Eventos Anais de eventos
COBEM 2017
24th ABCM International Congress of Mechanical Engineering
Non-isothermal kinetics of the thermal degradation of hemicellulose extracted from curauá fibers by alkali treatment
Submission Author:
Vilson Dalla Libera Junior , GO
Co-Authors:
Mariana Roldi de Oliveira, Sandra Luz, Vilson Dalla Libera Junior
Presenter: Vilson Dalla Libera Junior
doi://10.26678/ABCM.COBEM2017.COB17-2110
Abstract
The biodegradability of plant fibers and their intrinsic characteristics contribute to a sustainability of the environment, especially when we used to produce new materials. Natural fibers are constituted by microfibrils cellulose rolled and joined by lignin and hemicellulose. Hemicelluloses can be extracted from natural fibers and as a biodegradable polymer, it can be employed for manufacturing biofuel, edible bio-surfactant, food additives, and biomedicine. Learning more about the thermal properties of this polymer, the main objective of this work is to determine the reaction kinetics for hemicellulose sheets obtained from curauá fibers through thermogravimetric analysis (TG) and its derivative (DTG). This characterization is necessary to define processing conditions and temperature application limitations. The hemicellulose was extracted from curauá through an alkaline solution of KOH and the sheets prepared using water casting process. The behavior of its thermal degradation was investigated from room temperature up to 600°C under nitrogen flow, using heating rates of 10, 15, 20, 40 and 60°C/ min. The hemicellulose sheet activation energy was determined by reaction kinetics equations for each heating rate. The velocity of 15°C/ min was the rate that presented the lowest hemicellulose activation energy.
Keywords
hemicellulose sheet, curauá fibers, Kinetics, activation energy, Thermal Analysis
