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- 2015
超临界氧化铝/聚醚砜-BMI-BBA-BBE复合材料的微观结构与耐热性
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Abstract:
利用超临界乙醇修饰纳米Al2O3, 得SCE-Al2O3, 使其表面沉积活性基团; 以4, 4'-二氨基二苯甲烷双马来酰亚胺(BMI)为基体、3, 3'-二烯丙基双酚A(BBA)和双酚A双烯丙基醚(BBE)为活性稀释剂、聚醚砜(PES)为增韧剂、SCE-Al2O3为改性剂, 通过原位聚合法合成了SCE-Al2O3/PES-BMI-BBA-BBE复合材料。采用SEM和FTIR观察分析了SCE-Al2O3纳米粒子和PES的增韧机制。结果表明: SCE-Al2O3纳米粒子处理时间不宜过长, 5 min为宜; FTIR显示在3 457 cm-1附近的—OH吸收峰增强, 说明粒子表面沉积了活性基团—OH; PES与BMI-BBA-BBE呈现两相结构, PES树脂以"蜂窝"状均匀分散在聚合物基体BMI-BBA-BBE中, PES用量增加会使其粒子尺寸增大, 适宜用量为5wt%。 SCE-Al2O3/PES-BMI-BBA-BBE复合材料的耐热性能测试结果显示: PES树脂会使材料的热分解温度降低, 但SCE - Al2O3会提高材料的耐热性能, 4wt% SCE-Al2O3/PES-BMI-BBA-BBE的热分解温度为444.41 ℃, 较基体树脂提高了20.52 ℃, 600 ℃时残重率为47.64%, 提高了7.09%。 Nano-Al2O3 was modified by supercritical ethanol (SCE-Al2O3) and the surface of SCE-Al2O3 was coated with active group. 4, 4'-diamino diphenyl methane bismaleimide (BMI) was used as matrix, 3, 3'-diallyl bisphenol A (BBA) and bisphenol-A diallyl ether (BBE) were used as reactive diluent, polyether sulfone (PES) as toughening agent and SCE-Al2O3 as modifier, SCE-Al2O3/PES-BMI-BBA-BBE composites were prepared through in-situ polymerization method. The toughening mechanisms of SCE-Al2O3nano particles and PES were observed and analyzed by SEM and FTIR. The results show that the processing time of SCE-Al2O3nano particles should not be too long(5 min is appropriate). FTIR shows that the characteristic peak of —OH at 3 457 cm-1 is enhanced and indicates that the surface of Al2O3 is coated with reactive group —OH. PES presentes as two-phase structure in BMI-BBA-BBE matrix, PES resin disperses in polymer matrix with "honeycomb" shape evenly and the size of "honeycomb" enlarges with the increasing of PES content (5wt% is appropriate). Results of heat resistance of composites show that the thermal decomposition temperature would decline when BMI-BBA-BBE matrix mixed with PES, and SCE-Al2O3 could enhance the thermal stability of composites. The thermal decomposition temperature of 4wt% SCE -Al2O3/PES-BMI-BBA-BBE is 444.41 ℃, which is 20.52 ℃ higher than that of matrix resin. Rate of residual mass at 600 ℃ is 47.64%, enhanced by 7.09%. 黑龙江省教育厅资助项目(11551071);哈尔滨市人才创新基金(2012RFJGG006)
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