INVESTIGADORES
VILLAR Marcelo Armando
artículos
Título:
Doble Quantum NMR Applied to Polymer Networks with Low Concentration of Pendant Chains
Autor/es:
R.H. ACOSTA; G.A. MONTI; D.A. VEGA; M.A. VILLAR; E.M. VALLÉS
Revista:
MACROMOLECULES
Editorial:
American Chemical Society
Referencias:
Lugar: Washington D.C., USA; Año: 2006 vol. 39 p. 4788 - 4792
ISSN:
0024-9297
Resumen:
The influence of pendant chains at low concentrations in poly(dimethylsiloxane) networks is studied using double quantum proton nuclear magnetic resonance. Small relative variations of the average molecular weight of the elastically active chains, the molecular weight of pendant chains, and the concentration of pendant chains were analyzed. Changes induced by these defects in the residual dipolar couplings are related to changes in the viscoelastic relaxation times and compared against the behavior of the elastic shear modulus. A very good correlation between NMR measurements and the corresponding rheological experiments is found.
