Incommensurate modulation in phase separating binary paraffin mixtures

Small-angle neutron and X-ray scattering (SANS and SAXS) has been measured on C-28-C-36 mixtures quenched from the melt for compositions varying from 15.6:1 to 1:5. Satellite peaks are observed in the SAXS whose offset in Q ( where Q is the scattering vector), relative to Bragg diffraction peaks asso ciated with the average lamellar structure, are composition dependent. The offset is close to the position of the most intense peak observed in the SA NS. A model for the phase separated structure is suggested based on correla ted positional and substitutional disorder.