The investigation of the glass transition temperature was realized by DMTA and dielectric losses measurements, for the nanocomposites of PVC with CNT. The matrix of the nanocomposites was prepared by the dry blend procedure, of PVC S 70 Polanwil (Anwil Poland) 100 wt.%, plasticizer DINP (Exxon, Germany) 10 wt. % and tin stabilizer MOK 17 (Accros, Belgium) 4 wt.%.

The CNT (Nanocyl, Belgium) in a concentration of 0.01 wt. % to 0.05 wt.% were homogenized by use of a sonificator, and introduced to the PVC composition.  The gelification of the PVC/CNT composites was performed by means of a Brabender kneader operating by 160^oC, during 10 minutes. The final samples were produced by milling, followed by pressure moulding, in a form of plates with a thickness of 3 mm for the DMTA measurements, and as a film with a thickness of 0.5 mm for the dielectric investigations.

The measurements were realized by two DMTA bending frequencies (1 and 10 Hz) and by dielectric field frequency of 1000 Hz. The position of the tg d maximum was taken as the glass transition temperature.

We have observed the dependence of the loss factor (tg d) on the applied measurement frequency. With increasing frequency an increase of T_g in the range from 67^oC (for the DMTA measurements by 1 Hz) to 96^oC (dielectric investigation by 1000 Hz) was noted. In all cases the PVC matrix revealed lower T_g comparing with corresponding composites with CNTs. These phenomena may be explained by the composition dependent changes of chain mobility, and particularly to certain intermolecular interaction between the PVC matrix and the carbon nanotubes. 

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