Chemical valorization of forest and agricultural by-products. Obtention, chemical characteristics, and mechanical behavior of a novel family of hydrophobic films.
Esterification of hemicelluloses of the xylan family was performed in order to produce hydrophobic films. Acylation reactions were carried out with lauroyl chloride in the N,N-dimethylacetamide/lithium chloride homogeneous system using 4-dimethylaminopyridine as activator and were induced by microwave irradiation. In the experimental conditions used, 108 and 172% mass ratios were obtained for the dodecyl-grafted xylan and heteroxylan, respectively. The degrees of substitution (DS) were 1.3 (maximum 2) for xylan and 1.2 (maximum 2.1) for heteroxylan. These products were further characterized by FT-IR spectroscopy. The mechanical and thermomechanical behavior of this new family of hydrophobic films were analyzed and compared to those obtained from cellulose with a similar DS by the means of tensile tests. Our results indicate that the dodecyl-grafted xylan film presents the best rigidity-resistance to traction ratio.
Faculté des Sciences et Techniques, Laboratoire de Chimie des Substances Naturelles, Limoges Cedex, France.
Charlotte
C
Moine
Vincent
V
Gloaguen
Jean-Michel
JM
Gloaguen
Robert
R
Granet
Pierre
P
Krausz
D000383:Agriculture; D001673:Biodegradation, Environmental; D010969:Plastics; D011134:Polysaccharides / Q000737:chemistry* / Q000378:metabolism; D012995:Solubility; D013696:Temperature; D014197:Trees; D014990:Xylans / Q000737:chemistry* / Q000378:metabolism
D010969:Plastics; D011134:Polysaccharides; D014990:Xylans; C007916:hemicellulose