Prepolymerizations of 4,4 0 -bismaleimidodiphenylmethane (BMI), diallyl isocyanurate (DAIC), and melamine (ML) at 160-1708C and subsequent compression molding at 200-2808C yielded cured BMI/DAIC/ML resins with feed molar ratios of 4/1/1, 3/1/1, and 2/1/1 (BMI-DAIC-ML411, 311, and 211). Similarly, cured BMI/DAIC 1/1 and BMI/ML 3/1 resins (BMI-DAIC11 and BMI-ML31) were prepared. The FT-IR analysis revealed that the maleimide and allyl groups were almost consumed for all the cured resins, and the hydrogen bonding interaction became stronger with decreasing BMI contents for BMI-DAIC-MLs. Based on the cured structures elucidated from the FT-IR result, the numbers of multiple hydrogen bonds and cross-linking covalent bonds (N MHB and N CB ), and total cross-linking bond energy (E TB ) were evaluated to be 0, 7.92, and 618 for BMI-DAIC-ML411, 0.71, 7.81, and 627 for BMI-DAIC-ML311, and 0.95 mol kg
21, 7.61 mol kg
21, and 617 kcal kg 21 for BMI-DAIC-ML211, respectively. A higher order of glass transition and 5% weight loss temperatures for BMI-DAIC-MLs was 411 > 311 > 211 in accordance with a higher order of N CB . BMI-DAIC-MLs displayed a weak tan d peak at 70-1508C due to dissociation of the hydrogen bonds. The flexural strength and modulus of BMI-DAIC-ML311 were higher than those of BMI-DAIC-ML411 in accordance with the difference of E TB . V C 2015 Wiley Periodicals, Inc. J. Appl. Polym.Sci. 2016, 133, 43121.
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