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Time-Dependent Flow Properties of Transient Hydrogels with Temporal Network Junctions

  • Isamu KanedaEmail author
  • Tsuyoshi Koga
  • Fumihiko Tanaka
Conference paper
Part of the Progress in Colloid and Polymer Science book series (PROGCOLLOID, volume 136)

Abstract

The nonlinear rheological behavior under startup shear flows in aqueous solutions of telechelic hydrophobically ethoxylated urethane carrying branched alkyl end-chains, 2-decyl-tetradecyl, (referred to as C24-HEUR) was studied by strain-controlled rheomery. Unusual stress upturn (known as strain hardening), followed by the stress overshoot, was observed for 3 wt% aqueous solution above a critical shear rate. The phenomenon is explained by our recent transient network theory in terms of nonlinear chain stretching occurring during the stress build-up. Upon addition of glycerol, the relaxation time was shortened, while the equilibrium modulus increased with the concentration of glycerol. The stress upturn disappeared above a certain value of the glycerol concentration, strongly suggesting that glycerol affects the dynamics of the transient network through the interaction with the micellar junctions.

Keywords

HEUR Strain hardening Glycerol Transient network Stress growth 

Notes

Acknowledgment

This work is partially supported by a Grant-in-Aid for Scientific Research (B)19350057 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

  1. 1.Department of Food ScienceRakuno Gakuen UniversityHokkaidoJapan
  2. 2.Graduate school of TechnologyKyoto UniversityKyotoJapan

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