聚醚醚酮和烯丙基化合物改性双马来酰亚胺复合材料微观结构及力学性能

Microstructure and mechanical properties of bismaleimide composites modified with poly(ether ether ketone) and allyl compounds

采用浓H2SO4氧化聚醚醚酮(PEEK)得到磺化聚醚醚酮(SPEEK),以3,3’-二烯丙基双酚A(BBA)、双酚A双烯丙基醚(BBE)为活性稀释剂、SPEEK为改性剂、双马来酰亚胺(BMI)树脂为基体,浇注成型制备SPEEK/BBA-BBE-BMI复合材料,同时研究了SPEEK的改性效果及复合材料微观形貌与力学性能。结果表明:SPEEK改性效果较好,在FTIR中存在明显的磺酸基团特征峰,SEM和能谱分析表明,SPEEK微观形貌变化明显,硫元素含量较高;SPEEK/BBA-BBE-BMI复合材料的微观形貌显示,SPEEK在基体中呈现直径为2μm左右的多孔状两相结构,且分散均匀,此多孔结构改善了复合材料的断裂形貌,由脆性断裂转变为韧性断裂,当断裂纹遇到SPEEK组分时受阻而出现不规则发散,此变化会赋予复合材料更加优异的性能。力学性能测试结果显示,当SPEEK含量为5wt%时,SPEEK/BBA-BBE-BMI复合材料的弯曲强度和冲击强度达到最佳,分别为147.93MPa和15.74kJ/mm^2,分别比基体提高了49.47%和66.21%。

Sulfonated poly（ether ether ketone）（SPEEK）was obtained by modifying poly（ether ether ketone）（PEEK）with concentrated H2 SO4.the SPEEK/BBA-BBE-BMI composites were cast-molded,with bismaleimide（BMI）resin as the matrix,3,3’-diallyl bisphenol A（BBA）and bisphenol A diallyl ether（BBE）as the reactive diluent,SPEEK as the modifier.The effects of SPEEK on the composites were studied.The micro-structure and mechanical properties of the SPEEK/BBA-BBE-BMI composites were examined.The results show that SPEEK produces better modification effect and obvious characteristic peaks of sulfonic acid groups appear in FTIR.SEM and EDS analysis reveale that the micro-structure changes clearly and the content of sulfur element is higher.The micro-structure of SPEEK/BBA-BBE-BMI composite displays that the SPEEK exhibits a porous two-phase structure with a diameter of about 2μm in the matrix.The＂honeycomb＂structure changes the fracture morphology from brittle to ductile fracture.The irregular divergence occurre when the breakage encounters the SPEEK component,and this change could supply the composite more excellent properties.The results of mechanical properties for composite indicate that the flexural strength and impact strength of SPEEK/BBA-BBE-BMI composite with 5 wt%SPEEK are the best（147.93 MPa and 15.74 kJ/mm2）,49.47% and 66.21% higher than that of the matrix,respectively.