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NMR measurement of the surface dynamics of poly(dimethylsiloxane) adsorbed on silica gel
Author(s) -
Rethwisch David G.,
van Alsten John,
Dybowski Cecil R.
Publication year - 1994
Publication title -
macromolecular symposia
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.257
H-Index - 76
eISSN - 1521-3900
pISSN - 1022-1360
DOI - 10.1002/masy.19940860114
Subject(s) - polymer , adsorption , materials science , chemical engineering , relaxation (psychology) , polymer chemistry , copolymer , viscosity , chemistry , composite material , psychology , social psychology , engineering
CPMAS‐DD 13 C NMR spectroscopy was used to examine the mobility of poly(dimethylsiloxane) adsorbed on silica gel (PDMS/SiO 2 ) at submonolayer coverages. The spin‐lattice relaxation time in the rotating frame (T 1ρH ) decreased linearly with increasing loading. This is consistent with a decrease in the mobility of the polymer segments as the loading is increased. The decrease in mobility results from interpolymer interference. We propose a model that explains these results in terms of a surface intrinsic viscosity that incorporates the polymer‐polymer interactions on the surface.