Investigation of the mutual diffusion in poly(ethylene oxide)/poly(methyl methacrylate) blends by photon correlation spectroscopy

摘要

Photon correlation spectroscopic studies of the mutual diffusion of poly(ethylene oxide)/poly(methyl methacrylate) (PEO/PMMA) blends are carried out. The experimental investigation deals with the measurement of the mutual diffusion coefficient of the PEO/PMMA blend by varying the molecular weight of PEO but keeping the molecular weight of PMMA fixed. At 20percnt; volume fraction of PEO, and high PMMA molecular weight, the mutual diffusion coefficient linearly decreases withMminus;1PEO. The temperature dependence of the mutual diffusion coefficient is nonhyphen;Arrhenius. The Onsager coefficient of mutual diffusion is obtained as a function of temperature.