|
|||||
|
|
Preparation and Characterization of Nanocomposites of Carboxymethyl Cellulose Reinforced with Cellulose Nanocrystals |
|
| Authors: | Wilson Pires Flauzino Neto Hudson Alves Silvério Júlia Graciele Vieira Héden da Costa e Silva Alves Daniel Pasquini Rosana Maria Nascimento de Assunção Noélio Oliveira Dantas |
| Affiliation: | 1. Instituto de Química, Universidade Federal de Uberlândia, Campus Santa Mônica, Av. João Naves de Ávila, 2121, Uberlândia - Minas Gerais, Brazil;2. Faculdade de Ciências Integradas do Pontal, Universidade Federal de Uberlândia, Campus Pontal, Rua 20, 1600 CEP 38.304-402, Ituiutaba - Minas Gerais, Brazil;3. Instituto de Física, Universidade Federal de Uberlândia, Av. João Naves de Ávila, n°2121, Uberlândia - Minas Gerais, Brazil |
| Abstract: | Summary: Cellulose nanocrystals (CNC) were extracted from Kraft pulp of Eucalyptus urograndis. The CNC were isolated by acid hydrolysis with H2SO4 64% (w/w) solution, for 20 minutes at 45 °C. The morphology and crystallinity of the CNC were investigated by atomic force microscopy (AFM) and X-ray diffraction (XRD), respectively. The AFM image supports the evidence for the development of crystals of cellulose in nanometric scale. These nanoparticles were used as reinforcement material in carboxymethyl cellulose (CMC) matrix. Nanocomposites films were prepared by casting. The nanocomposites were characterized by thermal (TGA) and mechanical (DMA) analyses. A large reinforcing effect of the filler was observed. The tensile strength of nanocomposites was significantly improved by 107%, the elongation at break decreased by 48% and the thermal resistance increased slightly. The improvements in thermo-mechanical properties suggest a close association between filler and matrix. |
| Keywords: | carboxymethyl cellulose cellulose nanocrystals Eucalyptus urograndis nanocomposites nanoparticles |