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Living polymerization of substituted acetylenes by a novel ternary catalyst, MoOCl 4 Et 2 ZnEtOH
Author(s) -
Hayano Shigetaka,
Masuda Toshio
Publication year - 1997
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/macp.1997.021981005
Subject(s) - polymerization , chemistry , polymer chemistry , living polymerization , phenylacetylene , catalysis , anisole , ionic polymerization , polymer , solution polymerization , bulk polymerization , organic chemistry , radical polymerization
A novel molybdenum oxytetrachloride (MoOCl 4 )‐based ternary catalyst, molybdenum oxytetrachloride/diethylzinc/ethanol (MoOCl 4 Et 2 ZnEtOH), induces the living polymerization of o ‐(trifluoromethyl)phenylacetylene. A catalyst composition of MoOCl 4 :Et 2 Zn: EtOH (mole ratio = 1:1:3) and anisole as polymerization solvent are favorable. The ratio of weight‐ to number‐average molecular weights M w / M n of the polymer was as small as 1,03, and the initiator efficiency was 8%. Living polymerization was verified by multistage polymerization. The polymerization proceeded in a living fashion in the temperature range from 0 to 30°C. The catalyst yielded polymers with small M w / M n values also from other phenylacetylenes with bulky ortho substituents and 1‐chloro‐1‐octyne.