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- W1758771194 abstract "Block copolymerizations of 1-chloro-1-octyne (1-ClO) with several substituted acetylenes were examined by means of living polymerization. o-(Trifluoromethyl)phenylacetylene (o-CF3PA), o-(trimethylsilyl)phenylacetylene (o-Me3SiPA), 1-chloro-2-phenylacetylene (1-ClPA), p-butyl-o,o,m,m-tetrafluorophenylacetylene (p-BuF4PA), and tert-butylacetylene (t-BuA) were used as comonomers, and the MoOCl4-n-Bu4Sn-EtOH (mole ratio 1:1:1) catalyst, which is known to effect living polymerization of substituted acetylenes, was employed. When o-CF3PA and 1-CIPA were the comonomers in combination with 1-CIO, block copolymers were exclusively obtained in both orders of monomer addition. In the cases of o-Me3SiPA and p-BuF4PA as comonomers, the copolymerizations initiated from 1-CIO produced block copolymers selectively, whereas the homopolymers of o-Me3SiPA and p-BuF4PA also formed if the order of monomer addition was reversed. The pair of 1-CIO and t-BuA did not selectively yield block copolymers irrespective of the order of monomer addition. Thus, block copolymerization occurred between 1-CIO and monomers that show high “livingness” and close reactivities." @default.
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- W1758771194 date "1992-03-01" @default.
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- W1758771194 doi "https://doi.org/10.1002/macp.1992.021930322" @default.
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