为研究聚醚砜(PES)增韧双马来酰亚胺(BMI)与环氧树脂(EP)体系的微观结构与性能,采用原位聚合法制得PES/BMI-EP复合材料.通过FTIR和SEM分析可知PES未与BMI-EP树脂发生化学反应,而是与BMI-EP分子间存在强烈的相互作用,并以两相结构存在,是多相复合材料.在PES/BMI-EP复合材料中,PES为分散相,相与相之间界面模糊,其断面裂纹不光滑方向发生改变,为典型的韧性断裂形貌;能谱测试结果证明PES与基体间存在相互渗透现象,PES均匀的分散于基体树脂中.力学测试分析结果显示:当PES含量为4 wt%时,PES在基体树脂中分散性较好,其弯曲强度与冲击强度达到最高,为144.9 MPa和19.7 kJ/m2,比BMI-EP基体树脂分别提高41.2%和90%;热失重测试结果显示,适量的PES能提高PES/BMI-EP复合材料的分解温度,过量添加不利于材料分解温度的升高.
In order to study micro-structure and properties of composite,polyether sulfone/bismaleimide-epoxy composite was prepared by in-situ polymerization.The results of FTIR and SEM show that PES do not react chemical reaction with BMI-EP,PES is existence of two-phase structure in composite and has very strong interaction with BMI-EP matrix.PES presente as disperse phase in matrix,the interface of PES and matrix is fuzzy.The failure crack is not smooth and the direction is changed,it is typical ductile fracture when PES is added into the polymer matrix.The energy spectrum analysis show that PES is mutual penetration phenomenon with matrix and PES is uniformly dispersed in the matrix.The results of mechanical properties indicated that the toughening effect of PES resin are extremely obvious,when the content of PES is 4 wt%,the bending strength and the impact strength of PES/BMI-EP are 144.9 MPa and 19.7 kJ/m2,41.2% and 90% higher than that of BMI-EP matrix,respectively.The thermogravimetric results prove that appropriate amount of PES can improve the heat resistance of PES/BMI-EP composite,and the excessive amount of PES resin is not conducive to the decomposition temperature of the material.
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