Time evaluation in the process of mechanical fibrillation obtaining cellulose nanofiber (Pinus elliotti)

The objective of this research was to evaluate the different milling times in obtaining the cellulose nanofibers. A suspension concentration of 2.5% by weight cellulose (Pinus elliotti) fibrillated using stone grinder. The suspension was recirculated for a total period of 5 hours, and every hour a sample was taken Samples were frozen with liquid nitrogen at a temperature of -80°C for 24 hours, and then was carried out at ice sublimation for 72 hours . For each sample were carried out the characterization tests: electron microscopy field emission scanning (FEG-SEM), X-ray diffraction (XRD) and thermogravimetry (TG). The nanoscale fibers were obtained in all grinding times, the crystallinity and thermal stability decreased with milling time in relation the cellulose source. (author)