Journal
JOURNAL OF POLYMER SCIENCE PART A-POLYMER CHEMISTRY
Volume 40, Issue 12, Pages 1945-1951Publisher
WILEY
DOI: 10.1002/pola.10281
Keywords
methyl 2-acetamidoacrylate; methyl methacrylate; copolymers; lower critical solution temperature; salting-out; effect of copolymer composition; amphiphiles; stimuli-sensitive polymers; water-soluble polymers
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Copolymerizations of methyl 2-acetamidoacrylate (MAA) with methyl methacrylate (MMA) were carried out at 60 degreesC in chloroform. Copolymers containing MAA units in the range of 83-90 mol % exhibited a lower critical solution temperature (LCST), although homopolymers of MAA and MMA did not. The LCST of polymer solutions decreased with (1) an increase in the concentration of the copolymer, (2) a decrease in the MAA content in the copolymer, and (3) an increase in the concentration of salts added. The effectiveness of anionic species for reducing the LCST is NO3 < Cl- SO42- < SO32-. Divalent anion is more effective for lowering the LCST than monovalent anion. However, there is no difference between cationic species in the salting-out effect. Sodium carbonate and sodium phosphate had a salting-in effect. Salting-out coefficients were evaluated from the relationship between the logarithm of solubility of the copolymers and the salt concentration. Salting-out coefficients of the copolymer depended not on the composition of the copolymers but on the salt added. (C) 2002 Wiley Periodicals, Inc.
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