聚丙烯腈基预氧丝毡复合材料的力学性能研究

为了制备拉伸和弯曲性能良好的聚丙烯腈基预氧丝毡/环氧树脂复合材料,研究了聚丙烯腈基预氧丝毡含量和固化温度对复合材料拉伸和弯曲性能的影响,优化出力学性能最佳的聚丙烯腈基预氧丝毡/环氧树脂复合材料制备方法,并拍摄了复合材料拉伸断口的SEM图像.研究表明:当聚丙烯腈基预氧丝毡含量为15%时,其纵向和横向的拉伸断裂载荷达到最大值,分别为1 643.73和1 235.72 MPa;同时纵向和横向弯曲强度也达到最大值,分别为64.39和53.06 MPa;复合材料的SEM图像显示,纵向拉伸断口处有少量裸露纤维,其分布方向与针刺毡铺网方向一致.

Study on the mechanical properties of PAN-based pre-oxidized fiber felt composite material

In order to prepare PAN-based pre-oxidized fiber felt composite materials with good tensile and bending properties, effects of the content of PAN-based pre-oxidized fiber felt and the curing temperature on their properties were studied to optimize the preparation method of epoxy resin composite materials. And tensile fracture surfaces were investigated using SEM images. Results showed that the longitudinal and transverse tensile breaking load reached maximum values with 1 643.73 MPa and 1 235.72 MPa respectively when the mass of PAN-based pre-oxidized fiber is 15% of that of epoxy resin. Meanwhile, the longitudinal and transverse bending strength reached the maximum values of 64.39 MPa and 53.06 MPa, respectively. SEM images of composite material showed a little bare fiber remained on the longitudinal tensile fracture surfaces, and the direction of the distribution of fiber was identical to the net of needled felt.