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NMR measurements of gaseous sulfur hexafluoride (SF 6 ) to probe the cross‐linking of EPDM rubber
Author(s) -
Terekhov M.,
Neutzler S.,
Aluas M.,
Hoepfel D.,
Oellrich L. R.
Publication year - 2005
Publication title -
magnetic resonance in chemistry
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.483
H-Index - 72
eISSN - 1097-458X
pISSN - 0749-1581
DOI - 10.1002/mrc.1648
Subject(s) - chemistry , sulfur hexafluoride , sorption , natural rubber , relaxation (psychology) , polymer chemistry , polymer , desorption , analytical chemistry (journal) , organic chemistry , psychology , social psychology , adsorption
The effects of embedding gaseous SF 6 into EPDM rubber were investigated using NMR methods. It was found that observed sorption and desorption processes follow the behavior of the dual mode sorption model. A strong correlation was found between EPDM cross‐linking and transversal relaxation time of embedded SF 6 . EPDM samples with different cross‐link densities, preliminarily determined by 1 H transversal relaxation using the Gotlib model and Litvinov's method, were investigated using embedded SF 6 . The sensitivity of the 19 F transversal relaxation rate of SF 6 to the EPDM cross‐link density variation was found to be at least 10 times higher than for 1 H in the polymer chain. First experiments on probing the swelling effects in EPDM due to its contact with polar liquids have been performed. Copyright © 2005 John Wiley & Sons, Ltd.