The diffusion of highly cross-linked, nearly monodisperse polystyrene latex spheres of 0.2-/tm radius in the presence of linear polystyrene as the matrix polymer in the moderately good solvent JV.1Vdimethylformamide at 25 °C was determined by quasi-elastic light scattering as a function of matrix concentration and molecular weight. This is the first report of a latex probe in trace amounts diffusing in an organic solvent, and with a matrix polymer chemically similar to the probe. The latex diffusion diminished monotonically with matrix concentration, which varied from moderately dilute solutions into the semidilute regime up to a matrix concentration of 8 times c*. Stokes-Einstein behavior was observed at all matrix concentrations and for both matrix molecular weights (2.15 x 10s and 1.1 X 106), within experimental error. In the semidilute region the entanglement relaxation was always much faster than probe motion. The diffusion data fit the scaling law D/D<¡ = exp(-ac'Af1'), with v equal to 0.99 and y equal to 0.49. Comparison is made to diffusion of latex probes in aqueous dispersants, and of silica probes in organic dispersants.
scite is a Brooklyn-based organization that helps researchers better discover and understand research articles through Smart Citations–citations that display the context of the citation and describe whether the article provides supporting or contrasting evidence. scite is used by students and researchers from around the world and is funded in part by the National Science Foundation and the National Institute on Drug Abuse of the National Institutes of Health.
hi@scite.ai
10624 S. Eastern Ave., Ste. A-614
Henderson, NV 89052, USA
Copyright © 2024 scite LLC. All rights reserved.
Made with 💙 for researchers
Part of the Research Solutions Family.