溶胶-凝胶法制备TiO2/PMMA纳米复合材料的研究

摘要

通过溶胶-凝胶法制备了TiO2溶胶,与聚甲基丙烯酸甲酯(PMMA)进行杂化处理制得了TiO2/PMMA纳米复合材料.并将不同量的溶胶与几种不同摩尔质量的PMMA进行复合,得到多种样品.通过透射电镜(TEM)、红外光谱(FTIR)、紫外-可见光谱(UV-Vis)、热失重(TGA)分析研究了TiO2/PMMA纳米复合材料的结构和性能,从而由溶胶含量、PMMA摩尔质量等不同因素对复合材料性质产生的影响作出了解释.结果表明当溶胶含量为1％、PMMA的摩尔质量较低(37.3万g/mol)时,TiO2微粒在聚合物中的分散性较好,粒径较均一,TiO2的加入使得材料的抗紫外线性和热稳定性都有所提高.%This paper used the method of sol-gel to prepare TiO2 sol and hybridized it into PMMA to ac quire TiO2/PMMA nanocomposite. In this way it can be obtained various samples through making amounts of sol with various molecular weight of PMMA composite. The TiO2/PMMA nanocomposite's structure and per formance was analyzed through TEM, FTIR, UV-Vis and TGA and the paper tried to give the explanation a bout the effect of sol content and PMMA molecular weight on different properties of these samples. The result indicate when the amount of sol contained 1 % and the molecular weight of PMMA was relatively low ( 3. 73 million g/mol) , the TiO2 particles' dispersion in PMMA was better. The material's properties of UV resist ance and thermal stability were improved by the accession of TiO2.