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Living polymerization of several substituted acetylenes with WOCl 4 –Bu 4 Sn– tert ‐BuOH (1 : 1 : 1) as a catalyst
Author(s) -
Hayano Shigetaka,
Masuda Toshio
Publication year - 2000
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/(sici)1521-3935(20000201)201:2<233::aid-macp233>3.0.co;2-u
Subject(s) - polymerization , polymer chemistry , acetylene , living polymerization , trimethylsilyl , polymer , molar mass distribution , copolymer , catalysis , chemistry , solution polymerization , materials science , radical polymerization , organic chemistry
Living polymerization of several substituted acetylenes was studied with a W‐based ternary catalyst, WOCl 4 –Bu 4 Sn– tert ‐BuOH (1 : 1 : 1). [ o ‐(Trimethylsilyl)phenyl]acetylene forms a polymer with a narrow molecular weight distribution (MWD) ( M w / M n 1.08). The living nature of this polymerization system was proved by both multistage polymerization and the conversion dependence of the polymer molecular weight. Linear internal alkynes (e. g., 5‐dodecyne) also yield polymers with a narrow MWD ( M w / M n ∼ 1.10), which were proven to be obtained by living polymerization by examination of the conversion dependence of the polymer molecular weight. However, neither 1‐chloro‐1‐alkynes nor tert ‐butylacetylene, polymerize in a living fashion with this catalyst. A block copolymer was selectively prepared by sequential polymerization of [ o ‐(trimethylsilyl)phenyl]acetylene and [ o ‐(trifluoromethyl)phenyl]acetylene.