Banca de DEFESA: EVAL OLIVEIRA MIRANDA JUNIOR

Uma banca de DEFESA de MESTRADO foi cadastrada pelo programa.
DISCENTE : EVAL OLIVEIRA MIRANDA JUNIOR
DATA : 30/11/2020
HORA: 10:00
LOCAL: videoconferência na plataforma RNP (sala PEI-UFBA)
TÍTULO:

MECHANOCHEMICAL PRODUCTION OF UREA AND CITRIC ACID COPOLYMER.

PALAVRAS-CHAVES:

Polymerization, mechanochemistry, green chemistry, acid-based polymer, urea-based polymer.

PÁGINAS: 92
GRANDE ÁREA: Engenharias
ÁREA: Engenharia de Produção
RESUMO:

Polymers are versatile, durable, and widely materials used in modern life. However, petroleum-based polymers have caused concern due to environmental problems like global heating and climatic changes. As a result, the production of polymers not derived from petroleum has been studied to produce compounds that cause less impact on the environment, as well as the search for new strategies of solvent-free polymerization reactions. In this context, this present study is aimed to produce a polymer using biodegradable monomers, urea and citric acid, through mechanochemistry reaction, recognized as an environmentally-friendly methodology. Then, the polymeric material was produced from both solution polymerization, according to parameters that were found in the literature, and mechanochemical reaction. The mechanochemical reaction was carried out using a planetary ball mill, varying the number of spheres and their material with values fixing about time and cycles per minute. The products were characterized by Infrared spectroscopy (FTIR), matrix-assisted laser desorption/ionization (MALDITOF), X-ray diffraction. (XRD), nuclear magnetic resonance (NMR), Thermogravimetric analysis (TGA), Differential scanning calorimeter (DSC), scanning electron microscope (SEM) and its solubility profile and reaction yield. The results confirmed that solvent-free polymeric product was successfully produced with a yield of 82% and low energy costs. The results also showed that mechanochemical route produced polymeric material that is similar to one produced by solution polymerization. The mechanochemical proved to be a viable route for polymeric synthesis with easy control of process variables and low environmental impact.

MEMBROS DA BANCA:
Interno - 3495808 - KAREN VALVERDE PONTES
Externo à Instituição - LUCAS BRITTO LANDIM
Presidente - 1568172 - ROSANA LOPES LIMA FIALHO
Externo ao Programa - 1215450 - SILVIO DO DESTERRO CUNHA