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Heterogeneity of Nanofilled EPDM Elastomers Investigated by Inverse Laplace Transform 1 H NMR Relaxometry and Rheometry
Author(s) -
Moldovan Dumitrita,
Fechete Radu,
Demco Dan Eugen,
Culea Eugen,
Blümich Bernhard,
Herrmann Volker,
Heinz Manfred
Publication year - 2010
Publication title -
macromolecular chemistry and physics
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.57
H-Index - 112
eISSN - 1521-3935
pISSN - 1022-1352
DOI - 10.1002/macp.201000086
Subject(s) - relaxometry , rheometry , elastomer , materials science , composite material , filler (materials) , relaxation (psychology) , polymer , inverse laplace transform , polymer chemistry , laplace transform , polymer science , spin echo , mathematics , magnetic resonance imaging , medicine , psychology , social psychology , mathematical analysis , radiology
The heterogeneous effects due to filler interactions and chain dynamics of reinforcing nano‐filler particles were characterized on a series of filled EPDM elastomers using the Payne effect and low field NMR, 1 H transverse ( T 2 ), longitudinal ( T 1 ) and longitudinal in rotating frame ( T 1ρ ) relaxation time measurements. Measurement of the Payne effect and NMR relaxation curves were used to obtain the distribution of filler/filler interactions and chain dynamics by one‐dimensional Laplace inversion. Distributions of shear‐strain constants in the Payne effect reveal the existence of weak, medium and strong filler/filler interactions which were correlated to filler properties and content. The analysis of relaxation‐time distributions leads to the identification of multimodal polymer network dynamics.