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Ethylene/α‐olefin copolymerization by nonbridged (cyclopentadienyl)(aryloxy)titanium(IV) dichloride/Al i Bu 3 /Ph 3 CB(C 6 F 5 ) 4 catalyst systems
Author(s) -
Li Hongchun,
Niu Yongsheng
Publication year - 2011
Publication title -
journal of applied polymer science
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.575
H-Index - 166
eISSN - 1097-4628
pISSN - 0021-8995
DOI - 10.1002/app.33962
Subject(s) - comonomer , cyclopentadienyl complex , ethylene , metallocene , copolymer , catalysis , polymer chemistry , chemistry , 1 hexene , hexene , reactivity (psychology) , medicinal chemistry , polymerization , organic chemistry , medicine , polymer , alternative medicine , pathology
A series of nonbridged (cyclopentadienyl) (aryloxy)titanium(IV) complexes of the type, (η 5 ‐Cp′)(OAr)TiCl 2 [OAr = O‐2,4,6‐ t Bu 3 C 6 H 2 and Cp′ = Me 5 C 5 ( 1 ), Me 4 PhC 5 ( 2 ), and 1,2‐Ph 2 ‐4‐MeC 5 H 2 ( 3 )], were prepared and used for the copolymerization of ethylene with α‐olefins (e.g., 1‐hexene, 1‐octene, and 1‐octadecene) in presence of Al i Bu 3 and Ph 3 CB(C 6 F 5 ) 4 (TIBA/B). The effect of the catalyst structure, comonomer, and reaction conditions on the catalytic activity, comonomer incorporation, and molecular weight of the produced copolymers was examined. The substituents on the cyclopentadienyl group of the ligand in 1 – 3 play an important role in the catalytic activity and comonomer incorporation. The 1 /TIBA/B catalyst system exhibits the highest catalytic activity, while the 3 /TIBA/B catalyst system yields copolymers with the highest comonomer incorporation under the same conditions. The reactivity ratio product values are smaller than those by ordinary metallocene type, which indicates that the copolymerization of ethylene with 1‐hexene, 1‐octene, and 1‐octadecene by the 1–3/ TIBA/B catalyst systems does not proceed in a random manner. © 2011 Wiley Periodicals, Inc. J Appl Polym Sci, 2011