Internal Viscosity and Quasielastic Scattering

The hypotheses leading to internal viscosity of polymers are formulated in terms of the neutron incoherent quasielastic scattering law. The mean squared displacement, calculated in the free draining limit, is obtained as an analytical function of the internal viscosity parameter and is shown to decr...

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Bibliographic Details
Published in:The Journal of chemical physics 1971-01, Vol.54 (9), p.3717-3720, Article 3717
Main Authors: Bidaux, R., Cotton, J. P., Farnoux, B., Jannink, G.
Format: Article
Language:English
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Summary:The hypotheses leading to internal viscosity of polymers are formulated in terms of the neutron incoherent quasielastic scattering law. The mean squared displacement, calculated in the free draining limit, is obtained as an analytical function of the internal viscosity parameter and is shown to decrease uniformly as this parameter increases. As a consequence, the half-width at half-maximum of the quasielastic scattering law deviates from the q4 behavior predicted for the free chain, and increases less rapidly. The observation of the half-width will be more difficult for this reason. However, the time scale associated with motions reflecting internal viscosity is smaller and therefore more suitable for a neutron scattering experiment.
ISSN:0021-9606
1089-7690
DOI:10.1063/1.1675418