Tacticity control by conformational isomerization in free radical polymerization of acrylate |
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Authors: | Hitoshi Tanaka Miki Niwa |
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Affiliation: | Institute of Technology and Science, University of Tokushima, Minamijosanjima-cho, Tokushima 770-8506, Japan |
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Abstract: | Contribution of conformational isomerization to polymer tacticity has been studied in free radical polymerization of (−)-menthyl 2-acetamidoacrylate with azo initiators. It has been demonstrated that the chain end of the growing polymer radical, which is generated from the s-trans and s-cis conformers of monomer, produces stereoselectively new R and S configurational quaternary carbons, respectively, for the attack of monomer. In addition, polymerization reactivity of both conformers is indistinguishable under the present conditions, and the polymerization is considered to proceed through a chain-end controlled mechanism, which excludes a penultimate unit effect on tacticity in the polymerization. The results obtained would give a clue to understand an origin of tacticity in conventional free radical polymerization of acrylates. |
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Keywords: | Radical polymerization Tacticity Acrylate |
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