定型压力对PES薄膜改性复合材料拉伸性能的影响研究

EFFECT OF THE TACKIFIED PRESSURE ON THE TENSILE PROPERTY OF THE PES FILM MODIFIED COMPOSITES

复合材料以优异的综合性能被广泛用于航空航天和汽车等领域,但高昂的制造成本阻碍了其进一步应用;低成本制造高性能复合材料一直是研究热点。针对真空辅助成型(VARTM)工艺所得复合材料力学性能差的不足,将聚醚砜(PES)薄膜置于预制体纤维层间,在一定温度和定型压力下制得改性预制体,最后采用VARTM工艺制得改性复合材料。研究了0. 1MPa、0. 3 MPa和0. 6 MPa定型压力下所得改性复合材料的拉伸性能,结果表明,与未改性复合材料相比,改性复合材料试样的拉伸强度和模量性能均得到提高。三种定型压力下改性复合材料的拉伸强度分别提高了16. 78%、41. 21%和29. 47%,拉伸模量分别提高了2. 48%、19. 01%和13. 22%,为低成本制造高性能复合材料提供了参考。

The composites have widely used in the aerospace and automotive field for the excellent performance.However,the high cost has hindered its further use and production of the high property composites with low cost has obtained the most concerns.In the present study,the hot-press tackified process was provided to improve the disadvantage of the VARTM of low mechanical property by using the PES(Polyethersulfone)film material interval stacked into the fabrics under certain temperature and pressure to get the modified preforms.Finally,the modified composites were obtained with the VARTM on the modified preforms.The pressures of0.1MPa,0.3MPa and0.6MPa were used to study the effect of tackifier pressure on the tensile strength and modulus on the modified composites,as compared to the unmodified composites.The results indicate that the tensile strength of the modified composites for the three tackifier pressures have improved by16.78%,41.21%and29.47%respectively,and the tensile modulus have improved by2.48%,19.01%and13.22%,which provide the guidance to obtain the high performance composites with low cost process of VARTM.