KH-SiO_2/PES/MBMI-EP复合材料的制备与性能

The Preparation and Properties of KH-SiO_2/PES/MBMI-EP Composites

为了提高双马来酰亚胺树脂(MBMI)的综合性能,扩大其应用范围,以双酚A型环氧树脂(EP)为改性剂,4,4’-二氨基二苯甲烷(DDM)为固化剂,聚醚砜(PES)为增韧剂,硅烷偶联剂KH-550改性后的纳米SiO_2作为无机填料,采用原位聚合法制备了KH-SiO_2/PES/MBMI-EP复合材料,并研究了复合材料的微观形貌、力学性能及耐热性能。红外光谱结果显示:改性后的纳米SiO_2在1555cm^(-1)处出现了N-H弯曲振动吸收峰,证明硅烷偶联剂已接枝到SiO_2表面。SEM结果表明:树脂基体加入PES与纳米SiO_2后,形成了一种多相结构,PES与纳米SiO_2可以协同增韧树脂基体,材料由脆性断裂转变为韧性断裂。力学性能测试表明:随着纳米SiO_2含量的增加,其力学性能呈现先上升后下降的趋势,当纳米SiO_2含量为1.5%时,复合材料的冲击强度及弯曲强度分别达到20.79kJ/m^2和157.23MPa,比树脂基体分别提高了102.2%和53.5%。热失重分析表明:纳米SiO_2的加入有利于提高复合材料的热分解温度,当SiO_2含量为1.5%时,复合材料的热分解温度达到411.3℃,比树脂基体提高了15.8℃。

In order to improve the overall performance of bismaleimide (MBMI)resin matrix composites and expand its application range,the KH-SiO2/PES/MBMI-EP composites were prepared by in-situ polymerization with the bisphenol A type epoxy resin as a modifier,the 4,4'-diamin-odiphenylmethane (DDM)as a curing agent,the polyether sulfone (PES)as a toughening agent,and the silane coupling agent KH-550 modified nano SiO2 as an inorganic filler.The micro-morphology,mechanical properties and heat resistance of the composites were studied.The results of FT- IR showed that the peak of modified nano SiO2 at 1555cm^-1 was the bending vibration absorption peak of N-H bond,it demonstrated that the silane coupling agent had grafted on the surface of SiO2.It could be found from SEM images that a multiphase structure was formed after adding the PES resin and nano SiO2 to the resin matrix.The PES resin and nano SiO2 could synergistically toughen the resin matrix,and the material changed from brittle fracture to ductile fracture.The mechanical properties of the composites showed that the mechanical properties of the composites increased firstly and then decreased with the increase of nano SiO2 content.When the nano SiO2 content was 1.5%,the impact strength and bending strength of the composites reached 20.79kJ/m^2 and 157.23MPa respectively,increased by 102.2% and 53.5% than that of the matrix resin.The thermogravimetric analysis showed that the addition of nano SiO2 was beneficial to raising the thermal decomposition temperature of the composites.When the nano SiO2 content was 1.5%,the thermal decomposition temperature of the composite reached 411.3℃,which was 15.8℃ higher than that of the matrix resin.