ASSOCIATION OF ETHYLENE—VINYL ACETATE COPOLYMER IN DILUTE SOLUTIONS Ⅲ. CRITICAL ASSOCIATION CONCENTRATION

摘要

Association behavior of ethylene vinyl acetate （EVA） copolymer in foursolvents 1, 2-dichloroethane （DCE）, cyclohexane （CYH）, xylene （XYL） and chloroform（CF） has been investigated by dilute solution viscometry The critical association concen-tration （CA） was determined at which the incipient decrease in slope of the ηsp/C～ Ccurve in solutions at the dilute regime. Our results showed that whether the CA couldexist depends on solvent property. The values of CA in DCE increase with increasing, oftemperature and vinyl acetate （VA） content in EVA and decreasing of molecular weight ofEVA.