What is the real value of chitosan's surface energy?
authors Cunha, AG; Fernandes, SCM; Freire, CSR; Silvestre, AJD; Pascoal, C; Gandini, A
nationality International
journal BIOMACROMOLECULES
keywords CHEMICAL-MODIFICATION; POLYMERS; WETTABILITY; CHITIN; FILMS
abstract Because of conflicting reports and unrealistic literature values, a systematic study of the surface energy of chitin, chitosan, and their respective monomeric counterparts was carried out using contact angle measurements on films and pellets, before and after different purification procedures. All the commercial samples of these polymers were shown to contain nonpolar impurities that gave rise to enormous errors in the determination of the polar component of their surface energy. After their thorough removal, the value of the total surface energy (gamma(s)) and particularly of its polar component, increased considerably and reached the classical polysaccharide figures of gamma(d)(s) similar to 30 and gamma(p)(s) similar to 30 mJ/m(2). The characterization of the impurities by gas chromatography/mass spectrometry analysis indicated the presence of significant amounts of higher alkanes, fatty acids, and alcohols and sterols.
publisher AMER CHEMICAL SOC
issn 1525-7797
year published 2008
volume 9
issue 2
beginning page 610
ending page 614
digital object identifier (doi) 10.1021/bm701199g
web of science category Biochemistry & Molecular Biology; Chemistry, Organic; Polymer Science
subject category Biochemistry & Molecular Biology; Chemistry; Polymer Science
unique article identifier WOS:000253102100028
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journal analysis (jcr 2019):
journal impact factor 6.092
5 year journal impact factor 5.775
category normalized journal impact factor percentile 92.195
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