Oral Health and Dental Management

Brazil

Publications

• Research Article   
  Recovery of MMA by Depolymerization of PMMA-Based Dental Resins Scraps Rosettes (Retraction Note)
  Author(s): Armando Costa Ferreira, Haroldo Jorge da Silva Ribeiro, Paulo Bissi dos Santos Jr, Maria Elizabeth Gemaque Costa, Conceição de Maria Sales da Silva, Douglas Alberto Rocha de Castro, Marcelo Costa Santos, Sergio Du-voisin Jr, Luiz Eduardo Pizarro Borges and Nélio Teixeira Machado*
  
  This work aims to investigate the influence of temperature on the recovery and purity of Methyl Methacrylate (MMA) by depolymerization of Polymethyl Methacrylate (PMMA) dental resins scraps. The experiments were carried out at 350˚C, 400˚C, and 450˚C, 1.0 atm. in laboratory scale, using a borosilicate glass reactor of 125 mL. The density, kinematic viscosity, acidity and refractive index of liquid products were determined experimentally. The chemical compositions of liquid products were determined by GC- MS. The experiments show liquid phase yields between 48.76% and 94.74% (wt.), showing a 1st order exponential growth behavior, increasing with increasing temperature, while that of solid phase (coke) varied between 0.68% and 38.83% (wt.), showing a 1st order exponential decay behavior, decreasing as the temperature increases. The measure liq.. View more»
  

  DOI: 10.35248/2247-2452.22.21.1013

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