Rheological behaviour nanocomposites

Rheological Behaviour of Natural Rubber Based Composites and Nanocomposites... 

This chapter mainly deals with the rheological behaviour of NR nanocomposites. In the following sections there will be a broad overview about the various rheological phenomena observed in NR nanocomposites. 

G. Camino, M. Zanetti, A. Riva, M. Braglia, and L. Falqui, Thermal degradation and rheological behaviour of EVA/montmorillonite nanocomposites. Polymer Degradation... 

Camino, G. Zanetti, M. Riva, A. Braglia, M. Falqui, L. Thamal degradation and rheological behaviour of EVA/montmorillonite nanocomposites. Polym. Degrad. Stab. 2002, 77, 299-304. 

The rheological behaviour of organoclay-filled epoxy resins prior to cure can significantly influence the processing of the nanocomposite and therefore the properties of the final material. Becker et investigated the effect of an... 

Melt rheological properties of PCL-based nanocomposites were first reported by Krishnamoorti and Giannelis in the case of delaminated structures prepared by in-situ intercalative polymerization. Recently, Lepoittevin et a/. reported the detail melt rheology properties of PCL-based nanocomposites prepared by melt intercalation method. The rheological behaviour of the PCL filled with 3wt.% of MMT-AIk and MMT-(OH)2 was significantly different compared to the unfilled PCL and PCL/MMT-Na nanocomposites, for which the power law observed at low frequencies agrees with expectation for thermoplastics. The frequency dependence of G and G" was, however, perturbed by organically modified MMT. The effect was dramatic in the case of G which drops from 2 to 0.14 and 0.24 for MMT-(OH)2 and MMT-AIk, respectively. 

Hadjistamov (1999) examined the effect of nanoscale silica on the rheology of silicone oil and uncured epoxy-resin (araldite) systems. Shear thickening and yield-stress-like behaviour were observed and found to be due to a build-up of network structure associated with the nanocomposite phase. 

Relaxation in Nanocomposites. At concentrations above the percolation threshold polymer/nanoparticle interactions dominate the viscoelastic terminal behaviour of polymer nanocomposites. As has been reported for phenoxy based nanocomposites [8], the analysis of tan 5 relaxation at low frequencies constitutes a reliable rheological method to investigate the strength of phenoxy/nanoclay interactions. Moreover, since coordinates ((o)Max (tan 5)Max)) reflect the blocking effect of nanoparticles on polymer chains, the dependence of (o)Max with nanoparticles volume fraction can be used in the percolation equation X=Xq (volume fraction threshold [Pg.69]

Sinha Ray S, Okamoto K, Okamoto M (2006), Melt rheology and strain induced hardening behaviour of biodegradable poly(butylene succinate)/synthetic fluorine mica nanocomposites , Langmuir, submitted. 

---