Molecular weight effects in the relaxation of orientation of polystyrene chains as revealed by infrared dichroism

The relaxation of orientation of narrow distribution polystyrenes of different molecular weights is studied over four decades of time by infrared dichroism and compared to the predictions of the Doi--Edwards and related models. The behavior at short times appears to be independent of the molecular w...

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Bibliographic Details
Published in:Macromolecules 1988-06, Vol.21 (6), p.1846-1854
Main Authors: Tassin, Jean Francois, Monnerie, Lucien
Format: Article
Language:English
Subjects:
Applied sciences
Exact sciences and technology
Organic polymers
Physicochemistry of polymers
Properties and characterization
Structure, morphology and analysis
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Summary:The relaxation of orientation of narrow distribution polystyrenes of different molecular weights is studied over four decades of time by infrared dichroism and compared to the predictions of the Doi--Edwards and related models. The behavior at short times appears to be independent of the molecular weight, whereas molecular weight effects at longer time are observed, as predicted by the theory. A careful comparison between theory and experiment shows that the kinetics of the relaxation at short times are slower than predicted by the model. The experimental behavior at longer times is in good agreement, especially for the highest molecular weights, with the predictions of a self-consistent treatment including a process of equilibration across slip-links. 34 ref.--AA
ISSN:0024-9297
1520-5835
DOI:10.1021/ma00184a052