一种低粘度双马树脂及其复合材料的性能研究

STUDY ON THE PROPERTIES OF A BISMALEIMIDE RESIN WITH LOW VISCOSITY AND ITS COMPOSITE

对一种适用于RTM工艺的低粘度双马树脂QY8911-Ⅳ进行了研究,考察了树脂体系的粘度特性和固化特性,并对不同后固化温度下的树脂固化物的耐热性、力学性能及吸水性等进行了全面考察。结果表明,该树脂体系具有粘度低(80℃为200mPa·s)、固化收缩小(1%)、耐热性好(T_g为260℃)、力学性能好(弯曲强度为170 MPa、冲击强度为20 kJ/m^2)和吸水率低(0.39%)等特点。选择合适的注射工艺和固化工艺,以此树脂为基体,采用RTM工艺,制备出了碳布增强的复合材料,并对其力学性能进行了测试,其弯曲强度和冲击强度分别为754 MPa和110.9 kJ/m^2。

The properties of a bismaleimide resin QY8911-Ⅳ with low viscosity for resin transfer molding（ RTM） were reported in this work. Its viscosity characteristic and curing characteristic were studied firstly. The heat resistance,mechanical properties and water absorption of the resin cast cured at different post-curing temperatures were investigated and compared. The results suggest that this resin system show good performance including low viscosity（200 mPa·s at 80 ℃）,low curing shrinkage（1%）,good heat resistance（a T_g of 260 ℃）,good mechanical property（flexural strength is 170 MPa and impact strength is 20 kJ/m^2） and low water absorption（0.39%）.The appropriate injection process and curing process were selected to prepare the carbon fiber reinforced composites by RTM,and the mechanical properties of the composites were tested. The flexural modulus is 754 MPa and the impact strength is 110. 9 kJ/m^2.