Obtenção de sistemas de PCL com subproduto da cultura algodoeira.

Abstract

Studies have been carried out with the aim of creating processes that use renewable raw materials, thus generating products that are not environmentally aggressive, without losing quality or performance. The aim of this work was to obtain poly (ε-caprolactone) (PCL) systems with a by-product of the cotton crop in order to evaluate the influence of cotton liner and nanolinter components on the final properties of the polymer composites. The PCL systems with 1, 3 and 5% of loading were obtained in an extruder and processed in injectors, characterized by lignocellulosic composition, particle size and zeta potential, X-ray diffraction (XRD), thermogravimetry (TG), differential scanning calorimetry (DSC), scanning electron microscopy (SEM), mechanical properties and thermal deflection temperature (HDT). By means of the lignocellulosic characterization, a high cellulose content was observed for the vegetable fiber and, due to the particle size and zeta potential, particles with a mean diameter in the nano range were observed. By DRX, the peaks characteristic of pure PCL, linter and nanocellulose were observed. For PCL / Línter and PCL / Nano systems, no changes were seen in the characteristic peaks of the array. By TG, it was verified that the presence of the load did not influence the thermal behavior of the systems. By DSC, no changes were observed in the crystallinity of the systems with the presence of linter and nanolinter. By SEM photomicrographs, the poor adhesion of the polymer matrix to the linter and the nanolinter was observed. By means of the tensile and flexure tests, it was observed that the systems with linter presented a small increase in the modulus and the resistance. For systems containing nanolinter, the modulus and resistance values ​​were similar to those of the matrix. By means of the impact strength test, it was observed that the loads used decreased the resistance of the composites. An increase in the thermal deflection temperature (HDT) of the systems was seen with the presence of the charges.