Effects of Structure of the Bridge on Polymerization Behavior of Dinuclear Constrained Geometry Catalysts and Properties of Ethylene-Styrene Copolymers

Title
Effects of Structure of the Bridge on Polymerization Behavior of Dinuclear Constrained Geometry Catalysts and Properties of Ethylene-Styrene Copolymers
Author(s)
노석균팜나탄누옌티듀휴옌웽티레탄
Keywords
HALF-TITANOCENE COMPLEXES; RADICAL POLYMERIZATION; METALLOCENE; MECHANISM; RING
Issue Date
201101
Publisher
POLYMER SOC KOREA
Citation
POLYMER-KOREA, v.35, no.1, pp.77 - 86
Abstract
Polymerization properties of six dinuclear constrained geometry catalysts (DCGC) were investigated. The different length bridges of three catalysts were para phenyl (Catalyst 1), para-xylyl (Catalyst 2), and para-diethylene phenyl (Catalyst 6). The other three DCGC have the same para-xylyl bridge with the different substituents at the phenyl ring of the bridge. The selected substituents were isopropyl (Catalyst 3), n-hexyl (Cataylst 4), and n-octyl (Catalyst 5). It was found that the longer catalyst not only exhibited a greater activity but also prepared a higher molecular weight copolymer. The catalyst 3 having a bulky isopropyl substituent revealed the lower activity but formed the highest molecular weight polymer comparing with the other alkyl substituted DCGCs. These results were able to be understood on the basis of the electronic and steric characteristics of the bridge. This study confirms that the control of the bridge structure of DCGC may contribute to control the microstructure of polymers.
URI
http://hdl.handle.net/YU.REPOSITORY/25789
ISSN
0379-153X
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