活性稀释剂对T700/BMI复合材料力学性能的影响

THE EFFECT OF REACTIVE DILUENT IN RESIN ON MECHANICAL PROPERTIES OF T700/BMI COMPOSITE MATERIALS

本文采用苯乙烯作改性BMI树脂的活性稀释剂以降低树脂粘度,并对该树脂体系进行了DSC测试和IR光谱分析。实验表明,加入苯乙烯后,树脂体系的反应活性极大提高,固化温度降低。实验还研究了苯乙烯的用量对T700/BMI复合材料力学性能的影响,结果表明,随着苯乙烯用量的增加,T700/BMI复合材料的拉伸强度、弯曲强度及层间剪切强度逐渐增大,但苯乙烯用量超过15%(W%)时,拉伸强度呈下降趋势,而弯曲强度和层间剪切强度则继续增大,直到苯乙烯用量超过25%(W%)时,才呈下降趋势。因此,苯乙烯的用量控制在15%～25%(W%)较为合适。

In this paper,the styrene was used as reactive diluent in modified BMI resin to decrease the viscosity of resin,because of its advantage in improving the adhesion property of the fiber and matrix during preparing T700/BMI composite materials.The DSC and IR spectrum testing has been carried out in order to describe the reaction of the styrene,BMI resin and diallylbisphenol A,the DSC curve indicates the curing temperature of the resin is reduced greatly after adding in styrene.In addition,the paper was noticed that the styrene had significant influence on the mechanical properties of T700/BMI composite materials.The results show the tensile strength,flexure strength and interlaminar shear strength of T700/BMI composite materials are enhanced with the increase of the styrene content in resin,but the tensile strength decreases when the styrene content exceeding 15%(W%).On the contrary,the flexure strength and interlaminar shear strength still increase until the styrene content exceeding 25%(W%).Thus the conclusion can be reached that it is the reasonable rate of styrene in resin about 15%~25%(W%).