Synthesis,characterization,and properties of novel novolac epoxy resin containing naphthalene moiety

摘要

A series of novel novolac epoxy resins containing naphthalene moiety with different molecular weights were synthesized via condensation of bisphenol A and 1-naphthaldehyde,followed by epoxidation with epichlorohydrin.The chemical structure of the naphthalene epoxy thus obtained was characterized using FTIR,1H NMR spectra and GPC analyses.The naphthalene epoxy was cured with 4,4'-diaminodiphenyl sulfone(DDS)and the cured products were characterized with thermogravimetric analysis,dynamic mechanical analysis,and X-ray diffraction.Compared with the diglycidyl ether of bisphenol A(DGEBA),the cured naphthalene epoxy resin showed remarkably higher glass transition temperatures(T_gs),enhanced thermal stability and better moisture resistance.When the molar ratio of 1-naphthaldehyde to bisphenol A was 0.67,the optimal thermal resistance was observed.