Thermal, Mechanical and Microstructures Properties of Cellulose Derivatives Films: A Comparative Study |
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Authors: | Norma Espinoza-Herrera Ruth Pedroza-Islas Eduardo San Mart??n-Martinez Alfredo Cruz-Orea Sergio Armando Tom??s |
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Institution: | (1) Facultad de Qu?mica, Universidad Aut?noma del Estado de M?xico, Paseo Colon esq. Paseo Tollocan s/n, 50120 Toluca, Estado de M?xico;(2) Departamento de Ingenier?a y Ciencias Qu?micas, Universidad Iberoamericana, Prolongaci?n Paseo de la Reforma 880, Mexico, CP 01210, DF, Mexico;(3) Centro de Investigaci?n en Ciencia Aplicada y Tecnolog?a Avanzada del Instituto Polit?cnico Nacional, Calzada Legaria 694, Col. Irrigaci?n, CP 11500, DF, Mexico;(4) Departamento de F?sica, Cinvestav-IPN apartado postal 14-740, 07360 Mexico, DF, Mexico; |
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Abstract: | The proposal in this study was to evaluate the physical properties of different biopolymers films. The materials used were:
pectin, carboxyl methylcellulose, methylcellulose, hydroxyl propylcellulose, hydroxypropyl-methylcellulose, and corn waxy
starch; from these polysaccharides aqueous dispersions were prepared to 3% (w/v) for obtained films. In these biopolymer films, the thermal diffusivities (α) was evaluated by the Open Photoacoustic Cell
method; also, their mechanical properties as tensile strength, elongation, and Young’s modulus were measured, their crystallinity
percentage was evaluated by X-ray diffraction and microstructure through atomic force microscopy in contact mode. From the
polysaccharide films, it was observed that most of them were flexible and transparent. In the case of the films, mechanical
properties were found that the highest value of tensile strength and Young’s modulus corresponded to carboxyl methylcellulose
with 69.17 and 1,912.20 MPa values, respectively. Also, Open Photoacoustic Cell method and X-ray diffraction measurements
showed that there exist a correlation between the thermal diffusivity values and the crystallinity measured in the biopolymer
films. It was also observed that α values of cellulose derived was affected by the substitution group in the molecule, reaching
the highest α value, the films of carboxyl methylcellulose. Regarding the microstructural of the films, starch showed the
highest roughness value (88.6 nm) whereas hydroxypropyl-methylcellulose resulted with the lowest roughness value (7.67 nm). |
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