Abstract
AbstractA bismaleimide monomer, 4,4′‐bis(4‐maleimidophenoxy)‐3,3′,5,5′‐tetramethyl biphenyl (BMITB), was synthesized in high yield (94%) via a facile four‐step reaction from 2,2′,6,6′‐tetramethyl‐4,4′‐biphenol. The chemical structure of BMITB was confirmed by FTIR, 1H NMR, 13C NMR and elemental analysis. The monomer used to modify the epoxy cresol‐formaldehyde novolac resin (ECN)/diaminodiphenyl sulfone (DDS) system. Cured ECN/BMITB/DDS blends with higher BMITB content had two distinct glass transition temperatures that were above 250°C according to differential scanning calorimetry, indicating that an interpenetrated polymer network structure may be formed. The initial thermal decomposition temperature and integral procedure decomposition temperature of the cured ECN/BMITB/DDS blends were >390 and 1080°C, respectively, according to thermogravimetric analyses. No phase separation was observed in dynamic mechanical analysis of cured ECN/BMITB/DDS blends with small amounts of BMITB (5 and 10 wt%). POLYM. ENG. SCI., 2009. © 2009 Society of Plastics Engineers
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