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Development of a nonaqueous solvent system for poly(vinyl alcohol) and its characterization
Author(s) -
Tosh B.,
Saikia C. N.,
Dass N. N.
Publication year - 1999
Publication title -
journal of applied polymer science
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.575
H-Index - 166
eISSN - 1097-4628
pISSN - 0021-8995
DOI - 10.1002/(sici)1097-4628(19991017)74:3<663::aid-app20>3.0.co;2-b
Subject(s) - vinyl alcohol , solvent , acetamide , solubility , dissolution , aqueous solution , polymer chemistry , vinyl acetate , lithium chloride , vinyl chloride , materials science , chemistry , nuclear chemistry , organic chemistry , copolymer , polymer
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. © 1999 John Wiley & Sons, Inc. J Appl Polym Sci 74: 663–669, 1999