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Development of a nonaqueous solvent system for poly(vinyl alcohol) and its characterization

โœ Scribed by B. Tosh; C. N. Saikia; N. N. Dass

Publisher
John Wiley and Sons
Year
1999
Tongue
English
Weight
157 KB
Volume
74
Category
Article
ISSN
0021-8995

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โœฆ Synopsis

Solubility of poly(vinyl alcohol) (PVA) in water prevents the preparation of various derivatives through homogeneous techniques as most of the derivatives thus formed are insoluble in aqueous medium. There are a number of solvents that can swell PVA under hot conditions but cannot dissolve PVA. In the present study, N,N-dimethyl acetamide (DMAc) has been identified as solvent in which PVA can be dissolved in the presence of an equimolar amount of lithium chloride (LiCl). 1 H nuclear magnetic resonance ( 1 H-NMR), 13 C-NMR, infrared (IR), and X-ray diffraction (XRD) studies have been carried out to characterize the regenerated poly(vinyl alcohol) (RPVA). DMAc-LiCl is found to be a true solvent system for dissolution of PVA. An attempt has also been made to prepare poly(vinyl acetate) from this solution of PVA by a homogeneous technique.

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