丙烯基苯化合物改性双马来酰亚胺树脂 Ⅱ.改性树脂的固化及性能

Propenylphenyl Compound Modified Bismaleimide Resin (Ⅱ) Cure and Properties of Modified BMI Resin

用ＤＳＣ研究了ＢＰＰＤＰＳ改性ＢＭＩ树脂固化反应动力学，获得固化反应级数ｎ＝１．４，活化能Ｅ＝８１．２４ｋＪ／ｍｏｌ，以及树脂的固化工艺：１４０℃，１ｈ；１９０℃，２ｈ；２５０℃，４ｈ。测定了不同配比固化树脂的吸水率、玻璃化温度、热氧化性和弯曲性能，当树脂配比为１．５：１时，固化树脂表现优良的耐热性，特别是在耐热性方面，２３０℃弯曲强度保留达８２．４％，并用Ｆｒｉｅｄｍａｎ法推导出固化树脂的热降解反应活化能为２９０ｋＪ／ｍｏｌ，遵循一级反应。

The thermally initiated cure of modified BMI resin was monitored by different scanning calorimetry (DSC), and kinetic parameters were obtained by Kissinger method: reaction order n =1.4, Ea=81.2kJ/mol. By cure analysis, the cure cycle was got: 140℃ 1h, 190℃ 2h, 250℃ 4h, which could get complete cure. The water absorption, glass transformation temperature (T g), thermal degradation and mechanical properties of the BPPDPS/BMI resin with different ratio were studied. When the molar ratio was 1.5:1(BMI/BPPDPS), the cured resin shows excellent high temperature properties with low degradation rate and high flexural strength retention(230℃, 82.4%). Also the thermal decomposition kinetic parameters was investigated by thermogravimetric analysis(TGA).