建筑用碳纤维增强环氧树脂复合材料的制备及其性能研究

Preparation and properties of carbon fiber reinforced epoxyresin composites for construction

选择以T700碳纤维为增强相,将碳纤维经浓HNO 3浸渍处理0,40,80,120和160 min后掺入到环氧树脂中,制备了碳纤维增强环氧树脂复合材料。分析了浸渍时间对复合材料微观形貌、力学性能和热稳定性的影响。结果表明,经浓HNO 3浸渍的碳纤维表面粗糙度增大,沟槽数量和深度增加,碳纤维和环氧树脂的结合强度增大;随碳纤维浸渍时间的增大,复合材料的界面剪切强度、层间剪切强度、弯曲强度和弯曲模量均先增大后减小,当浸渍时间为120 min时,复合材料的界面剪切强度和层间剪切强度均达到了最大值,分别为80.2和90.3 MPa,其弯曲强度和弯曲模量也达到了最大值,分别为902.6 MPa和79.3 GPa,且应力-应变最高点增大,弯曲性能提高;在800℃下浓HNO 3浸渍处理120 min的复合材料的残炭率最大为58.2%,热稳定性最佳。

T700 Carbon fiber was selected as the reinforcing phase,and the carbon fiber was impregnated with concentrated HNO 3 for 0,40,80,120 and 160 min and then mixed into epoxy resin to prepare carbon fiber reinforced epoxy resin composites.The effects of impregnation time on the microstructure,mechanical properties and thermal stability of the composites were analyzed.The results showed that the surface roughness of carbon fiber impregnated with concentrated HNO 3 increased,the number and depth of grooves increased,and the bonding strength between carbon fiber and epoxy resin increased.The interfacial shear strength,interlaminar shear strength,flexural strength and flexural modulus of the composites first increased and then decreased with the increase of carbon fiber impregnation time.When the impregnation time was 120 min,the interfacial shear strength and interlaminar shear strength of the composite reached the maximum,which were 80.2 and 90.3 MPa respectively.The bending strength and bending modulus also reached the maximum value,which were 902.6 MPa and 79.3 GPa respectively.The highest point of stress-strain increased,and the bending performance improved.The maximum carbon residue rate of the composite treated with concentrated HNO 3 at 800℃for 120 min was 58.2%,and the thermal stability was the best.