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The heterogeneity of segmental dynamics of filled EPDM by (1)H transverse relaxation NMR
D Moldovan1, R Fechete, D E Demco
1Technical University of Cluj-Napoca, Daicoviciu 1, R-400020 Cluj-Napoca, Romania.
Abstract:
Residual second moment of dipolar interactions M(2) and correlation time segmental dynamics distributions were measured by Hahn-echo decays in combination with inverse Laplace transform for a series of unfilled and filled EPDM samples as functions of carbon-black N683 filler content. The fillers-polymer chain interactions which dramatically restrict the mobility of bound rubber modify the dynamics of mobile chains. These changes depend on the filler content and can be evaluated from distributions of M(2). A dipolar filter was applied to eliminate the contribution of bound rubber. In the first approach the Hahn-echo decays were fitted with a theoretical relationship to obtain the average values of the (1)H residual second moment
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