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Curing kinetics of liquid‐crystalline epoxy resins with inverse reactivity ratios
Author(s) -
Mititelu Alice,
Hamaide Thierry,
Novat Christian,
Dupuy Jérôme,
Cascaval Constantin N.,
Simionescu Bogdan Cristofor,
Navard Patrick
Publication year - 2000
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 - 10.1002/1521-3935(20000801)201:12<1209::aid-macp1209>3.0.co;2-i
Subject(s) - epoxy , diglycidyl ether , curing (chemistry) , mesogen , polymer chemistry , kinetics , polymerization , melting point , ether , materials science , reactivity (psychology) , chemistry , liquid crystal , composite material , organic chemistry , liquid crystalline , polymer , bisphenol a , medicine , physics , alternative medicine , quantum mechanics , pathology , optoelectronics
Epoxy resins with mesogenic groups were prepared from diglycidyl ether of 4,4′‐biphenol (DGEBP) as rigid block and 4,4′‐diaminodiphenylsulphone (DDS). Curing kinetics were investigated using size exclusion chromatography in the 155–175°C range above the melting temperature. It was found that the ratio r = k 2 / k 1 of secondary to primary amino hydrogen rate constants displays unusual values higher than unity and decreased on increasing the temperature. This effect was assumed to be due to the nematic structure in which polymerization takes place before reaching the gel point.