Banca de DEFESA: MARIANA SIMÕES GUALBERTO

Uma banca de DEFESA de MESTRADO foi cadastrada pelo programa.
STUDENT : MARIANA SIMÕES GUALBERTO
DATE: 23/07/2021
TIME: 19:00
LOCAL: meet.google.com/gxu-hzag-tmm
TITLE:

SYNTHESIS AND CHARACTERIZATION OF POLYURETHANE FOAMS FROM A MIXTURE OF RESIDUAL SOYBEAN AND MORINGA POLYOLS

KEY WORDS:

Keywords: residual soybean oil, moringa, vegetable oils, polyol, hydroxylation, polyurethane foams.

PAGES: 108
BIG AREA: Engenharias
AREA: Engenharia Química
SUMMARY:

This work refers to the synthesis of polyols from vegetable oil extracted from moringa seeds and residual soybean oil of 12 and 24 hours of frying, which were used for the production of polyurethane foams from their mixture with previously determined proportions. The oils were functionalized using the peracid hydroxylation in situ methodology. The production of residual soybean polyol differs from the methodology applied to moringa oil in that it is preceded by an esterification stage, which aims to reduce the free fatty acids present in large quantities due to the thermal degradation to which the soybean oil was submitted. The precursor oils and their polyols were evaluated by physicochemical analyses, such as acidity and hydroxyl indices, and by characterization techniques such as Fourier Transform Infrared Spectroscopy (FTIR), Nuclear Magnetic Resonance (NMR), and Mass Spectrometry (MS), which allowed to confirm the conversion of oils into polyols, qualify them and infer properties of the foams later formulated, such as their stiffness/flexibility. It was possible to observe that the frying time is inversely proportional to the unsaturation content identified in the samples and directly proportional to its acidity index. The hydroxylated polyols, when compared to their oils, showed an increase in the content of free fatty acids, in the numbers of hydroxyls and molecular weights. Such changes reflect the functionalization of the oils and the applicability of the polyols for the formation of urethane groups. The Moringa polyol and the residual soybean polyols, 12 and 24 hours of frying presented acidity indexes below 5 mg KOH.g-1 and functionality of 2.5 (12h) and 2.9 (24h) for soybean and 4.9 for the moringa. These results indicate that polyols have potential in the production of flexible and semi-flexible polyurethane foams.

BANKING MEMBERS:
Presidente - 1863340 - EDUARDO PRADO BASTON
Interna - 1861356 - CRISTIANE MEDINA FINZI QUINTAO
Interno - 1759475 - JORGE DAVID ALGUIAR BELLIDO
Externa à Instituição - KÁTIA MONTEIRO NOVACK - UFOP