Please use this identifier to cite or link to this item: https://doi.org/10.1021/jp045538w
Title: Interaction between a nonionic surfactant and a hydrophobically modified 2-hydroxyethyl cellulose
Authors: Bai, D.
Khin, C.C.
Chen, S.B. 
Tsai, C.-C.
Chen, B.-H.
Issue Date: 24-Mar-2005
Source: Bai, D., Khin, C.C., Chen, S.B., Tsai, C.-C., Chen, B.-H. (2005-03-24). Interaction between a nonionic surfactant and a hydrophobically modified 2-hydroxyethyl cellulose. Journal of Physical Chemistry B 109 (11) : 4909-4916. ScholarBank@NUS Repository. https://doi.org/10.1021/jp045538w
Abstract: Interaction between the nonionic surfactant Tergitol 15-S-7 and hydrophobically modified 2-hydroxyethyl cellulose (HMHEC) was studied Theologically in a semidilute regime of HMHEC. The low-shear viscosity of HMHEC was increased with addition of surfactant from 25 to 250 ppm, in which the critical micelle concentration of surfactant was near 39 ppm, and then decreased to a value smaller than that of pure HMHEC with further addition of surfactant to 1000 ppm. An interesting shear-induced phenomenon was observed. The steady-state shear measurements show that there exist crossovers between viscosity-shear rate curves of HMHEC solutions with and without surfactant added, whereas it was not observed in the HEC-surfactant systems. Moreover, added Tergitol 15-S-7 reversed the temperature effect on the viscosity of the HMHEC solution. That is, increasing temperature to or near the cloud point raises the viscosity of the HMHEC - surfactant aggregates, in contrast to the viscosity decrease in the pure HMHEC solutions. A possible mechanism based on the necklace model and the clouding phenomenon is conjecturally introduced to explain such phenomena. © 2005 American Chemical Society.
Source Title: Journal of Physical Chemistry B
URI: http://scholarbank.nus.edu.sg/handle/10635/64116
ISSN: 15206106
DOI: 10.1021/jp045538w
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