NMR MEASUREMENT OF THE SURFACE DYNAMICS OF POLY(DIMETHYLSILOXANE) ADSORBED ON SILICA-GEL

Authors
RETHWISCH DG VANALSTEN J DYBOWSKI CR
Citation
Dg. Rethwisch et al., NMR MEASUREMENT OF THE SURFACE DYNAMICS OF POLY(DIMETHYLSILOXANE) ADSORBED ON SILICA-GEL, Macromolecular symposia, 86, 1994, pp. 171-180
Citations number
10
Categorie Soggetti
Polymer Sciences
Journal title
Macromolecular symposia → ACNP
ISSN journal
10221360
Volume
86
Year of publication
1994
Pages
171 - 180
Database
ISI
SICI code
1022-1360(1994)86:<171:NMOTSD>2.0.ZU;2-C
Abstract
CPMAS-DD C-13 NMR spectroscopy was used to examine the mobility of pol y(dimethylsiloxane) adsorbed on silica gel (PDMS/SiO2) at submonolayer coverages. The spin-lattice relaxation time in the rotating frame (T1 (rho)H) decreased linearly with increasing loading. This is consistent with a decrease in the mobility of the polymer segments as the loadin g is increased. The decrease in mobility results from interpolymer int erference. We propose a model that explains these results in terms of a surface intrinsic viscosity that incorporates the polymer-polymer in teractions on the surface.