Configurational diffusion in semidilute solutions
Dynamic light scattering measurements of the relaxation times of internal modes of single polymer chains in semidilute solution are reported for dilute high molecular weight polystyrene in a semidilute poly(vinylmethylether)/toluene host. Since PVME is index matched by toluene, these light scattering measurements probe the dynamics of the isolated polystyrene chains and are insensitive to the collective fluctuations of the PVME host. The principle result is that the Rayleigh linewidth scales like the third power of the momentum transfer regardless of the concentations of the semidilute polymer. This is in apparent contradiction to current theories of hydrodynamic screening in semidilute solutions, which predict a fourth power dependence for the linewidth.
- Research Organization:
- Sandia National Laboratories, Albuquerque, NM 87185
- OSTI ID:
- 5954054
- Report Number(s):
- CONF-850778-
- Journal Information:
- AIP Conf. Proc.; (United States), Journal Name: AIP Conf. Proc.; (United States) Vol. 137:1; ISSN APCPC
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
360404* -- Materials-- Polymers & Plastics-- Physical Properties-- (-1987)
ALKYLATED AROMATICS
AROMATICS
DIFFUSION
DISPERSIONS
DYNAMICS
ETHERS
FLUID MECHANICS
HYDROCARBONS
HYDRODYNAMICS
LIGHT SCATTERING
LINE WIDTHS
MATERIALS
MECHANICS
METHYL ETHER
MIXTURES
MOLECULAR STRUCTURE
MOLECULAR WEIGHT
MOMENTUM TRANSFER
ORGANIC COMPOUNDS
ORGANIC OXYGEN COMPOUNDS
ORGANIC POLYMERS
PETROCHEMICALS
PETROLEUM PRODUCTS
PLASTICS
POLYMERS
POLYOLEFINS
POLYSTYRENE
POLYVINYLS
RELAXATION TIME
SCATTERING
SCREENING
SOLUTIONS
SYNTHETIC MATERIALS
TOLUENE