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Studies on thermal and morphological properties of 1,1‐bis(3‐methyl‐4‐cyanatophenyl)cyclohexane‐epoxy‐bismaleimide matrices
Author(s) -
Dinakaran K.,
Alagar M.
Publication year - 2003
Publication title -
polymers for advanced technologies
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.61
H-Index - 90
eISSN - 1099-1581
pISSN - 1042-7147
DOI - 10.1002/pat.366
Subject(s) - cyanate ester , epoxy , materials science , thermogravimetric analysis , heat deflection temperature , cyanate , differential scanning calorimetry , cyclohexane , polymer chemistry , curing (chemistry) , composite material , glass transition , polymer , organic chemistry , izod impact strength test , chemistry , ultimate tensile strength , physics , thermodynamics
Abstract A new cyanate ester monomer, 1,1‐bis(3‐methyl‐4‐cyanatophenyl)cyclohexane has been synthesized and characterized. Epoxy modified with 4, 8 and 12% (by weight) of cyanate ester were made using epoxy resin and 1,1‐bis(3‐methyl‐4‐cyanatophenyl)cyclohexane and cured by using diaminodiphenylmethane. The cyanate ester modified epoxy matrix systems were further modified with 4, 8 and 12% (by weight) of bismaleimide (N,N′‐bismaleimido‐4,4′‐diphenylmethane). The formation of oxazolidinone and isocyanurate during cure reaction of epoxy and cyanate ester blend was confirmed by IR spectral studies. Bismaleimide‐cyanate ester‐epoxy matrices were characterized using differential scanning calorimetry (DSC), thermogravimetric analysis (TGA) and heat deflection temperature (HDT) analysis. Thermal studies indicate that the introduction of cyanate ester into epoxy resin improves the thermal degradation studies at the expense of glass transition temperature. Whereas the incorporation of bismaleimide into epoxy resin enhances the thermal properties according to its percentage content. However, the introduction of both cyanate ester and bismaleimide influences the thermal properties according to their percentage content. DSC thermogram of cyanate ester modified epoxy and bismaleimide modified epoxy show unimodel reaction exotherms. The thermal degradation temperature and heat distortion temperature of the cured bismaleimide modified epoxy and cyanate ester‐epoxy systems increased with increasing bismaleimide content. The morphology of the bismaleimide modified epoxy and cyanate ester‐epoxy systems were also studied by scanning electron microscopy. Copyright © 2003 John Wiley & Sons, Ltd.