NMR measurement of the surface dynamics of poly(dimethylsiloxane) adsorbed on silica gel | Zendy

Rethwisch David G. | Zendy; van Alsten John | Zendy; Dybowski Cecil R. | Zendy

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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.

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