Abstract
Neutron reflectometry data for syndiotactic poly(methyl methacrylate) have been analyzed wing the kinematic approrimation. This has produced form factor and Guinier analyses of the data from which the thickness and composition of films spread at the air-water interface have been determined. The layer thickness remains remarkably constant at ca. 18 (±2) A over a surface concentration ranging from 0.2 to 2.0 mg m -2 . Water is always contained in the film at a very small volume fraction (≃ 0.1), the polymer volume fraction increases linearly with surface concentration up to ca. 1.5 mg/m 2
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