Rheological Properties of Solutions of a Polyampholytic Block Copolymer

  • Tomomitsu Sekitani
  • Kenji Urayama
  • Manabu Tsuruta
  • Masahiko Mitsuzuka
  • Toshikazu TakigawaEmail author
Conference paper
Part of the Progress in Colloid and Polymer Science book series (PROGCOLLOID, volume 136)


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.


Associative polymer Shear thickening Shift of relaxation time Increased relaxation intensity Shear-induced development of microphase separation 



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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Copyright information

© Springer-Verlag Berlin Heidelberg 2009

Authors and Affiliations

  • Tomomitsu Sekitani
    • 1
  • Kenji Urayama
    • 1
  • Manabu Tsuruta
    • 2
  • Masahiko Mitsuzuka
    • 2
  • Toshikazu Takigawa
    • 1
    Email author
  1. 1.Department of Material ChemistryKyoto UniversityNishikyo-kuJapan
  2. 2.R&D CenterMitsui Chemicals Polyurethanes Inc.SodegauraJapan

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