【摘要】 以聚乙二醇(PEG-2000)、甲苯二异氰酸酯(TDI)为原料合成预聚体,然后以3-氨基丙烷乙氧基硅烷(WD-50)对其封端,合成含有柔性链的硅烷偶联剂。并以其为改性剂,用溶胶-凝胶方法制备了EP/SiO2-TiO2纳米复合材料,利用红外光谱、动态粘弹谱仪、X射线衍射、冲击实验机、扫描电镜和原子力显微镜等手段研究了这种材料的结构与性能。结果表明,与纯环氧树脂相比,改性材料的冲击强度提高了2～3倍,并具有较高的模量和热性能,玻璃化转变温度仅发生微小的变化。更多还原

【Abstract】 Siloxane coupling agent was synthesized by 3-aminopropyl triethyloxysiliane（WD-50） and prepolymer, which was synthesized from polyethylene glycol （PEG-2000） and toluene disocyanate. EP/SiO₂-TiO₂ nanocomposite has been prepared by a sol-gel method using prepolymer as modifier. The structure and properties of the nanocomposite was characterized by FT-IR spectroscopy, measurement viscoelasticity, XRD diffraction patterns, impact property, scanning electron microscope and atomic force microscope etc. The results show that the impact strength of the modified systems are 2³ times higher than that of the unmodified systems, while the high modulus and good thermal properties are maintained, and the glass transition temperatures are little altered.更多还原