Synthesis of Novel Catalyst Based on TiO_2/SiO_2 for Poly(ethylene terephthalate)

A novel catalyst for the polycondensation of PET based on TiO2/SiO2 sol was synthesized.The composition of the catalysts was characterized by electron probe micro-analyzer(EPMA) and thermogravimetric analysis(TGA) methods.The results indicate that the composition of the catalysts can be well controlled and match well with theoretical values.X-ray photoelectron spectroscopy(XPS) results reveale that caprolactam added into the catalyst has coordinative effects with Ti and gives the catalyst ultra-high activity.The PET products catalyzed by the catalyst with caprolactam had far better properties than those synthesized using traditional antimony based catalysts.