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Copolymerization of ethylene with methyl methacrylate by ziegler‐natta‐type catalysts based on nickel salicylaldiminate/methylalumoxane systems
Author(s) -
Carlini Carlo,
Martinelli Marco,
Raspolli Galletti Anna Maria,
Sbrana Glauco
Publication year - 2002
Publication title -
macromolecular chemistry and physics
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.57
H-Index - 112
eISSN - 1521-3935
pISSN - 1022-1352
DOI - 10.1002/1521-3935(200207)203:10/11<1606::aid-macp1606>3.0.co;2-p
Subject(s) - nickel , copolymer , catalysis , ethylene , polymer chemistry , methyl methacrylate , chemistry , materials science , organic chemistry , polymer
Bis(salicylaldiminate)nickel(II) complexes, such as bis[ N (2,6‐diisopropylphenyl) salicylaldiminate]nickel(II) and bis( N ‐isopropylsalicylaldiminate)nickel(II), were activated by methylalumoxane (MAO) to give catalytic systems able to copolymerize ethylene (E) with methyl methacrylate (MMA), thus producing low molecular weight copolymers with a rather high content of MMA co‐units (50–80 mol‐%). On the contrary, when catalytic systems, obtained by oxidative addition of salicylaldimine ligands such as 5‐nitro‐ N‐ (2,6‐diisopropylphenyl)salicylaldimine (NPS) and 3,5‐dinitro‐ N ‐(2,6‐diisopropylphenyl)salicylaldimine (DNPS) to bis(cyclooctadienyl)nickel(0) [Ni(cod) 2 ], were activated with MAO, high viscometric average molecular weight ( M v 10–30 × 10 4 Da) E/MMA copolymers with a low content of MMA co‐units (3–6 mol‐%) were formed, thus allowing to obtain directly by synthesis functionalized highly linear poly(ethylene)s ( T m up to 130 °C) to be potentially applied as new materials with improved surface properties.