Behavior of Nonalternating Maleic Acid Copolymers in Aqueous Solution

• Published in: Langmuir Vol. 15; no. 12; pp. 4150 - 4156
• Main Authors: Chitanu, G. C, Rinaudo, M, Desbrières, J, Milas, M, Carpov, A
• Format: Journal Article Conference Proceeding
• Language: English
• Published: Washington, DC American Chemical Society 08-06-1999
• Subjects: Applied sciences; Chemical Sciences; Exact sciences and technology; Ionization properties; Organic polymers; Physicochemistry of polymers; Polymers; Properties and characterization; Ion transport; Experimental study; Methyl methacrylate copolymer; Polyelectrolyte; Calcium ion; Transport coefficient; Preparation; Counter ion; Maleic acid copolymer; Aqueous solution; pK; Radical copolymerization; Acid base titration; Lithium ion; Conformational transition
• ISSN: 0743-7463; 1520-5827
• DOI: 10.1021/la981509z

A nonalternating 1:3 maleic acid−methyl methacrylate copolymer was synthesized and characterized, and its polyelectrolyte behavior was studied by potentiometric and conductometric titrations. Two intrinsic dissociation constants were found equal to 3.5 and 7.6, and only a slight influence of the nature of the counterions and of the presence of added salt (0.1 M) was observed. The transport coefficients, determined from conductometry, for mono- and divalent cations were in relatively good agreement with the values calculated from Manning theory, especially at low polymer concentrations. A conformational change around αN ∼ 0.25 was confirmed by means of viscometric and fluorescence measurements.