Abstract
Hydrophobic polymers with low glass transition temperature (polyisoprenes) and a single head group (sulfonate) have been synthesized and characterized as insoluble monolayers on a water surface. A single ionic head group is sufficient to make these hydrophobic polymers surface-active and isotherms of an expanded type have been recorded.
These isotherms can be described quantitatively using a theory based on constant density of the hydrophobic region, Gaussian chain statistics and affine deformation: At a fixed area per head group, the surface pressure is proportional to the length of the hydrophobic tail. The slope of this relation is proportional to the third power of the area per head group.
Chains shorter than 300 repeat units systematically deviate from the theory.
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Goedel, W.A., Heger, R. (1997). Hydrophobic polymers, tethered to the water surface I: fluid monolayers. In: Rosenholm, J.B., Lindman, B., Stenius, P. (eds) Trends in Colloid and Interface Science XI. Progress in Colloid & Polymer Science, vol 105. Steinkopff. https://doi.org/10.1007/BFb0110981
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DOI: https://doi.org/10.1007/BFb0110981
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