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.
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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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Kaneda, I., Koga, T., Tanaka, F. (2009). Time-Dependent Flow Properties of Transient Hydrogels with Temporal Network Junctions. 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_5
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DOI: https://doi.org/10.1007/978-3-642-00865-8_5
Publisher Name: Springer, Berlin, Heidelberg
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