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Polymer stabilisers for temperature-induced dispersion gelation: versatility and control
Cristina Alava1, Brian R Saunders
1School of Materials, The University of Manchester, Grosvenor Street, Manchester M1 7HS, UK.
Journal of Colloid and Interface Science
|July 19, 2005
Summary
This study introduces poly(NIPAM-co-PEGMa) for temperature-triggered gelation in butadiene-acrylonitrile latex. The polymer surfactant enables versatile, predictable gelation in dispersions, offering a new method for material science applications.
Area of Science:
- Polymer Science
- Materials Science
- Colloid and Surface Chemistry
Background:
- Temperature-responsive polymer surfactants are crucial for developing smart materials.
- Understanding gelation mechanisms in dispersions is key for controlling material properties.
Purpose of the Study:
- To investigate the temperature-induced gelation of butadiene-acrylonitrile latex using poly(N-isopropylacrylamide-co-poly(ethylene glycol)methacrylate) (poly(NIPAM-co-PEGMa)).
- To compare the gelation behavior with oil-in-water emulsions and analyze the effect of anionic surfactants.
Main Methods:
- Investigated temperature-induced gelation of butadiene-acrylonitrile latex with poly(NIPAM-co-PEGMa).
- Compared latex gelation with oil-in-water emulsions, examining the influence of sodium dodecylbenzene sulfonate (NaDBS).
- Applied mathematical predictive theory for emulsion gelation to latex data.
Main Results:
- Latex gelation temperature (T(gel)) matched the polymer's cloud point temperature (T(cpt)).
- T(gel) in latex was less affected by NaDBS compared to emulsions.
- Mathematical theory showed a good fit for latex gelation (T(gel) ∝ 1/C(p)), with distinct mechanisms for latex and emulsion gelation.
Conclusions:
- Poly(NIPAM-co-PEGMa) offers a versatile method for temperature-triggered gelation in dispersions.
- The study provides a theoretical framework for predicting gelation temperatures in such systems.
- Differences in gelation mechanisms are attributed to latex surface area, particle separation, and electrolyte presence.