摘要
在双马来酰亚胺/二元胺/改性剂A预聚体系中加入环氧丙烯酸树脂,制备了一种可用作耐热复合材料基体的改性双马来酰亚胺树脂。用DSC研究了该树脂基体的反应特性,并制定出了合适的固化工艺参数:改性树脂基体经140℃/1 h+160℃/1 h+180℃/2 h初固化,于220℃/8 h后固化处理,其热变形温度(HDT)为245℃;该树脂与玻璃纤维制备的单向复合材料层压板的室温拉伸强度、弯曲强度和层间剪切强度分别为1 030 MPa、1 600 MPa和92．1 MPa;180℃下测得弯曲强度保持率为67．8%,层间剪切强度保持率为63．2%,用DMA法测得T_g为273℃。
A modified bismaleimide for heat-resistant composite material matrix is prepared by adding epoxy acrylate resin to bismaleimide/diamine/modifier A prepolymer. The resin matrix has good dissolvability and good reserved stability at room temperature in acetone. The reaction character of the resin is studied by DSC and made the curing paramenters are determined： the heat distortion temperature of modified resin matrix is 245℃, by precure at 140℃/1 h ＋ 160℃/1 h ＋ 180℃/2 h and postcure at 220℃/8 h; the tensile strength, flexural strength and interlami- nar shear strength of the glass fibre reinforced unilateral laminates are 1 030 MPa, 1 600 MPa and 92.1 MPa respectively at room temperature ; the retention ratio of flexural strength and interlaminar shear strength are 67.8% and 63.2% at 180℃ respectively, its Tg is 273℃ tested by DMA.
出处
《宇航材料工艺》
CAS
CSCD
北大核心
2007年第2期22-25,共4页
Aerospace Materials & Technology
