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Study of polymer–solvent interactions by gas chromatography. Copolymers of vinyl acetate and vinyl alcohol with hydrocarbons and alcohols

✍ Scribed by Reynaldo César Castells; Germán Delfor Mazza

Publisher
John Wiley and Sons
Year
1986
Tongue
English
Weight
821 KB
Volume
32
Category
Article
ISSN
0021-8995

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✦ Synopsis

Synopsis

T h e specific retention volumes of nine hydrocarbons and 12 alcohols were measured at several temperatures within the range 120-150O C in columns whose stationary phases were poly(viny1 acetate) (PVAc) and four copolymers of vinyl acetate and vinyl alcohol with 94.8, 74.4, 60.9, and 43.4 mol % of vinyl acetate units (mol 4& VAc). No chromatographic retention for hydrocarbons was detected in columns loaded with poly(viny1 alcohol) (PVA) or a copolymer with 11.9 mol % VAc. The retention trends are discussed and the polymers solubility parameters (8,) were computed from the measured Flory-Huggins x parameters. The copolymers 8, values increase almost linearly with decreasing mol % VAc; PVAc, however, has a distinct behavior. The limitations of the approach in the prediction of x parameters are discussed.

where v 1 is the solvent molar volume, 6, and 6, are the solubility parameters of solvent and polymer, respectively, and x s is an entropy correction term,

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