The determination of glass transition temperature of nanocomposites PVC/CNT    

Jolanta Tomaszewska 1Georg Broza 2Kazimierz Piszczek 1Malgorzata Głuszczenko 1Przemysław Postawa 3Karl Schulte 2Tomasz Sterzyński 4

1. University of Technology and Life Sciences, Faculty of Chemical Technology and Engineering (UTP), Seminaryjna 3, Bydgoszcz 85-326, Poland
2. Technical University Hamburg-Harburg, Institute of Polymers and Composites (TUHH), Hamburg 21073, Germany
3. Częstochowa University of Technology, Armii Krajowej St., Częstochowa 42-200, Poland
4. Poznań Technical University, pl. Marii Skłodowskiej-Curie 5, Poznań 60-965, Poland

Abstract

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 160oC, 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 Tg in the range from 67oC (for the DMTA measurements by 1 Hz) to 96oC (dielectric investigation by 1000 Hz) was noted. In all cases the PVC matrix revealed lower Tg 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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Presentation: Poster at E-MRS Fall Meeting 2008, Symposium F, by Jolanta Tomaszewska
See On-line Journal of E-MRS Fall Meeting 2008

Submitted: 2008-05-21 18:30
Revised:   2009-06-07 00:48
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