Room temperature preparation and heat resistance of BMI/PU materials
A series of bismaleimide/polyurethane(BMI/PU)materials with different BMI contents were prepared by room temperature curing molding process using polyoxypropylene glycol(PPG),polyphenyl polymethylene polyisocyanate(PAPI),N,N'-(4,4'-methyle-ne-diphenyl)bismaleimide and diethanolamine(DEA)as main raw materials.The structure of BMI/PU materials was characterized by infrared spectroscopy.The properties of BMI/PU materials were studied by testing the mechanical properties,heat aging resistance,heat softening adhesion resistance and thermal stability.The results showed that with the increase of BMI content,the elastic modulus and Shore A hardness of BMI/PU materials increased gradually,the elongation at break decreased gradually,and the tensile strength increased firstly and then decreased.With the increase of BMI content,the heat aging resistance and heat softening adhesion resistance of BMI/PU materials increased gradually,the initial thermal degradation temperatureT5％decreased gradually,and the T20％,T50％and residual rate increased gradually.
bismaleimidepolyurethaneroom temperature curingheat resistance
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