Cellulose nanocrystals from acacia bark-Influence of solvent extraction.
The isolation of cellulose nanocrystals from different lignocellulosic materials has shown increased interest in academic and technological research. These materials have excellent mechanical properties and can be used as nanofillers for polymer composites as well as transparent films for various applications. In this work, cellulose isolation was performed following an environmental friendly procedure without chlorine. Cellulose nanocrystals were isolated from the exhausted acacia bark (after the industrial process of extracting tannin) with the objective of evaluating the effect of the solvent extraction steps on the characteristics of cellulose and cellulose nanocrystals. It was also assessed the effect of acid hydrolysis time on the thermal stability, morphology and size of the nanocrystals, through TGA, TEM and light scattering analyses. It was concluded that the extraction step with solvents was important in the isolation of cellulose, but irrelevant in the isolation of cellulose nanocrystals. Light scattering experiments indicated that 30min of hydrolysis was long enough for the isolation of cellulose nanocrystals.
Chemistry Institute, Federal University of Rio Grande do Sul/UFRGS, 9500 Bento Gonçalves Ave., Porto Alegre, 91501-970, Brazil; Sul-rio-grandense Federal Institute for Education, Science and Technology, 100 Copacabana Ave., Sapucaia do Sul, 93216-120, Brazil. Electronic address: ticitaflick22@gmail.com.
Ticiane
T
Taflick
Chemistry Institute, Federal University of Rio Grande do Sul/UFRGS, 9500 Bento Gonçalves Ave., Porto Alegre, 91501-970, Brazil.
Luana A
LA
Schwendler
Chemistry Institute, Federal University of Rio Grande do Sul/UFRGS, 9500 Bento Gonçalves Ave., Porto Alegre, 91501-970, Brazil.
Simone M L
SML
Rosa
Chemistry Institute, Federal University of Rio Grande do Sul/UFRGS, 9500 Bento Gonçalves Ave., Porto Alegre, 91501-970, Brazil.
Clara I D
CID
Bica
Chemistry Institute, Federal University of Rio Grande do Sul/UFRGS, 9500 Bento Gonçalves Ave., Porto Alegre, 91501-970, Brazil.
Sônia M B
SMB
Nachtigall
D000045:Acacia / Q000737:chemistry*; D002482:Cellulose / Q000737:chemistry* / Q000302:isolation & purification*; D006868:Hydrolysis; D008031:Lignin / Q000737:chemistry; D053758:Nanoparticles / Q000737:chemistry*; D024301:Plant Bark / Q000737:chemistry*; D012997:Solvents / Q000737:chemistry*; D013696:Temperature
D012997:Solvents; C036909:lignocellulose; D002482:Cellulose; D008031:Lignin
Acacia bark; Cellulose nanocrystals; Light scattering; Morphology; Solvent extraction; Thermal properties