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Publications (7)
In this article ¹H Time Domain Nuclear Magnetic Resonance (TD-NMR) techniques were used to evaluate changes in the microstructure and chain mobility of polyamide 11 (PA11) induced by the exposure to a commercial H2S scavenger. Dipolar based NMR pulse sequence such as ¹H mixed Magic Sandwich Echo (mixed-MSE), ¹H Dipolar Filtered Magic Sandwich Echo...
BACKGROUND
The global concern of plastic pollution in the environment has consistently been emerging in the past years. As one of the main polymers constituting single‐use products, poly(ethylene terephthalate) (PET) is found in a plethora of packages for diverse sectors, and its recycling has been broadly addressed. However, other relevant industr...
The dissemination of technologies for poly(ethylene terephthalate) (PET) recycling is of paramount importance in the context of the plastics circular economy. One of the most promising alternatives is to use enzymes as catalysts for PET depolymerization to its monomers, but this route still needs improvement, especially regarding titer and producti...
PET depolymerization via enzymatic catalysis is one of the most promising technologies in the context of plastics circular economy. So far, hydrolysis reactions accounted for almost the totality of studies, since the glycolysis route was only recently reported. In the present work, a comparative analysis of hydrolysis and glycolysis of PET oligomer...
An asphaltene sample from a Light Arabian crude oil was characterized using several analytical techniques such as TGA, NMR, FTIR and elemental analysis. The results showed that the sample has a high sulfur content, highly condensed aromatic compounds, and the average molecular structure is predominantly of continental/island type, but the presence...
Activated carbons with well-developed microporosity and containing dispersed nanostructured phosphorus compounds were produced by the chemical activation with H3PO4 of an abundant Brazilian lignocellulosic residue (endocarp of babassu coconut). The chemical nature of the phosphorus-containing species in the produced materials was studied by ¹H, ¹³C...
The chemical and physical properties of a Brazilian heavy oil submitted to plasma treatment were investigated by 1H low- and high-field nuclear magnetic resonance (NMR) combined to the characterization of rheological properties, thermogravimetry and measurement of basic sediments and water (BSW) content. The crude oil was treated in a dielectric ba...
