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Rheological Properties of Solutions of a Polyampholytic Block Copolymer

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Book cover Gels: Structures, Properties, and Functions

Part of the book series: Progress in Colloid and Polymer Science ((PROGCOLLOID,volume 136))

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Abstract

Steady shear flow behavior as well as dynamic viscoelsticicity was investigated for solutions of a polyampholytic block copolymer. Benzyl alcohol solutions of the polymer show behavior common to usual polymer solutions, whereas the aqueous solutions form transient networks at short times. Shear thickening and shear thinning emerge on the flow curves of the aqueous solutions at high shear rates. Curves of dynamic loss modulus (G”) for the aqueous solutions move to the long time side by the application of steady shear. The increase in relaxation intensity also occurs by shear. The shift of the G” curves to the long time side disappears but a long time is required for the recovery. The origin of the shear thickening is related not only to the shift of the curves but also to the increase in relaxation intensity. These changes on the G” curves are originated from a developed microphase separation under shear flow.

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Acknowledgements

This work was partly supported by a Grant-in-Aid for Scientific Research on Priority Area “Soft Matter Physics” (No. 19031014) from the Ministry of Education, Culture, Sports, Science and Technology of Japan.

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Authors and Affiliations

  1. Department of Material Chemistry, Kyoto University, Nishikyo-ku, Kyoto, 615-8510, Japan

    Tomomitsu Sekitani, Kenji Urayama & Toshikazu Takigawa

  2. R&D Center, Mitsui Chemicals Polyurethanes Inc., Sodegaura, Chiba, 299-0265, Japan

    Manabu Tsuruta & Masahiko Mitsuzuka

Authors
  1. Tomomitsu Sekitani
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  2. Kenji Urayama
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  3. Manabu Tsuruta
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  4. Masahiko Mitsuzuka
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  5. Toshikazu Takigawa
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Corresponding author

Correspondence to Toshikazu Takigawa .

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Editors and Affiliations

  1. Graduate School of Sciences Dept. Physics, Kyushu University, 6-10-1 Hakozaki, Fukuoka, 812-8581, Japan

    Masayuki Tokita

  2. Graduate School of Human Life Sciences Dept. Food and Human Health Sciences, Osaka City University, 3-3-138 Sugimoto, Osaka, 558-5858, Japan

    Katsuyoshi Nishinari

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© 2009 Springer-Verlag Berlin Heidelberg

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Sekitani, T., Urayama, K., Tsuruta, M., Mitsuzuka, M., Takigawa, T. (2009). Rheological Properties of Solutions of a Polyampholytic Block Copolymer. In: Tokita, M., Nishinari, K. (eds) Gels: Structures, Properties, and Functions. Progress in Colloid and Polymer Science, vol 136. Springer, Berlin, Heidelberg. https://doi.org/10.1007/978-3-642-00865-8_2

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