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

摘要

AbstractThe specific retention volumes of nine hydrocarbons and 12 alcohols were measured at several temperatures within the range 120–150°C in columns whose stationary phases were poly(vinyl 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 VAc). No chromatographic retention for hydrocarbons was detected in columns loaded with poly(vinyl alcohol) (PVA) or a copolymer with 11.9 mol VAc. The retention trends are discussed and the polymers solubility parameters (δ2) were computed from the measured Flory–Hugginsχparameters. The copolymers δ2values increase almost linearly with decreasing mol VAc; PVAc, however, has a distinct behavior. The limitations of the approach in the prediction ofχparameters are d