Ellipsoidal polystyrene latex particles, a few micrometres in length and very suitable for use as models for colloid studies, have been prepared and characterized. Polystyrene spheres were embedded in poly(vinyl alcohol) (PVA) and the resulting film stretched at 200°C to two film draw ratios, 1.4 and 2.35. The deformed particles were examined by light scattering and some were extracted for transmission electron microscopy. The light scattering results, analysed using Rayleigh-Gans theory, were in very good agreement with the electron microscopy. The ellipsoids were biaxial (within the limits of experimental error). Those deformed to the highest draw ratio deviate slightly from true ellipsoids, having rather sharper ends. The PVA deforms by a process of necking, which is non-uniform on a large scale, so that over the whole film there can be a considerable variation in draw ratio. However, particles recovered from any small, local area of the PVA film show a size distribution almost as uniform as that of the starting material. The effective draw ratio of the particles is found to be considerably greater than that of the matrix
Посилання на статтю:
Morphology of ellipsoidal latex particles / C. C. Ho*, M. J. Hill and J. A. Odell // Polymer. – 1993. – Vol 34. – P. 2019-2023.