We report a comparative study on the photo-elastic and photo-thermal features of two nanocomposites based on MoS2 nanotubes dispersed into two different polyurea elastomeric matrices, which have different crosslinking properties. The time-resolved laser spectroscopic investigation on these nanocomposites by transient grating (TG) experiments has been performed. The relaxation kinetics on a very wide time scale has been measured from nanosecond to hundred of microseconds. The TG data on both pure polymers shows fast acoustic oscillations and a slow thermal decay. No structural relaxation is appearing in the experimental time window. Surprisingly, the presence of nanotubes in both the polymeric matrixes induces intermediate dynamics clearly detected by the TG signal. The features of this unexpected dynamic features recall the structural relaxation typical of glass-formers but its origin is still unclear.

Investigation of Relaxation Processes in Nanocomposites by Transient Grating Experiments / A. Taschin; P. Bartolini; A. Sánchez-Ferrer; R. Mezzenga; A. Mrzel; R. Torre. - STAMPA. - 714:(2012), pp. 79-83. (Intervento presentato al convegno Conference on Multiphase Polymers and Polymer Composites Systems: Macro to Nano Scales) [10.4028/www.scientific.net/MSF.714.79].

Investigation of Relaxation Processes in Nanocomposites by Transient Grating Experiments

TASCHIN, ANDREA;BARTOLINI, PAOLO;TORRE, RENATO
2012

Abstract

We report a comparative study on the photo-elastic and photo-thermal features of two nanocomposites based on MoS2 nanotubes dispersed into two different polyurea elastomeric matrices, which have different crosslinking properties. The time-resolved laser spectroscopic investigation on these nanocomposites by transient grating (TG) experiments has been performed. The relaxation kinetics on a very wide time scale has been measured from nanosecond to hundred of microseconds. The TG data on both pure polymers shows fast acoustic oscillations and a slow thermal decay. No structural relaxation is appearing in the experimental time window. Surprisingly, the presence of nanotubes in both the polymeric matrixes induces intermediate dynamics clearly detected by the TG signal. The features of this unexpected dynamic features recall the structural relaxation typical of glass-formers but its origin is still unclear.
2012
POLYMER COMPOSITE MATERIALS: FROM MACRO, MICRO TO NANOSCALE
Conference on Multiphase Polymers and Polymer Composites Systems: Macro to Nano Scales
A. Taschin; P. Bartolini; A. Sánchez-Ferrer; R. Mezzenga; A. Mrzel; R. Torre
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Utilizza questo identificatore per citare o creare un link a questa risorsa: https://hdl.handle.net/2158/625186
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