Curaua and eucalyptus nanofibers films by continuous casting: Mechanical and thermal properties.

Autor: Claro PIC; Graduate Program in Materials Science and Engineering (PPG-CEM), Federal University of São Carlos, São Carlos, SP 13565-905, Brazil. Electronic address: pedrocunhaclaro@ymail.com., Corrêa AC; National Nanotechnology Laboratory for Agribusiness (LNNA), Embrapa Instrumentation, São Carlos, SP, 13560-970, Brazil., de Campos A; National Nanotechnology Laboratory for Agribusiness (LNNA), Embrapa Instrumentation, São Carlos, SP, 13560-970, Brazil., Rodrigues VB; Department of Chemistry, Federal University of Sao Carlos, São Carlos, SP, 13565-905, Brazil., Luchesi BR; Graduate Program in Materials Science and Engineering (PPG-CEM), Federal University of São Carlos, São Carlos, SP 13565-905, Brazil., Silva LE; Forest Science Department Federal University of Lavras, Lavras, MG, P.O. Box 3037, 37200-000, Brazil., Mattoso LHC; National Nanotechnology Laboratory for Agribusiness (LNNA), Embrapa Instrumentation, São Carlos, SP, 13560-970, Brazil., Marconcini JM; National Nanotechnology Laboratory for Agribusiness (LNNA), Embrapa Instrumentation, São Carlos, SP, 13560-970, Brazil.
Jazyk: angličtina
Zdroj: Carbohydrate polymers [Carbohydr Polym] 2018 Feb 01; Vol. 181, pp. 1093-1101. Date of Electronic Publication: 2017 Dec 02.
DOI: 10.1016/j.carbpol.2017.11.037
Abstrakt: A wide variety of new green materials such as curaua leaf fibers (CLFs) has potential applications in nanotechnology. This study aims to investigate the thermomechanical properties and morphological structure of cellulose nanocrystals (CNCs) and cellulose nanofibrils (CNFs) films obtained by continuous casting. The CNCs were obtained by acid hydrolysis and CNFs by mechanical shearing from bleached CLFs and eucalyptus pulp. The morphology after continuous casting resulted in oriented nanofibers, and as a consequence there was mechanical anisotropy. CNCs films showed the greatest values of tensile strength (36±4MPa) and the more effective fibrillation provided better mechanical strength of eucalyptus CNFs films than curaua CNFs films. Sulfur groups and mechanical shear degradation affected the stability of CNCs and CNFs films, respectively. Thus, the type of nanostructure, the way they interact to each other, the cellulose source and the process interfere significantly on the properties of the films.
(Copyright © 2017 Elsevier Ltd. All rights reserved.)
Databáze: MEDLINE
Externí odkaz: