“离位”增韧技术在碳纤维/RTM聚酰亚胺复合材料中的应用  

Application of carbon fiber/RTMable polyimide composites by ex-situ toughness method

作　　者：刘志真[1] 郭恩玉[2] 邢军[1] 李宏运[1] 益小苏[1] 王震[3] 于洋[4] 

机构地区：[1]北京航空材料研究院先进复合材料国防科技重点实验室,北京100095 [2]中国人民解放军驻5716厂军事代表室,山西048000 [3]中国科学院长春应用化学研究所高分子工程实验室,长春130022 [4]沈阳发动机设计研究所,沈阳110015

出　　处：《复合材料学报》2010年第6期1-8,共8页Acta Materiae Compositae Sinica

基　　金：国家973项目(2010CB63110);重点实验室基金(KZ42092823)

摘　　要：研究了"离位"增韧对RTM聚酰亚胺(PI-9731)树脂基复合材料力学性能的影响。结果表明:当增韧剂的质量分数为15%时,经粉末法和薄膜法"离位"增韧G827/PI-9731复合材料的室温层间剪切强度从增韧前的97.9 MPa分别提高到108 MPa和110 MPa,高温(288℃)层间剪切强度变化不大。G827/PI-9731复合材料经粉末法"离位"增韧后,Ⅰ型断裂能释放率从增韧前的310 J/m2提高到410 J/m2,Ⅱ型断裂能释放率从增韧前的590 J/m2提高到939 J/m2。而经过薄膜法"离位"增韧后,其复合材料的Ⅰ型断裂能释放率提高到459 J/m2,Ⅱ型断裂能释放率提高到1100 J/m2。经电镜分析表明,由于热塑性聚酰亚胺的引入,在复合材料层间区域形成热固/热塑相反转结构,在裂纹扩展的过程中,包覆热塑性聚酰亚胺的PI-9731粒子发生明显取向和变形,从而提高韧性。The effect of ex-situ method on the mechanical properties and toughness of the RTMable carbon fiber（G827）/polyimide（PI-9731）composites was studied.The results show that the interlaminar shear strength of G827/PI-9731 composites toughened by the ex-situ methods with powder and film increases from 97.9MPa to 108MPa and 110MPa,respectively,when the thermoplastic PI mass fraction is 15% at room temperature.However,the interlaminar shear strength changes slightly at high temperature（288℃）.The mode Ⅰ fracture toughness of G827/PI-9731 composites toughened with powder method is improved from 310J/m2 to 410J/m2.The Mode Ⅱ fracture toughness is improved from 590J/m2 to 939J/m2.However the mode Ⅰ fracture toughness of G827/PI-9731 composites toughened with film method increases to 459J/m2.The mode Ⅱ fracture toughness is improved to 1100J/m2.By SEM analysis,it is found that the toughness improvement results from the introduction of thermoplastic PI and the formation of the TP/TS phase inversion structure in the interlaminar regions,in which the PI-9731 particles wrapped by thermoplastic PI will be orientated and deformed in the process of crack extension.

关 键 词：聚酰亚胺 复合材料 RTM成形 “离位”增韧 力学性能 

分 类 号：TB332[一般工业技术—材料科学与工程]