蒙脱土/聚醚砜-双马来酰亚胺复合材料微观形貌及性能

Micro-morphology and properties of modified MMT/PES-MBAE composite

采用十八烷基三甲基氯化铵(OTAC)作为改性剂、通过离子交换法制备了改性蒙脱土(OTAC-MMT);以4,4'-二氨基二苯甲烷双马来酰亚胺(MBMI)、3,3'-二烯丙基双酚A(BBA)及双酚A双烯丙基醚(BBE)为原料制备了复合材料基体(MBAE);利用原位聚合法将OTAC-MMT和聚醚砜(PES)掺杂基体中制备OTAC-MMT/PES-MBAE复合材料。XRD结果分析表明:OTAC-MMT层间距相对于Na-MMT有明显增大。SEM微观形貌显示:OTAC-MMT片层结构更加明显且分散均匀;复合材料的表面更加粗糙,改性蒙脱土分散均匀,PES与基体树脂呈两相结构,出现了向不同方向发展的银纹和微裂纹,呈韧性断裂。当OMMT质量分数为2%、PES为3%时,OTAC-MMT/PES-MBAE复合材料的冲击强度和弯曲强度分别为14.54 kJ·m-2和149.12 MPa,较MBAE树脂分别提高了55.5%和47.2%。介电性能测试表明:OTAC-MMT/PES-MBAE复合材料介电常数和损耗略有上升,但仍满足材料的使用要求。

Cetyltrimethyl ammonium chloride(OTAC)as modifier,modified montmorillonite(OTAC-MMT)was prepared via cation exchange.4,4'-diamino diphenyl methane bismaleimide(MBMI),3,3'-diallyl bisphenol A(BBA)and bisphenol-A diallyl ether(BBE)were used to synthesize MBAE matrix,OTAC-MMT/PES-MBAE composites were prepared from MBAE,OTAC-MMT and PES by in-situ polymerization method,respectively.The XRD result revealed that the interlayer spacing of OTAC-MMT increase obviously,which compared with Na-MMT.The SEM micro-morphology displayed that the layer structure of OTAC-MMT was more apparent and dispersed uniformly,the surface of composites were more rough than that of MBAE,PES and MBAE matrix presented two-phase,crazing and microcrack which direct in different directions were appeared,exhibited ductile fracture.When the mass fraction of OTAC-MMT was 2%,PES content was 4%,the impact strength and the bending strength of OTAC-MMT/PES-MBAE were 14.54 kJ·m?2 and 143.12 MPa,enhance 55.5%and 47.2%than that of MBAE matrix,respectively.The dielectric constant and loss of the composite material showed a little increase while OTAC-MMT and PES exist,but OTAC-MMT could reduce the negative impacts of PES.