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http://cimav.repositorioinstitucional.mx/jspui/handle/1004/847| Synthesis and characterization of chitosan composites reinforced with carbon nanostructures | |
| OMAR VELAZQUEZ MERAZ | |
| JOSE MARTIN HERRERA RAMIREZ FRANCISCO ROBLES HERNANDEZ | |
| Acceso Abierto | |
| Sin Derechos Reservados | |
| Síntesis y caracterización de compósitos de quitosano | |
| Chitosan is a biopolymer synthesized by the deacetylation of chitin, a natural-occurring polymer found in the exoskeleton of crustaceans. It is known that mechanical properties of biopolymers can be improved by addition of small amount of a reinforcer and an appropriate synthesis technique that allows to homogenously distribute the reinforcer inside the biopolymer matrix. This work proposes a synthesis based on a thermomechanical process to incorporate carbon nanostructures (CNS) into the chitosan. Chitosan-CNS composites has been synthetized by mechanical milling and conventional sintering. Thermal degradation of chitosan was studied using thermogravimetric analysis (TGA) carried out in an air atmosphere to found optimal sintering temperatures and prevent chitosan degradation. Raw material and prepared composites were characterized using Fourier transform infrared spectroscopy (FTIR), X-Ray diffraction (XRD) and Raman spectroscopy. The morphology and microstructure of the chitosan-CNS composites were characterized by scanning electron microscopy (SEM), bright field transmission electron microcopy (TEM) and optical microscopy (MO). Mechanical properties such as micro and nanohardness as well as elastic modulus were evaluated using Vickers microhardness and nanoindentation tests. It was demonstrated that the addition of 5 wt% of CNS and sintering at 180 °C for 3 h enhanced the mechanical properties including elastic modulus, micro and nanohardness, which is attributed to the improved cohesion among chitosan and CNS as well as the grain structure refinement due to the mechanical milling. | |
| 2017-02 | |
| Tesis de maestría | |
| Español | |
| OTRAS | |
| Versión publicada | |
| publishedVersion - Versión publicada | |
| Aparece en las colecciones: | Maestría en Ciencia de Materiales |
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| Omar Velázquez Meráz MCM.pdf | 3.97 MB | Adobe PDF | Visualizar/Abrir |