Report No 1951/AP - Instytut Fizyki JÄ drowej PAN

PROTON NMR STUDIES OF MOLECULAR DYNAMICS
IN POLYDIMETHYLSILOXANE
Mariusz Jancelewicz, Hieronim Maciejewski*, and Stefan Jurga.
Institute of Physics, Adam Mickiewicz University, Umultowska 85,
PL- 61614 Poznan, Poland.
*Poznan Science and Technology Park, Rubiez 46, PL-61612 Poznan, Poland.
Polydimethylsiloxane (PDMS) belongs to a group of polymers containing a silicon –
oxygen skeleton with methyl groups on the silicon atom (see molecular structure). Major
application for PDMS is as lubricant oils and as plasticiser in silicon jointing compounds in
the construction industry.
In this paper we present results of measurements
of the magnetic relaxation time T 1 in the frequency
domain, results of DSC and rheology measurements.
T 1 1 H NMR relaxation dispersion of the PDMS has
been measured by Fast Field Cycling technique in
the Larmor frequency range from 10 kHz up to 12
MHz. Results of dispersion measurements indicate
the T 1 dependence according to Rouse model [1,2].
Molecular structure of PDMS
(red – oxygen; violet – silicon;
black – carbon; blue - hydrogen).
References:
[1] N. Fatkullin, R. Kimmich, E. Fischer, C. Mattea, U. Beginn, M. Kroutieva;
The confined-to-bulk dynamics transition of polymer melts in nanoscopic pores of solid
matrices with varying pore diameter; New Journal of Physics 6 (2004) 46.
[2] R. Kimmich, N. Fatkullin, E. Fischer, C. Mattea, U. Beginn;
Reptation in Artificial Tibes and the Corset Effect of Confined Polymer Dynamics;
Mat. Res. Soc. Symp. Proc. Vol. 790.
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