A nonaqueous potentiometric titration study of the dissociation of t-butyl methacrylate-methacrylic acid copolymers. |
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| Authors: | Kiyoharu Nakatani Jun Yamashita Tomomi Sekine Minoru Toriumi Toshiro Itani |
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| Affiliation: | Department of Chemistry, University of Tsukuba, 1-1-1 Tennoudai, Tsukuba 305-8571, Japan. nakatani@chem.tsukuba.ac.jp |
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| Abstract: | The dissociation of t-butyl methacrylate-methacrylic acid copolymers in dimethyl sulfoxide was analyzed by a nonaqueous potentiometric titration technique. The negative logarithm of the dissociation constant of the monomer unit of a methacrylic acid (MAA) monotonously increased with the increasing degree of dissociation corresponding to the titrant/MAA amount ratio, and was highly influenced by the copolymerization ratio. The results are discussed in terms of the suppression of the dissociation of MAA by a neighboring charged methacrylate anion unit. |
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