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Published online by Cambridge University Press: 16 May 2011
This chapter applies the thermodynamic and rheological theories developed so far to the specific important network-forming associating polymer solutions. The topics include modification of the phase separation and gelation of associating polymers by added surfactants, transition from intramolecular association to intermolecular association, competitive and coexisting hydration and hydrophobic association, and thermoreversible gelation strongly coupled to the polymer conformational change. With an increase in the number of components, or the degree of freedom in the system, phase transitions and flow properties become complex. However, the basic ideas to treat them stay within the fundamental theoretical framework presented in the preceding chapters. All systems are modeled from a unified point of view.
Polymer–surfactant interaction
The problem of the interaction between polymers and surfactants was laid initially in the study of proteins associated with natural lipids, and later extended to their association with synthetic surfactants [1, 2]. More recently, the interaction of water-soluble synthetic polymers such as poly(ethylene oxide) with ionic and non-ionic surfactants [3–7] has attracted the interest of researchers because of its scientific and technological implications.
Adding surfactants to polymer solutions, or vice versa, followed by the formation of a polymer/surfactant complex, can substantially alter the original physical properties substances involved.
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