活性稀释剂对T700/BMI复合材料湿热性能的影响

Effect of reactive diluent on hydrothermal properties of T700/BMI composites

采用苯乙烯作二烯丙基双酚A(DABPA)改性双马来酰亚胺(BMI)树脂体系的活性稀释,以减小树脂的粘度。为研究苯乙烯的用量对炭纤维(T700)增强改性BMI树脂基复合材料湿热性能的影响,对T700/BMI复合材料的试样在70℃水中进行吸湿实验,并检测其力学性能。结果表明,随苯乙烯用量的增加,试样的吸湿率降低;其拉伸、弯曲和层间剪切等强度保持率也随之增大;但当苯乙烯在基体树脂中的摩尔百分含量超过20%之后,试样的拉伸强度会下降。

Styrene was used as reactive diluent to decrease the viscosity of Bismaleimide（BMI） resin modified by Diallylbisphe- nol A（ DABPA）. T700/BMI composite materials were prepared as testing samples,which are made up of the carbon fiber（TT00） as reinforcing material and modified BMI resin as matrix. In order to investigate the effects of styrene content in matrix on the hydro- thermal properties of the sample, the moisture absorptions were measured for the samples in 70 ℃ water, and their mechanical properties were tested too. The results show that moisture absorption of the sample can be decreased with increasing styrene content, and the higher styrene content is responsible for the higher retentions in tensile, flexure and lamellar shear strengths for the sample. However the tensile strength of sample declines when styrene content exceeds 20% （ tool% ） in matrix.