Propagation rate coefficient for sulfobetaine monomers by PLP-SEC
Author | Lacík, Igor |
Author | Sobolčiak, Patrik |
Author | Stach, Marek |
Author | Chorvát, Dušan |
Author | Kasák, Peter |
Available date | 2021-04-08T09:00:44Z |
Publication Date | 2016 |
Publication Name | Polymer |
Resource | Scopus |
ISSN | 323861 |
Abstract | Zwitterionic polymers have been extensively used in the biomedical field, however, the knowledge about the kinetics and mechanism of radical polymerization of their monomers is limited. This work introduces the first propagation rate coefficients, kp's, determined by pulsed-laser polymerization in conjunction with size-exclusion chromatography for the methacrylate-type sulfobetaine monomers N-(methacryloylaminopropyl)-N,N-dimethyl-N-(3-sulfopropyl) ammonium betaine (SBAm) and N-(methacryloyloxyethyl)-N,N-dimethyl-N-(3-sulfopropyl) betaine (SBE). The kp values are determined in aqueous solutions for monomer concentrations between 5 and 50 wt % and temperatures between 15 and 80 °C. The propagation rate for SBE is by about a factor of two higher than that for SBAm. The solvent effect manifested by the kp dependence on monomer concentration is stronger for SBAm than for SBE. The kp decreases upon increasing the monomer concentration up to 20 wt % followed by independence of kp on further increased monomer concentration. The anti-polyelectrolyte effect and the significance of hydrogen bonding interactions on kp values are illustrated by polymerizations in the presence of NaCl and organic co-solvents, respectively. |
Sponsor | This work was supported by VEGA Grant Agency under the contract No. 2/0198/14, and by the Slovak Research and Development Agency under the contract No. APVV-14-0858. Mrs. Eva Hipka from the Polymer Institute of the Slovak Academy of Sciences is thanked for the SEC experiments. Dr. Anatoly Nikitin from the ILIT RAS, Russia, is acknowledged for the discussion on the possible influence of low termination rate limit on propagation rate coefficients. Prof. Dr. Michael Buback from the Georg-August University in Göttingen, Germany, is thanked for providing valuable comments to the manuscript. |
Language | en |
Publisher | Elsevier Ltd |
Subject | PLP-SEC Propagation rate coefficient Sulfobetaine |
Type | Article |
Pagination | 38-49 |
Volume Number | 87 |
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Center for Advanced Materials Research [1349 items ]