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- 2016
SCE-SiO2/PES-MBAE复合材料微观形貌及性能
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Abstract:
为研究增韧双马来酰亚胺方法及其对性能的影响，首先利用超临界乙醇处理纳米SiO2（SCE-SiO2），改善其表面活性；然后以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）、双酚A双烯丙基醚（BBE）为原料合成了MBMI-BBA-BBE （MBAE）复合材料基体，并利用原位聚合法和溶胶-凝胶法将SCE-SiO2和聚醚砜（PES）加入MBAE基体中制备了SCE-SiO2/PES-MBAE多相复合材料；最后采用SEM观察了SCE-SiO2/PES-MBAE复合材料断面形貌。SCE-SiO2的FTIR分析结果表明：在3 434 cm-1处的Si—OH的吸收峰消失，出现了3 310 cm-1处的乙醇分子间—OH的吸收峰、2 984 cm-1处的甲基和亚甲基的吸收峰，证明纳米粒子可能以某种形式结合了乙醇分子，改善了表面性能。PES以"蜂窝"状分散相的形式存在于基体中，断裂方式由脆性断裂向韧性断裂转变，SCE-SiO2和PES对材料均有增韧作用，PES的增韧效果更明显，二者之间具有协同作用，当SCE-SiO2含量为2wt% 、PES含量为4wt%时，多相复合材料的冲击强度和弯曲强度分别为15.02 kJ/m2和130.47 MPa，较MBAE树脂分别提高了57.3%和35.8%。介电性能测试表明：SCE-SiO2和PES的引入均会导致SCE-SiO2/PES-MBAE复合材料的介电常数和损耗略有上升，但二者之间的协同作用可以抑制PES组分所带来的负面影响。 In order to research the method of toughening bismaleimide and its effects on properties, nano-SiO2 was modified by supercritical ethanol (SCE-SiO2), and its surface activity of SCE-SiO2 were improved, 4,4'-diamino diphenyl methane bismaleimide (MBMI), 3,3'- diallyl bisphenol A (BBA) and bisphenol-A diallyl ether (BBE) were used to synthesize MBAE(MBMI-BBA-BBE) composite matrix, SCE-SiO2/PES-MBAE multi-phase composite was prepared from adding SCE-SiO2 and polyether sulfone (PES) into MBAE matrix by in-situ polymerization method and sol-gel method. SEM was used to observe the fracture morphology of SCE-SiO2/PES-MBAE composites. The analysis result of FTIR shows that the absorption peak of Si—OH at 3 434 cm-1 disappeares and the absorption peaks of —OH between ethanol molecules (3 310 cm-1), —CH3 and —CH2— (2 984 cm-1)appeares, this indicates the nano particle is coated with ethanol molecule in some form and surface properties improve. PES exists in the matrix as dispersed phase in the form of "honeycomb", the fracture modes transform from brittle fracture to ductile fracture. SCE-SiO2 and PES have the toughing effect to the material, the toughing effect of PES are extremely obvious, and there are synergistic between them. When the content of SCE-SiO2 is 2wt%, PES content is 4wt%, the impact strength and the bending strength of multi-phase composites are 15.02 kJ/m2 and 130.47 MPa, enhance 57.3% and 35.8% than that of MBAE matrix, respectively. The dielectric property test shows that the dielectric constant and dielectric loss of SCE-SiO2/PES-MBAE composites show a little increase while SCE-SiO2 and PES exist, but the synergistic reaction between them can reduce the negative impacts of PES. 哈尔滨市科技局创新人才专项（2015RAXXJ029）
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