Premium
Novel Ni and Pd(benzocyclohexan‐ketonaphthylimino) 2 complexes for copolymerization of norbornene with octene
Author(s) -
Liu Yueman,
Ouyang Meng,
He Xiaohui,
Chen Yiwang,
Wang Kaiti
Publication year - 2012
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.38171
Subject(s) - comonomer , norbornene , copolymer , 1 octene , monomer , polymerization , catalysis , polymer chemistry , reactivity (psychology) , polymer , palladium , transition metal , octene , denticity , ligand (biochemistry) , materials science , chemistry , crystallography , crystal structure , organic chemistry , medicine , biochemistry , alternative medicine , receptor , pathology
Two novel late transition metals complexes with bidentate OˆN chelate ligand, Mt(benzocyclohexan‐ketonaphthylimino) 2 {Mt(bchkni) 2 : bchkni C 10 H 8 (O)C[N(naphthyl)CH 3 ]; Mt Ni, Pd}, were synthesized. In the presence of B(C 6 F 5 ) 3 , both complexes exhibited high activity toward the homo‐polymerization of norbornene (NB) (as high as 2.7 × 10 5 g polymer /mol Ni ·h for Ni(bchkni) 2 /B(C 6 F 5 ) 3 and 2.3 × 10 5 g polymer /mol Pd ·h for Pd(bchkni) 2 /B(C 6 F 5 ) 3 , respectively). Additionally, both catalytic systems showed high activity toward the copolymerization of NB with 1‐octene under various polymerization conditions and produced the addition‐type copolymer with relatively high molecular weights (0.1–1.4 × 10 5 g/mol) as well as narrow molecular weight distribution. The 1‐octene content in the copolymers can be controlled up to 8.9–14.0% for Ni(bchkni) 2 /B(C 6 F 5 ) 3 and 8.8–14.6% for Pd(bchkni) 2 /B(C 6 F 5 ) 3 catalytic system by varying comonomer feed ratios from 10 to 70 mol %. The reactivity ratios of two monomers were determined to be r 1‐octene = 0.052, r NB = 8.45 for Ni(bchkni)/B(C 6 F 5 ) 3 system, and r 1‐octene = 0.025, r NB = 7.17 for Pd(bchkni)/B(C 6 F 5 ) 3 system by the Kelen‐TÜdÕs method. The achieved NB/1‐octene copolymers were confirmed to be noncrystalline and exhibited good thermal stability ( T d > 400°C, T g = 244.1–272.2°C) and showed good solubility in common organic solvents. © 2012 Wiley Periodicals, Inc. J. Appl. Polym. Sci., 2013