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Materiale Plastice (Mater. Plast.), Year 2010, Volume 47, Issue 4,





RADU N. OLARU, DUMITRU MIRCEA VULUGA, FLORENTINA GEORGESCU, EMILIAN GEORGESCU, MIHAI DIMONIE Comparative Characterization of Polyvinyl Alcohols for Vinyl Chloride Suspension Polymerization 2. Thermal Stability


Abstract:
Thermal analysis, mass spectrometry-coupled, of partially hydrolyzed polyvinyl alcohols, for suspension polyvinyl chloride technology, showed that the reduced blockiness of low hydrolyzed product induced a low thermal stability with three degradation stages. When high blockiness is obtained, thermal stabilities in excess of 273°C are attained, regardless the hydrolysis degree. Glass transition of polyvinyl acetate segments is always present for hydrolysis degree ranging from 47.8 to 88.7 mol %. The melting transition is exhibited only by samples with hydrolysis degree higher than 74 mol %. Keywords: polyvinyl alcohol, TGA-MS, thermal stability, polyvinyl chloride



Issue: 2010 Volume 47, Issue 4
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