Jm. Teijon et al., VISCOSITY BEHAVIOR OF POLY(ETHYL METHACRYLATE) IN THE ETHYL ACETATE TERT-BUTANOL BINARY MIXTURE - TOTAL AND PREFERENTIAL ADSORPTION/, Polymer international, 41(1), 1996, pp. 59-65
The behaviour of poly(ethyl methacrylate) (PEMA) in the ethyl acetate
(1)/tert-butanol (2) binary mixture is studied by laser light scatteri
ng, differential refractometry and viscometry. Ethyl acetate is a solv
ent for the polymer and tert-butanol is a precipitant. Preferential ad
sorption of tert-butanol up to 15% alcohol in the binary mixture is ob
served, ethyl acetate being preferentially adsorbed in the macromolecu
lar coil at higher percentage of alcohol in the solvent mixture. Total
adsorption of PEMA is independent of the amount of tert-butanol in th
e solvent. Various theoretical expressions for the preferential and to
tal adsorption coefficients are used; their agreement or disagreement
with the experimental results is explained on the basis of polymer-sol
vent interactions.