PET/SiO2/TiO2纳米复合材料的合成及其光降解性能研究

采用溶胶-凝胶法制备了聚对苯二甲酸乙二醇酯（PET）／二氧化硅（SiO2）／二氧化钛（TiO2）纳米复合材料，利用红外光谱（IR）、乌氏黏度计表征了该复合材料的分子结构和特性黏度，并测定其在紫外光下的光降解性能．实验表明，PET／SiO2／TiO2体系中存在Si—O—Ti键，并与PET基体作用形成PET／SiO2／TiO2纳米复合材料；该复合材料的特性黏度随体系中SiO2-TiO2含量增加而降低；在紫外光下，SiO2和Ti02纳米颗粒的引入可有效地提高PET的光降解性能．

Study on the synthesis and photo-degradation of poly (ethylene terephthalate)/SiO2/TiO2 hybrid composites

Poly （ethylene terephthalate） （PET） SiO2/TiO2 hybrid composites were synthesized via the Sol - Gel method. The structures and the intrinsic viscosity of the hybrid composites were thoroughly characterized by Fourier transform infrared spectroscopy （ FT - IR） and an Ubbelohde viscometer. The photo - degradation properties of hybrid composites were investigated under the ultraviolet radiation. The formation of Si - O - Ti bonds in the resulting products was confirmed by FT - IR analysis. It was obvious that the intrinsic viscosity for the hybrid composites decreased with the increment of SiO2 - TiO2 contents. The photo - degradation experiments of hybrid composites indicated that the introducing of SiO2 - TiO2 nanoparticles can improve the photo - degradation properties of PET under the ultraviolet radiation.