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  • Author or Editor: H. Couderc x
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Abstract  

Measurements have been performed on poly(ethylene terephthalate)glycol/montmorillonite nanocomposites with different filler contents using differential scanning calorimetry (DSC) and temperature modulated differential scanning calorimetry (TMDSC). According to the strong-fragile concept proposed by Angell, we have determined the values of the fragility index m. In a second time, we have calculated the average size of a cooperative rearranging region (CRR) z(T g) at the glass transition according to the definition proposed by Solunov. However, z(T g is a dimensionless quantity and then only allows a comparative study between different samples. To calculate the average number of monomer units by CRR noted N α, we have used the method developed by Donth. The results show that the presence of montmorillonite in PETg matrice implies modifications on structural relaxation phenomena. Furthermore, we have shown that z(T g and N α values have the same evolution in function of filler content.

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