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Thermodynamic Suppression of Brownian Motion

Thermodynamic Suppression of Brownian Motion

M Geoghegan, T Russ, R Brenn

Phys Rev Lett. 2001 Mar 19;86(12):2581-4.

PMID: 11289985

Abstract:

We have used helium-3 nuclear reaction analysis to measure the Brownian motion (intradiffusion coefficient) of polystyrene in a partially miscible blend with poly(alpha-methylstyrene). In the one-phase region, when the correlation length is close to the polystyrene chain size, the intradiffusion coefficient falls to half of its thermal value. For larger and smaller values of the correlation length, diffusion is normal. These results show that the correlation length of a polymer blend constrains polymer diffusion, as suggested from previous neutron scattering measurements, and mean-field theory.

Chemicals Related in the Paper:

Catalog Number	Product Name	Structure	CAS Number	Price
AP25014317	Poly(α-methylstyrene)		25014-31-7	Price

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