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Molecular structure and dynamics of poly(methacrylic acid) and poly(acrylic acid) complexes with dodecyl-substituted poly(ethylene glycol)

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Abstract

The molecular dynamics and the structure of molecular complexes formed by micelles of dodecyl-substituted poly(ethylene glycol) with poly(methacrylic acid) and poly(acrylic acid) in aqueous solutions were studied by viscosimetry, pH measurement, and electron spin resonance spin-probe techniques. At low surfactant concentrations, the conformation of the complex is a compact globule. The local mobility of surfactant molecules in such a complex is much slower than that in the “free” micelle. At high surfactant concentration, the nonionic micelles and polyacids form hydrophilic associates. The associates have the conformation of extended coils. In an associate, a major part of the micellar poly(ethylene glycol) groups is free. The local mobility of the micellar phase depends on the number of micelles involved in an associate. The mobility of surfactant molecules is slower in the complexes of poly(methacrylic acid) than in the complexes of poly(acrylic acid).

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Acknowledgements

The authors thank L.L. Krinitskaya and A.B. Shapiro for the gift of spin probes, S. Shenkov for the gift of the DD-PEG, and V.F. Tarasov for helpful discussion. We are grateful to the Russian Foundation of Fundamental Research (grant 00-15-97404) and to the Bulgarian National Foundation “Scientific Researches” for financial support.

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Authors and Affiliations

  1. N.N. Semenov Institute of Chemical Physics RAS, ul. Kosygina 4, 119991, Moscow , Russia

    Alexander M. Wasserman, Larisa L. Yasina & Israil I. Aliev

  2. Institute of Polymers, Bulgarian Academy of Sciences, 1113 , Sofia, Bulgaria

    Veneta Doseva & Vladimir Y. Baranovsky

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  1. Alexander M. Wasserman
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  2. Larisa L. Yasina
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  3. Israil I. Aliev
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  4. Veneta Doseva
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  5. Vladimir Y. Baranovsky
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Correspondence to Alexander M. Wasserman.

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M. Wasserman, A., Yasina, L.L., Aliev, I.I. et al. Molecular structure and dynamics of poly(methacrylic acid) and poly(acrylic acid) complexes with dodecyl-substituted poly(ethylene glycol). Colloid Polym Sci 282, 402–406 (2004). https://doi.org/10.1007/s00396-003-0941-y

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  • DOI: https://doi.org/10.1007/s00396-003-0941-y

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