Abstract
The dynamics of polymer melt can be investigated by observing the return to isotropic state of a piece of melt after a sudden deformation, maintained during all the process of relaxation (a step-strain). This method of transient relaxation is applied to small angle neutron scattering measurements. The very large domain of time which is covered using the time temperature superposition allows to test the different models of dynamics, mainly the Rouse model (chains are assumed to behave as if they were free) and the tube-reptation model, successfully applied for the description of entangled polymer. The possible form factors for oriented polymers are also discussed for the melt as well as for rubbers. The labelling technique (deuteration) is very flexible and allows to observe chains of given molecular weight inside matrices of chains of another molecular weight.
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Boué, F. (1987). Transient relaxation mechanisms in elongated melts and rubbers investigated by small angle neutron scattering. In: Polymer Physics. Advances in Polymer Science, vol 82. Springer, Berlin, Heidelberg. https://doi.org/10.1007/BFb0024042
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DOI: https://doi.org/10.1007/BFb0024042
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