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Tacticity control by conformational isomerization in free radical polymerization of acrylate
- Source :
-
Polymer . Aug2008, Vol. 49 Issue 17, p3693-3701. 9p. - Publication Year :
- 2008
-
Abstract
- 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. [Copyright &y& Elsevier]
- Subjects :
- *ISOMERIZATION
*POLYMERS
*MONOMERS
*POLYMERIZATION
*ACRYLATES
Subjects
Details
- Language :
- English
- ISSN :
- 00323861
- Volume :
- 49
- Issue :
- 17
- Database :
- Academic Search Index
- Journal :
- Polymer
- Publication Type :
- Academic Journal
- Accession number :
- 33631539
- Full Text :
- https://doi.org/10.1016/j.polymer.2008.06.042