Relation of Structural Features of Dinuclear Constrained Geometry Catalysts with Copolymerization Properties of Ethylene and 1-Hexene

Title
Relation of Structural Features of Dinuclear Constrained Geometry Catalysts with Copolymerization Properties of Ethylene and 1-Hexene
Author(s)
노석균까오환투이미웽티레녕웽티레탄
Keywords
HALF-TITANOCENE COMPLEXES; RADICAL POLYMERIZATION; STYRENE POLYMERIZATION; METALLOCENE; MECHANISM; RING
Issue Date
201111
Publisher
POLYMER SOC KOREA
Citation
POLYMER-KOREA, v.35, no.6, pp.505 - 512
Abstract
Effects of structural features of 4 dinuclear constrained geometry catalysts having para-xylene derivative bridge (DCGC) on copolymerization of ethylene and 1-hexene were investigated. The bridges of three catalysts have para-xylene backbone with a different substituent at benzene ring. The substituents were hydrogen (Catalyst 1). isopropyl (Catalyst 2), n-hexyl (Catalyst 3) and 1 octyl (Catalyst 4). It was found that Catalyst 1 having hydrogen as a substituent exhibited the greatest activity among the four dinuclear CGCs. On the other hand, Catalyst 2 containing isopropyl as a substituent showed the smallest activity. Very interestingly, Catalyst 2 was able to produce about 6 times higher molecular weight polymer than Catalyst 3 and 4. Catalyst 3 and 4 having a long alkyl chain substituent revealed the biggest comonomer response to generate polyethylene copolymer containing more than 40% 1-hexene contents. These results suggest that the control of the substituent of para-xylene bridge of dinuclear CGC can provide a proper method to adjust the microstructure of polyethylene copolymers.
URI
http://hdl.handle.net/YU.REPOSITORY/24297
ISSN
0379-153X
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총장실 > 총장실 > Articles
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