Neutralization degree effect on poly(4-vinylpyridine) behavior in dilute water–methanol solutions: UV–visible and 1H NMR spectroscopy characterizations

Neutralization degree effect on poly(4-vinylpyridine) behavior in dilute water–methanol... Poly(4-vinylpyridine) (P4VP) (M v = 16 × 104 g/mol) was synthesized by radical polymerization. The molecular weight was determined using viscosity and light scattering techniques. The objective of this work is to study the interaction of P4VP (2.88 × 10−3 M) with proton H+ at 25 °C. The neutralization degrees vary between 0 and 1. This investigation was followed using UV–visible spectrophotometer and 1H NMR spectroscopy characterizations. An isobestic point was observed at α = 0.2 in 50/50 v/v water–methanol mixture. An equilibrium between the protonated and the non-protonated forms of P4VP was pronounced at α = 0.6. Constant 1H NMR chemical shifts are interpreted by stability of the structural copolymer conformation. For higher neutralization degree values, no significant changes of the structure and the conformation were observed. It was concluded that equilibrium exists between N and N+ in the P4VP/HCl system in 50 % water–methanol solution. http://www.deepdyve.com/assets/images/DeepDyve-Logo-lg.png Research on Chemical Intermediates Springer Journals

Neutralization degree effect on poly(4-vinylpyridine) behavior in dilute water–methanol solutions: UV–visible and 1H NMR spectroscopy characterizations

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Publisher
Springer Journals
Copyright
Copyright © 2014 by Springer Science+Business Media Dordrecht
Subject
Chemistry; Catalysis; Physical Chemistry; Inorganic Chemistry
ISSN
0922-6168
eISSN
1568-5675
D.O.I.
10.1007/s11164-014-1732-4
Publisher site
See Article on Publisher Site

Abstract

Poly(4-vinylpyridine) (P4VP) (M v = 16 × 104 g/mol) was synthesized by radical polymerization. The molecular weight was determined using viscosity and light scattering techniques. The objective of this work is to study the interaction of P4VP (2.88 × 10−3 M) with proton H+ at 25 °C. The neutralization degrees vary between 0 and 1. This investigation was followed using UV–visible spectrophotometer and 1H NMR spectroscopy characterizations. An isobestic point was observed at α = 0.2 in 50/50 v/v water–methanol mixture. An equilibrium between the protonated and the non-protonated forms of P4VP was pronounced at α = 0.6. Constant 1H NMR chemical shifts are interpreted by stability of the structural copolymer conformation. For higher neutralization degree values, no significant changes of the structure and the conformation were observed. It was concluded that equilibrium exists between N and N+ in the P4VP/HCl system in 50 % water–methanol solution.

Journal

Research on Chemical IntermediatesSpringer Journals

Published: Jun 26, 2014

References

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