Abstract
The preparation condition of polystyrene (PS) ultra thin film by a water casting method was investigated on the basis of transmission electron microscopic (TEM) observations. Homogeneous ultra thin films were prepared from a 0.2–2.0 wt% cyclohexanone solution of PS owing to moderate spreadability of the solution on the water surface. The spreading state of the solution on the water surface depending on the dissipation speed of solvent and entanglements among PS chains were in strong relation to formation of the homogeneous ultra thin film. X-Ray interference measurements revealed that the thickness of the ultra thin film was smaller than the dimension of an unperturbed PS chain. Such thinner film than the dimension of the unperturbed chain was defined as 2-dimensional ultra thin film in order to distinguish from 3-dimensional solid film. The radius of gyration of a polymer chain in the 2-dimensional ultra thin film was evaluated from small angle X-ray scattering (SAXS) and small angle neutron scattering (SANS) measurements. PS chains in the 2-dimensional ultra thin film expanded along the direction parallel to the film surface.
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Shuto, K., Oishi, Y., Kajiyama, T. et al. Preparation of 2-Dimensional Ultra Thin Polystyrene Film by Water Casting Method. Polym J 25, 291–300 (1993). https://doi.org/10.1295/polymj.25.291
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DOI: https://doi.org/10.1295/polymj.25.291
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