A high resolution NMR investigation into the microstructure of HEMA and EEMA copolymers

Hill D.J.T., O'Donnell J.H., Pomery P.J. and Whittaker M.R. (1995) A high resolution NMR investigation into the microstructure of HEMA and EEMA copolymers. Polymer Gels and Networks, 3 1: 85-97. doi:10.1016/0966-7822(94)00024-2


Author Hill D.J.T.
O'Donnell J.H.
Pomery P.J.
Whittaker M.R.
Title A high resolution NMR investigation into the microstructure of HEMA and EEMA copolymers
Journal name Polymer Gels and Networks   Check publisher's open access policy
ISSN 0966-7822
Publication date 1995
Sub-type Article (original research)
DOI 10.1016/0966-7822(94)00024-2
Volume 3
Issue 1
Start page 85
End page 97
Total pages 13
Subject 1500 Chemical Engineering
2507 Polymers and Plastics
3003 Pharmaceutical Science
Abstract 13C NMR spectra (125 MHz) of 2-hydroxyethyl methacrylate (HEMA) and 2-ethoxyethyl methacrylate (EEMA) copolymers, prepared by bulk free radical copolymerisation, were analysed in terms of the comonomer composition and relative stereochemical configuration. The monomer reactivity ratios were evaluated using a nonlinear least squares analysis, considering both the terminal and penultimate models. Although both models adequately describe the experimentally determined copolymer compositions at a 99.5% confidence level or better, the statistical F-test showed that there is no significant improvement in the fit of the data for the penultimate model over that for the terminal model. The best estimates for the terminal model reactivity ratios are rH = 1.202 and rE = 0.724. The copolymers were found to be mainly syndiotactic. Using the Bernoullian distribution of stereoregularity, the coisotacticity parameters ΘHH = 0.25, ΘEE = 0.23 and Θ* = ΘHE = ΘEH = 0.21 were determined. Predictions for stereochemical and comonomer distributions in a copolymer prepared to high conversions are presented.
Q-Index Code C1
Q-Index Status Provisional Code
Institutional Status Unknown

Document type: Journal Article
Sub-type: Article (original research)
Collection: Scopus Import
 
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