungang,
Song Lili,
Hou Wenjun,
Zhang Liucheng
Publication year - 2006
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.200600372
Subject(s) - mesogen , thermotropic crystal , biphenyl , curing (chemistry) , polymer chemistry , diglycidyl ether , monomer , arrhenius plot , ether , materials science , alkoxy group , liquid crystalline , diamine , epoxy , chemistry , alkyl , organic chemistry , composite material , activation energy , polymer , bisphenol a
Summary: Liquid crystalline epoxies with a biphenyl mesogenic group have been widely studied although it is still in contention as to whether the diglycidyl ether of DGEBP shows a thermotropic phase. DEPBP was synthesized by partial oxidation and the liquid crystalline properties were investigated. Despite their similar structures their molecular weights are quite different. DEPBP has a distinct molecular weight, while DGEBP shows a molecular weight distribution. DEPEBP was also synthesized and characterized to investigate the influence of the flexible spacer. By incorporation of a flexible ethoxy group, the monomer shows no thermotropic property even in its curing reaction with an aromatic diamine, DDM. The curing rate was decelerated and the cured network showed a T g even lower than that of cured DGEBA/DDM. The curing kinetics of DEPBP and DEPEBP were also tentatively investigated.Arrhenius plot of DEPBP/DDM at α = 0.15.
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