摘要:
以钛酸异丙酯( Ti (OPri )4) 、锆酸正丁酯(Zr (OC4H9 )4) 为无机前驱物原料, γ-甲基丙烯酰氧基丙基三甲氧基硅烷(MSMA) 为偶联剂, 通过原位溶胶-凝胶法成功制备了透明的纳米TiO2-ZrO2/Poly(MMA-co-MSMA) 复合材料。通过红外(FTIR)、紫外(UV)、椭圆偏振光谱仪、扫描电镜(SEM) 和热重分析仪( TGA) 等手段对纳米复合材料进行了表征。研究发现, 复合材料的折射率显著提高, 随着TiO2-ZrO2无机氧化物含量的增加, 633 nm处折射率从1. 491 升高到1. 579 。随着无机组分的增加, 紫外吸收增强, 复合材料中纳米粒子粒径增大, 从20～30nm增加到80～90 nm, 但复合材料块体始终保持透明。复合材料的热稳定性有明显提高, 800 ℃最高残炭率随着无机物含量的增加而增大, 最高达71 %。
Abstract:
Transparent nano TiO2-ZrO2/Poly(MMA-co-MSMA) organic-inorganic composite was prepared by an in situ sol-gel process with methyl methacrylate (MMA) and 3-(trimethoxysilyl) propyl methacrylate (MSMA) as couplingagents. Titanium isopropoxide and zirconium n-tetrabutanoxide were used for the synthesis of the titania-zirconia network. The composite was characterized by Fourier transform infrared spectroscopy (FTIR), ultraviolet spect rophotometer (UV), Spectro-Ellipsometer, scanning electron microscope (SEM) and thermo-gravimetric analysis (TGA). With the increase of the TiO2-ZrO2 inorganic content, the refractive indices also promote and ultraviolet absorption becomes stronger. At the same time, the nanoparticles size increases from 20～30 nm to 80～ 90 nm and the composite still keeps transparency. Nanocomposite heat resistance shows conspicuous improvement. The highest carbon yield at 800 ℃ improves with the increase of the inorganic content and the best result is 71 %.
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