Surface characterization by XPS, contact angle measurements and ToF-SIMS of cellulose fibers partially esterified with fatty acids
authors Freire, CSR; Silvestre, AJD; Neto, CP; Gandini, A; Fardim, P; Holmbom, B
nationality International
journal JOURNAL OF COLLOID AND INTERFACE SCIENCE
author keywords cellulose fibers; fatty acids; surface and in-depth esterification; surface characterization; XPS; contact angle; ToF-SIMS
keywords RAY PHOTOELECTRON-SPECTROSCOPY; MECHANICAL PULP FINES; FTIR; ECF
abstract The topochemistry of the controlled heterogeneous esterification of cellulose fibers with fatty acid chlorides of different chain length, both in swelling and non-swelling media, was assessed by X-ray Photoelectron Spectroscopy (XPS), Time-of-Flight Secondary Ion Mass Spectrometry (ToF-SIMS) and contact angle measurements. On the one hand, the results provided by the combined use of these three powerful techniques showed unambiguously the occurrence of the reaction at the fibers' surface and, on the other hand, the XPS results showed that the surface coverage with the fatty acid moieties increased with their chain length, but was only modestly affected by the degree of substitution (DS), suggesting that when the esterification yield was increased (higher DS values), an in-depth reaction also occurred, particularly when DMF was used as a cellulose swelling medium, involving the OH groups buried below the fibers' surface. (c) 2006 Elsevier Inc. All rights reserved.
publisher ACADEMIC PRESS INC ELSEVIER SCIENCE
issn 0021-9797
year published 2006
volume 301
issue 1
beginning page 205
ending page 209
digital object identifier (doi) 10.1016/j.jcis.2006.04.074
web of science category Chemistry, Physical
subject category Chemistry
unique article identifier WOS:000239538300024
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journal impact factor 7.489
5 year journal impact factor 6.171
category normalized journal impact factor percentile 80.818
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