Study of the miscibility and the thermal degradation of PVC/PMMA blends |
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| Authors: | Naïma Belhaneche-Bensemra Belkacem Belaabed Abdelmalik Bedda |
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| Institution: | 1. Laboratoire de recherche en sciences et techniques de l'Environnement, Ecole Nationale Polytechnique, BP 182, El-Harrach, Alger, Algérie;2. Ecole Supérieure des Techniciens de l'Aéronautique, Dar-El-Beida, Alger, Algérie |
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| Abstract: | The aim of this paper is to study the miscibility and the thermal degradation of PVC/PMMA blends. For that purpose, blends of variable compositions from 0 to 100 wt% were prepared with and without plasticizer. Their physico-chemical characterization was carried out by differential scanning calorimetric analysis (DSC) and Fourier transform infrared spectroscopy (FTIR). Their thermal degradation under nitrogen at 185°C was studied and the HCl evolved from PVC was measured by the pH method. Degraded samples were characterized, after purification, by FTIR and UV-visible spectroscopy. The DSC analysis showed polymer miscibility up to 60 wt% of PMMA. This miscibility is due to a specific interaction of hydrogen bonding type between carbonyl groups (C=O) of PMMA and hydrogen from (CHCl) groups of PVC as evidenced by FTIR analysis. On the other hand, it was found that PMMA exerted a stabilizing effect on the thermal degradation of PVC by reducing the zip dehydrochlorination and by leading to the formation of short polyenes. |
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