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http://nopr.niscpr.res.in/handle/123456789/18248| Title: | Reactivity ratio determination and complete spectral assignment of 4-vinyl pyridine-ethyl acrylate copolymer by NMR spectroscopy |
| Authors: | Hooda, Sunita |
| Issue Date: | Apr-2002 |
| Publisher: | NISCAIR-CSIR, India |
| Abstract: | 4-Vinylpyridine-ethyl acrylate (V/E) copolymers of different compositions have been prepared by free radical bulk polymerization. The copolymer composition has been calculated from 1H-NMR spectra. The comonomer reactivity ratios of VIE copolymer have been calculated from linear Kelen-Tudos (KT) and non-linear error-in-variables method (EVM). The reactivity ratios obtained from KT and EVM are rv = 0.34 ± 0.07, rE = 0.23 ± 0.07 and rv =0.36 ± 0.08, rE = 0.25 ± 0.04 respectively. The theoretical triads concentration has been determined from statistical model using terminal model reactivity ratios. The complete spectral assignment of these copolymers has been done with the help of distortion less enhancement by polarization transfer (DEPT) and two dimensional heteronuclear single quantum coherence (HSQC) spectra. The various type of 1H-1H couplings in copolymer have been assigned with the help of 2D- total correlated spectroscopy (TOCSY). |
| Page(s): | 723-729 |
| ISSN: | 0975-0975(Online); 0376-4710(Print) |
| Appears in Collections: | IJC-A Vol.41A(04) [April 2002] |
Files in This Item:
| File | Description | Size | Format | |
|---|---|---|---|---|
| IJCA 41A(4) 723-729.pdf | 1.2 MB | Adobe PDF | View/Open |
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