Degradação térmica de resíduos de resinas dentárias reticuladas a base de PMMA: Recuperação do MMA / Thermal degradation of cross-linked PMMA-based dental resins scraps: Recovery of MMA

Authors

  • Petterson Felipe Lacerda Santos
  • Haroldo Jorge da Silva Ribeiro
  • Paulo Bisi dos Santos Jr
  • Armando Costa Ferreira
  • Lucas Pinto Bernar
  • Douglas Alberto Rocha de Castro
  • Sergio Duvoisin Jr
  • Marcelo Costa Santos
  • Luiz Eduardo Pizarro Borges
  • Nélio Teixeira Machado

DOI:

https://doi.org/10.34117/bjdv7n7-149

Keywords:

PMMA, Pirólise, Análise de Processo, Recuperação do MMA.

Abstract

Neste trabalho, os resíduos de resina dentária reticulado a base de PMMA, foi submetido a pirólise para recuperar o MMA (Metilmetacrilato). A degradação térmica de resíduos de resinas dentárias à base de PMMA reticulado, foi analisada por termo-gravimetria (TG) e termo-gravimetria derivada (DTG) para orientar as condições de operação em escala piloto. A pirólise foi realizada em um reator de 143L, a 420°C e 1,0 atm. A composição química da reação de produtos líquidos de reação obtidos a 420°C, 40, 60, 80, 100, 110 e 130 minutos determinados por cromatografia gasosa acoplada à espectrometria de massas (GC-MS). O rendimento da fase líquida foi 48.20% (m./m.), enquanto o da fase gasosa foi 40.13% (m./m.). O GC-MS identificou nos produtos líquidos de reação a 420°C e 1,0 atm, ésteres do ácido acrílico e cetonas, mostrando concentrações de MMA (Metilmetacrilato) entre 94.51 e 98.85% (área). As concentrações de MMA (Metilmetacrilato) na fase líquida, entre 40 e 80 minutos, alcançaram purezas acima de 98% (área), diminuindo com o aumento do tempo de reação após 100 minutos, tornando assim possível despolimerizar os resíduos de resinas dentais reticuladas à base de PMMA por pirólise para recuperar o MMA (Metilmetacrilato).

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Published

2021-07-07

How to Cite

Santos, P. F. L., Ribeiro, H. J. da S., dos Santos Jr, P. B., Ferreira, A. C., Bernar, L. P., de Castro, D. A. R., Duvoisin Jr, S., Santos, M. C., Borges, L. E. P., & Machado, N. T. (2021). Degradação térmica de resíduos de resinas dentárias reticuladas a base de PMMA: Recuperação do MMA / Thermal degradation of cross-linked PMMA-based dental resins scraps: Recovery of MMA. Brazilian Journal of Development, 7(7), 67318–67337. https://doi.org/10.34117/bjdv7n7-149

Issue

Section

Original Papers