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Title: Characterization of 4-vinylpyridine-styrene copolymer by NMR spectroscopy
Authors: Hooda, Sunita
Brar, A S
Issue Date: May-2001
Publisher: NISCAIR-CSIR, India
Abstract: 4-Vinylpyridine-styrene (V/S) copolymers of different compositions have been prepared by free radical bulk polymerization. The copolymer composition has been calculated from 1H NMR spectra. The co-monomer reactivity ratios of V/S copolymer have been calculated from Kelen-Tudos (KT) and non-linear error in variables methods (EVM). The reactivity ratios obtained from KT and EVM are rV = 0.85, rS = 0.67 and rV =0.80± 0.20, rS = 0.66 ± 0.05 respectively. The copolymerization parameters such as conditional probabilities, number - average sequence lengths and block character in the copolymers have been calculated from 13C{1H}-NMR spectra. The observed triads concentration as determined from 13C{1H}- NMR spectra are in good agreement with those calculated from statistical model using terminal model reactivity ratios. The complete spectral assignment of these copolymers has been done with the help of Distortionless Enhancement by Polarization Transfer (DEPT) and two dimensional heteronuclear single quantum coherence (HSQC) spectra. The various type of 1H-1H couplings in copolymer are assigned with the help of 2D-Total correlated spectroscopy (TOCSY).
Page(s): 483-490
ISSN: 0975-0975(Online); 0376-4710(Print)
Appears in Collections:IJC-A Vol.40A(05) [May 2001]

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