Preparation of highly hydrophobic and lipophobic cellulose fibers by a straightforward gas-solid reaction.
This work describes a very simple, rapid, and efficient approach to the hydrophobization and lipophobization of cellulose fibers through their reaction with gaseous trichloromethylsilane (TCMS). The characterization of the modified surface involved FTIR-ATR and solid-state (29)Si NMR spectroscopy, scanning electron microscopy (SEM), and contact angle measurements with different liquids. The modification generated an inorganic coating around the fibers, associated with the construction of a three-dimensional network of Si-O-Si bridges partly bound to the polysaccharide macromolecules. This coating conferred both a high hydrophobicity and a lipophobicity to the samples even when the treatments applied modest TCMS quantities and reaction times as short as 30 s. The green connotation of this novel process constitutes an additional positive feature.
CICECO and Department of Chemistry, University of Aveiro, Aveiro, Portugal.
Ana Gisela
AG
Cunha
Carmen
C
Freire
Armando
A
Silvestre
Carlos
C
Pascoal Neto
Alessandro
A
Gandini
M Naceur
MN
Belgacem
Didier
D
Chaussy
Davide
D
Beneventi
D002244:Carbon / Q000737:chemistry*; D002482:Cellulose / Q000737:chemistry*; D005740:Gases / Q000737:chemistry; D057927:Hydrophobic and Hydrophilic Interactions; D010316:Particle Size; D012821:Silanes / Q000737:chemistry*; D012825:Silicon / Q000737:chemistry*; D013499:Surface Properties
D005740:Gases; D012821:Silanes; D002244:Carbon; D002482:Cellulose; C049552:methyltrichlorosilane; D012825:Silicon