Stability conditions for aqueous emulsions of acrylic–methacrylic copolyme
The stability has been studied of aqueous emulsions of xylene solutions of acrylic–methacrylic copolymers, viz., methyl methacrylate/butyl acrylate/methacrylic acid (MMA/BA/MAA) terpolymer and 72-butyl methacrylate/ methacryloamide (MBA/AMAA) copolymer, stabilized with nonionic surfactants. The surfactants were oleic acid, triglyceride, saturated and unsaturated fatty alcohols and lauric alcohol, all oxyethylenated to varying degrees. Those most active in water (surfactants with the lowest value of Ссмс> i-e', critical micelle formation concentration) did not necessarily produce the most stable emulsions. Emulsions of copolymers with amino groups (MBA/AMAA) are much more difficult to stabilize than those of copolymers with carboxylic groups (MMA/BA/MAA). For MMAS/BA/MAA emulsions, oxyethylenated triglyceride or oxyethylenated saturated fatty alcohol was the best emulsifier and stabilizer; for MBA/AMAA emulsion – oxyethylenated oleic acid or the above mentioned oxyethylenated saturated fatty alcohol. Results were interpreted in terms of the Hildebrand solubility parameters and the hydrophilic-lipophilic balance (HLB) in the copolymer–surfactant systems.
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