Modification on silica surface with metal complex fo polymerization study

• Main Authors: Jung-Hua Lee, 李榮華
• Other Authors: Shiuh-Tzung Liu
• Format: Others
• Language: zh-TW
• Published: 2000
• Online Access: http://ndltd.ncl.edu.tw/handle/01533792669438154865

碩士 === 國立臺灣大學 === 化學研究所 === 88 === Immobilized catalysts have potential industrial importance because of its easy seperation and eco-friendly nature. We used the sol-gel process to synthesize [RSiO3/2] and [R-SiO3/2]x[SiO4/2]y from R-Si(OMe)3 and a mixture of R-Si(OMe)3 and Si(OMe)4 (R can be a diimine ligand/precursor or metal complex) respectively. Catalytic reactions were carried out using these systems. How to form smooth silica spheres and modification of silica particles were discussed in this research. The modification of macromolecule on the silica surface was also investigated in this work. The modified silica used in catalytic polymerization appears to be low activity, due to the unstability of diimines ligand on the silica surface, which decompose upon hydrolysis. A new Pd(II) complex was synthesized with bidentate P∩N ligand and was characterized by single crystal X-ray structural determination. The complex was used in polymerization of norbornene and found to be very slow. However, the activity this complex towards polymerization of norbornene were improved by the addition of MAO cocatalyst. The structure of these polymers were identified by IR, EA, and solid state NMR.