BMI/PU材料的室温制备及其耐热性能研究

Room temperature preparation and heat resistance of BMI/PU materials

以聚氧化丙烯二醇(PPG)、多苯基多亚甲基多异氰酸酯(PAPI)、N,N′-(4,4′-亚甲基二苯基)双马来酰亚胺(BMI)、二乙醇胺(DEA)等为主要原料,采用室温固化成型工艺制备了系列不同BMI含量的双马来酰亚胺/聚氨酯(BMI/PU)材料。采用红外光谱表征了BMI/PU材料的结构,通过力学、耐热老化性、耐热软化粘连性及热稳定性能测试,研究了BMI/PU材料的性能。结果表明,随着BMI含量的增加,BMI/PU材料的弹性模量、邵氏A硬度逐渐提高,断裂伸长率逐渐降低,拉伸强度先增大后减小。BMI/PU材料的耐热老化性能及耐热软化粘连性能逐渐提高。BMI/PU材料的初始热降解温度T_(5%)逐渐降低,但其T_(20%)、T_(50%)及残炭率均逐渐提高。

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′-methylene-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 temperature T_(5%) decreased gradually,and the T_(20%),T_(50%) and residual rate increased gradually.