Polymer forces

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Polymer ordering at surfaces

Israelachvili, Fig. 13.13

PEO has an “inverse” water solubility – it becomes less soluble at higher temperatures.

A general principle:

The less soluble the adsorbed polymer – the less stable the dispersion.

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MW and temperature effects

Israelachvili, Fig. 14.5

Polystyrene polymers on mica.

(a) End-grafted in toluene, (b) Adsorbed from cyclohexane.

Both solubility and bridging effects are possible in (b)

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Polymers at surfaces

Israelacvili, Fig. 14.5

• (a) In solution
• (b) End-grafted
• (c) Adsorbed
• (d) Adsorbed at low &thetha;
• (e) Adsorbed at high &thetha;
• (f) Bridging

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Bibliography

• Bäkker, G. Kapillarität und oberflächenspannung; Akademische Verlagsgesellschaft: Leipzig. 1928.
• de Gennes, P.-G.; Brochard-Wyart, F.; Quéré, D. Capillarity and wetting phenomena. Springer: New York; 2002.
• Derjaguin, B.V.; Churaev, N.V.; Muller, V.M. Surface forces; * Consultants Bureau: New York; 1987.
• Gaines, Jr., G.L. Insoluble monolayers at liquid-gas interfaces. John Wiley & Sons: New York; 1966.
• Hirschfelder, J.O.; Curtiss, C.F.; Bird, R.B. Molecular theory of gases and liquids. John Wiley & Sons: New York; 1954.
• Israelachvili, J.N. Intermolecular and surface forces, 2nd ed.; Academic Press: New York; 1992.
• Jones, A.L. Soft condensed matter. Oxford University Press: New York; 2002.
• Parsegian, V.A. van der Waals forces. Cambridge University Press: New York; 2006.
• Tanford, C. The hydrophobic effect: Formation of micelles and biological materials. John Wiley & Sons: New York; 1980.
• van der Waals, J.D. On the continuity of the gaseous and liquid states. Rowlinson, J.D., Ed.; Dover Publications: Mineola, NY; 1988.

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