Mutual Diffusivities of Binary Mixtures of Water and Poly(ethylene) Glycol from Heterodyne Dynamic Light Scattering

Abstract In the present study, mutual diffusivity D 11 in binary mixtures of water with technical polydisperse poly(ethylene) glycol (PEG) blends molar masses (1000, 4000, or 6000) g⋅mol −1 as well a purified monodisperse PEG homolog polymerization number 21 and mass 943 was investigated by heterodyne dynamic light scattering (DLS) function temperature and/or concentration. The measured for 1000 pure match within experimental uncertainties agree available literature data. decreases increasing PEGs at constant weight fraction. For it could be shown that increases exhibits nonlinear concentration dependence. This study demonstrates DLS can applied reliable determination aqueous solutions over broad range fractions from 0.01 up to solubility limit an average expanded uncertainty ( k = 2) 5.5 %. Moreover, results show are suitable model systems studying diffusion behavior bimodal also multimodal particulate systems.