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Received May 23, 2007
Accepted July 14, 2007
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Influence of type and positioning of N-aryl substituents on vinyl polymerization of norbornene by Ni(II) α-diimine complexes
Department of Polymer Science and Engineering, Pusan National University, Busan 609-735, Korea
ilkim@pusan.ac.kr
Korean Journal of Chemical Engineering, May 2008, 25(3), 423-425(3), 10.1007/s11814-008-0071-9
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Abstract
Effects of structural variations of the diimine ligand on catalyst activities for vinyl polymerization of norbornene (NB) have been investigated by a series of Ni(II) α-diimine catalysts of the general formula: [{ArN=C(Ac)-C(Ac)=NAr}]NiBr2 (Ac=acenaphthyl) (Cat(H), Ar=C6H5; Cat(2,6-Me), Ar=2,6-C6H3Me2; Cat(2,6-Et), Ar=2,6-C6H3Et2; Cat(2,6-iPr), Ar=2,6-C6H3 i-Pr2; Cat(2,3-Me), Ar=2,3-C6H3Me2; Cat(2,4-Me), Ar=2,4-C6H3Me2; Cat(2,5-Me), Ar=2,5-C6H3Me2; Cat(3,5-Me), Ar=3,5-C6H3Me2; Cat(2,4,6-Me), Ar=2,4,6-C6H2Me3). In situ reactions with methylaluminoxane generated the active catalysts, and they showed good activity towards NB polymerizations. As indicated by relatively higher activities of Cat(H) and Cat(3,5-Me), it can be generalized that catalysts having 2,6-substituents are less active due to steric interaction between monomer and substituents. In addition, electron donating methyl groups at 2-, 4- or 6-position on the N-aryl have a con effect and that at 3,5-position has a pro effect.
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References
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Patil AO, Zushma S, Stibrany RT, Rucker SP, Wheeler LM, J. Polym. Sci. A: Polym. Chem., 41(13), 2095 (2003)
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Myagmarsuren G, Jeong OY, Ihm SK, Appl. Catal. A: Gen., 255(2), 203 (2003)
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Resconi L, Camurati I, Sudmeijer O, Top. Catal., 7, 145 (1999)
Haselwander FA, Heitz W, Krugel SA, Wendorff JH, Macromol. Chem. Phys., 197, 3435 (1996)
