Synthesis and Application of Polyolefins and Polyolefin Nanocomposites

• Main Authors: Wei-Ta Yang, 楊偉達
• Other Authors: George J. Jiang
• Format: Others
• Language: en_US
• Published: 2003
• Online Access: http://ndltd.ncl.edu.tw/handle/h9xvt2

博士 === 中原大學 === 化學研究所 === 91 === The research focuses on improving the properties and applications of polyolefin. It contains two parts. In the first part, polyolefin and functional polyolefin were prepared by metallocene and the Brookhart-type catalyst system. The high-density-polyethylene was prepared by the rec-Et(Ind)2ZrCl2/MAO catalyst system. The low-density polyethylene was prepared by the Brookhart-type catalyst, N4Ni2Cl4, /MAO catalyst system. The functional polyethylene was prepared by copolymerization of ethylene and 9-decene-1-ol or 11-chloro-undecene. The quantity of hydroxyl group of the poly(ethylene-co-9-decene-1-ol) prepared by rec-Et(Ind)2ZrCl2/ MAO catalyst system can reach 2.19 mol%. It was also modified to poly(ethylene-co-vinyl mercaptoacetate) graft from this copolymer and then formed PE-g-PMMA. The quantity of chloro group in the poly(ethylene-co-11-chloro-undecene) prepared by N4Ni2Cl4 /MAO catalyst system can reach 9.8 mol%. The polystyrene and functional polystyrene were prepared by N2NiCl2 and N4Ni2Cl4/ MAO catalyst system. The functional polystyrene was prepared by copolymerization of styrene and 4-chloromethyl styrene. The quantity of chloromethyl group of the poly(styrene-co-4-chloromethyl styrene) prepared by N4Ni2Cl4/ MAO catalyst system can reach 13.99 mol%. The PMMA was grafted from the chloromethyl group in the poly(styrene-co-4-chloromethyl styrene) by atomic transfer radical polymerization (ATRP) to form PS-g-PMMA. In the second part, an in situ, emulsion and suspension polymerization was used to prepare for polystyrene/clay and poly(methyl mathacrylate)/clay nanocomposite. The in situ polymerization was use the N4Ni2Cl2 catalyst to support onto the clay layers to prepare polystyrene/clay nanocomposite. There were two different source of clay, PK-802 and Closite® Na+, one and two alkyl substituent quaternary ammonium salt modify clay was used to prepared PS/clay and PMMA/clay nanocomposite. The effect of different clays and modification agents in the nanocomposites were studied. The thermal and mechanical properties were shown significantly increased with clay dispersed in the polymer matrix.