Controlled heterogeneous modification of cellulose fibers with fatty acids: Effect of reaction conditions on the extent of esterification and fiber properties

The controlled heterogeneous partial modification of cellulose fibers with fatty acids, partially preserving the fiber structure, was investigated. The effect of reaction conditions, such as reaction time, fatty acid chain length, and solvent types (swelling and non swelling), on the extent of ester...

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Bibliographic Details
Published in:Journal of applied polymer science 2006-04, Vol.100 (2), p.1093-1102
Main Authors: Freire, C. S. R., Silvestre, A. J. D., Neto, C. Pascoal, Belgacem, M. N., Gandini, A.
Format: Article
Language:English
Subjects:
Applied sciences
cellulose fibers
Chemical Sciences
composites
crystallinity
esterification
Exact sciences and technology
fatty acids
Fibers and threads
Forms of application and semi-finished materials
Organic chemistry
Polymer industry, paints, wood
surface energy
Technology of polymers
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Summary:The controlled heterogeneous partial modification of cellulose fibers with fatty acids, partially preserving the fiber structure, was investigated. The effect of reaction conditions, such as reaction time, fatty acid chain length, and solvent types (swelling and non swelling), on the extent of esterification and fiber properties was evaluated by elemental analysis, IR‐ATR, X‐ray diffraction, 13C CPMAS NMR, contact angle measurement, thermogravimetry, and scanning electron microscopy. The degree of substitution (DS) increased with reaction time and with the swelling effect of the reaction medium and decreased with the fatty acids chain length. Higher the DS, higher is the decrystallization of cellulose as a result of the heterogeneous esterification reaction. The esterification with fatty acids enhanced the hydrophobic character of the fibers, but decreased their thermal stability. These properties are not strongly affected by the DS in the range investigated, viz. up to 1.4. © 2006 Wiley Periodicals, Inc. J Appl Polym Sci 100: 1093–1102, 2006
ISSN:0021-8995
1097-4628
DOI:10.1002/app.23454