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Related Experiment Videos

Interaction between a nonionic surfactant and a hydrophobically modified 2-hydroxyethyl cellulose.

Dongshun Bai1, Cho Cho Khin, Shing Bor Chen

  • 1Department of Chemical and Biomolecular Engineering, The National University of Singapore, 10 Kent Ridge Crescent, Singapore 119260.

The Journal of Physical Chemistry. B
|July 26, 2006
PubMed
Summary

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The study reveals how Tergitol 15-S-7 surfactant affects hydrophobically modified 2-hydroxyethyl cellulose (HMHEC) solutions. Surfactant addition initially increases viscosity, then decreases it, with unique shear-induced and temperature-dependent behaviors observed.

Area of Science:

  • Polymer Science
  • Colloid and Surface Chemistry
  • Rheology

Background:

  • Hydrophobically modified 2-hydroxyethyl cellulose (HMHEC) exhibits unique solution properties due to hydrophobic associations.
  • Nonionic surfactants are widely used to modify polymer solution behavior.
  • Understanding polymer-surfactant interactions is crucial for material design and application.

Purpose of the Study:

  • To investigate the rheological impact of Tergitol 15-S-7 surfactant on HMHEC solutions in a semidilute regime.
  • To elucidate the influence of surfactant concentration on HMHEC viscosity and flow behavior.
  • To explore shear-induced phenomena and temperature effects on HMHEC-surfactant systems.

Main Methods:

  • Rheological measurements, including low-shear viscosity and steady-state shear tests.

Related Experiment Videos

  • Systematic variation of Tergitol 15-S-7 surfactant concentration in HMHEC solutions.
  • Temperature-dependent viscosity studies up to the cloud point.

    • Main Results:

    • HMHEC viscosity initially increased with surfactant addition up to 250 ppm (critical micelle concentration ~39 ppm), then decreased.
    • Shear-induced crossovers in viscosity-shear rate curves were observed for HMHEC-surfactant systems, unlike HEC-surfactant systems.
    • Tergitol 15-S-7 reversed the typical temperature-viscosity relationship, increasing viscosity near the cloud point.

    Conclusions:

    • The interaction between Tergitol 15-S-7 and HMHEC leads to complex rheological behaviors.
    • A necklace model and clouding phenomenon are proposed to explain the observed viscosity changes and temperature effects.
    • These findings offer insights into designing and controlling the properties of modified cellulose solutions.