Compatibility of a statistical copolymer P(EMA-co-MMA) with PS and PMMA

The compositions of coexisting phases and the interface widths in blends of a statistical copolymer of poly(ethylmethacrylate - co methylmethacrylate) (P(EMA(1-x)-co-MMA(x))) and a deuterated polystyrene (PS(D)) as well as a deuterated poly(methylmethacrylate) (PMMA(D)) have been investigated by neu tron reflectometry (NR). Interaction parameters are calculated from the com positions of coexisting phases and the interface width values. Utilizing a novel two dimensional scheme for graphical representation of the interactio n parameters, the results are in very good agreement with studies on the in teraction parameters for PS/PMMA, PS/PEMA and PEMA/PMMA blends. In particul ar, chi(EMA/MMA) deduced from a NR experiment on a P(EMA-block-MMA(D)) dibl ock copolymer fits excellent into the scheme.