【摘要】 以双酚 A 环氧树脂（E51）为基料、聚醚胺（D-230）为固化剂、含巯基聚硅氧烷（PMMS）为改性剂，分别经过简单物理混合和化学改性的方法，制备了一系列聚硅氧烷改性环氧树脂（E51-D-PMMS）固化物。通过衰减全反射红外（ATR-FTIR）和 X 射线衍射仪（XRD）表征了固化物的结构特征；通过拉伸测试和冲击实验、扫描电子显微镜（SEM）、接触角测量（CA）、动态热力学分析（DMA）及中性盐雾实验探究了改性固化物的力学性能、热稳定性、防腐性能等。结果表明，化学改性的E51-D-PMMS固化物的综合物理化学性能优于简单物理改性的，当PMMS含量为1 %（质量分数，下同）时，改性固化物的拉伸强度为 74. 63 MPa，较改性前提高了 13. 5 %，断裂伸长率提高了 40. 2 %，冲击强度提高了43. 7 %；水接触角从改性前的 72. 8 °增至 100. 3 °，表面能从 39. 4 J/m~2降至 17. 4 J/m~2，吸水率下降了 44 %，耐水性能大大增强；其防腐性能和玻璃化转变温度（T_g）也有一定的提升。更多还原

【Abstract】 In this article,a series of polysiloxane epoxy composites were prepared through physical mixing and chemical modification methods using epoxy resin(E51)as a base material,amino-terminated polyoxypropylene(D-230)as a curing agent,and mercaptan polysiloxane(PMMS)as a modifier. The chemical structure of the cured epoxy resins were characterized using attenuated total reflection infrared spectroscope and X-ray diffractometer,and their mechanical properties,thermal stability and anti-corrosion performance were investigated through tensile and impact tests,scanning electron microscopy,contact angle measurement,dynamic thermomechanical analysis,and neutral salt spray test. The results indicated that the cured epoxy resins exhibited better comprehensive properties that the conventional epoxy resin.The cured epoxy resins containing 1 wt% PMMS obtained tensile strength of 74. 63 MPa,which was 13. 5 % higher than that before modification. Compared to neat pure E51,the polysiloxane epoxy resins showed an increase in elongation at break by 40. 2 % and in impact strength by 43. 7 %. The contact angle of the cured epoxy resins increased from72. 8 ° to 100. 3 °,their surface energy decreased from 39. 4 J/m~2 to 17. 4 J/m~2,their water absorption rate decreased by 44 %,and their water resistance was enhanced greatly. In addition,their anti-corrosion performance and T_g were also improved.更多还原