Carbonate from thermal degradation, analysis

More detailed product information was provided by Uemichi et al. who used a fixed bed flow reactor to examine the decomposition of polypropylene in the presence of silica-alumina.Detailed product analysis was carried out for compounds with 16 or fewer carbon atoms, resolving the products into normal alkanes, isoalkanes, alkenes and aromatics. For a reaction temperature of 750 K, a catalyst weight of 3.0 g and a polypropylene feed rate of 0.150 g min , the polymer was converted over 95% to low molecular weight products, forming C4 and C5 isoalkanes and alkenes in the highest yields. The overall carbon number distribution for reaction over SA is summarized in Figure 4, in which thermal degradation results for even more severe conditions of 799 K and a feed rate of 0.116 g min are included for comparison. The increased rate of conversion and the shift of the product distribution to lower carbon numbers are apparent from this plot. 

Chrissafis et al. [302] compared four different nanopartides to produce nanobiocomposites based on PLA two layered silicates (Cloisite Na and Qoisite 20A MMTs), spherical nanopartides (fumed silica Si02) and MWCNTs. AH nanopartides induced a substantial enhancement of Young s modulus and TS compared to neat PCL. From TGA analysis it was also observed that modified MMT and fumed silica accelerate the decomposition of PCL owing to respective aminolysis and hydrolytic reactions. On the other hand, carbon nano tubes and unmodified MMT slowed the thermal degradation of PCL due to a shielding effect. 

Thermal stability is a crucial factor when polysaccharides are used as reinforcing agents because they suffer from inferior thermal properties compared to inorganic fillers. However, thermogravimetric analysis (TGA) of biocomposites suggested that the degradation temperatures of biocomposites are in close proximity with those of carbon black composites (Table-1). 

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