An expression is developed to express experimental ATR infrared absorbance ratios arising from surface enrichment in poly(vinyl methyl ether) (PVME)/polystyrene (PS) blends. Blend surfaces are enriched with PVME, which has the lower surface energy, and are found to have a characteristic depth of order 0.25 × 10-6 m. The effect of stabilizing the blends by hydrogen bonding leads to a reduction in surface enrichment. The surface excess is also calculated using a simplified mean-field approach, and these are compared with experiment. The limitations of ATR spectroscopy for surface studies are highlighted. © 1993 American Chemical Society.
|Number of pages||5|
|Publication status||Published - 1993|