Poly(vinyl ester) star polymers via xanthate-mediated living radical polymerization: From poly(vinyl alcohol) to glycopolymer stars

Bernard, J., Favier, A., Zhang, L., Nilasaroya, A., Davis, T. P., Barner-Kowollik, C., & Stenzel, M. H. (2005) Poly(vinyl ester) star polymers via xanthate-mediated living radical polymerization: From poly(vinyl alcohol) to glycopolymer stars. Macromolecules, 38(13).

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PolyCvinyl ester) stars have been synthesized via different macromolecular design via interchange of xanthate (MADIX)/reversible addition-fragmentation chain transfer (RAFT) polymerization methodologies. Two approaches were investigated. The first method involved attaching the xanthate functionality to the core via a nonfragmenting covalent bond (Z-group approach). The second approach involved attaching the xanthate functionality to the core via a fragmenting covalent bond (R-group approach). The R-group approach yielded well-defined poly(vinyl acetate), poly(vinyl pivalate), and poly-(vinyl neodecanoate) stars with narrow polydispersities (PDI ≤ 1.4). In contrast, the molecular weight distributions of poly(vinyl acetate) stars prepared using the Z-approach tended to broaden at moderate to high conversions. We attribute this broadening to steric congestion around the xanthate functionality, restricting the access of monomer to the C=S bonds. The R-group approach was also found to be superior for preparing precursor stars suitable for hydrolysis to poly(vinyl alcohol). Hydrolysis of stars generated by the Z-group approach resulted in destruction of the architecture, as the process also cleaved the xanthate linkage at the nexus of the arms and core. Preliminary experiments on using the R-group approach to mediate the star-polymerization of vinyl-functional glycomonomers demonstrated the possibility of generating complex glycopolymer architectures. However, some significant problems were observed, and this synthetic approach requires further optimization. © 2005 American Chemical Society.

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ID Code: 99100
Item Type: Journal Article
Refereed: Yes
Additional Information: Cited By :133
Export Date: 5 September 2016
Correspondence Address: Stenzel, M.H.; Centre for Advanced Macromolecular Design (CAMD), School of Chemical Engineering and Industrial Chemistry, University of New South Wales, Sydney, NSW 2052, Australia; email: camd@unsw.edu.au
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Keywords: Addition reactions, Chemical bonds, Free radical polymerization, Hydrolysis, Molecular weight, Synthesis (chemical), Viscosity measurement, Atom transfer radical polymerization (ATRP), Glycopolymer stars, Polydispersity, Vinyl esters, Polyvinyl acetates
DOI: 10.1021/ma050050u
ISSN: 00249297
Divisions: Current > Schools > School of Chemistry, Physics & Mechanical Engineering
Current > Institutes > Institute for Future Environments
Current > QUT Faculties and Divisions > Science & Engineering Faculty
Deposited On: 22 Sep 2016 04:50
Last Modified: 22 Sep 2016 04:50

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