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   kinetics of thermal degradation of pmma-based dental resins scraps  
   
نویسنده dos santos jr paulo ,da silva ribeiro haroldo jorge ,ferreira caio campos ,bernar lucas pinto ,bremerc sammy jonatan ,de castro douglas alberto rocha ,ferreira armando costa ,da silva conceição de maria sales ,costa maria elizabeth gemaque ,santos marcelo costa ,junior sergio duvoisin ,borges luiz eduardo pizarro ,machado nélio teixeira
منبع asian journal of green chemistry - 2020 - دوره : 4 - شماره : 2 - صفحه:202 -219
چکیده    in this work, the cross-linked ppma-based dental resins scraps were applied to pyrolysis to recover mma (methyl methacrylate). thermal degradation of the cross-linked ppma-based dental resins scraps was analyzed using tg/dtg to guide the operating condition. the reaction liquid products which were obtained at 30, 40, 50, 60, 70, 80, and 110 min, were physicochemically characterized for density, kinematic viscosity, and refractive index. the chemical composition of the reaction liquid products, obtained at 30, 40, 50, 60, 70, 80, and 110 min, was determined by gc-ms. the liquid phase yield was 55.50% (wt), while that of the gas phase was 31.69% (wt). the density, kinematic viscosity and refractive index of the reaction liquid products which were obtained at 30, 40, 50, 60, 70, 80, and 110 min, varied between 0.9227 and 0.9380 g/ml, 0.566 and 0.588 mm2/s, and 1.401 and 1.414, respectively. moreover, it shows the percentage errors at the range of 0.74-2.36%, 7.40-10.86%, and 0.00-0.92%, respectively, as compared to the standard values for density, kinematic viscosity, and refractive index of pure mma (methyl metaclylate) at 20 °c. the gc-ms, identified in the reaction liquid products during pyrolysis, esters of carboxylic acids, alcohols, ketones, and aromatics, shows concentrations of mma (methyl metaclylate) between 88.003 and 98.975% (area). the concentrations of mma (methyl metaclylate) in the liquid phase, between 30 and 80 min, reach purities above 98% (area), decreasing drastically with increasing the reaction time after 100 min. thus, it will be possible to depolymerize the cross-linked ppma-based dental resins scraps by pyrolysis in order to recover mma (methyl methaclylate).
کلیدواژه pmma ,pyrolysis ,process analysis ,kinetics ,recovery of mma
آدرس ufpa, faculty of odontology, brazil, ufpa, institute of technology, faculty of chemical engineering, brazil, ufpa, institute of technology, faculty of chemical engineering, brazil, ufpa, institute of technology, faculty of chemical engineering, brazil, htw-berlin, germany, ufpa, institute of technology, faculty of chemical engineering, brazil, ufpa, faculty of odontology, brazil, ufpa, faculty of odontology, brazil, ufpa, faculty of odontology, belém-brazil, brazil, ufpa, institute of technology, faculty of chemical engineering, brazil, uea, faculty of chemical engineering, brazil, ime-rj, section of chemical engineering, brazil, ufpa, institute of technology, faculty of chemical engineering, brazil
پست الکترونیکی machado@ufpa.br
 
 

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