Synthesis of new chitosan derivatives and combination with biodegradable polymer

Abstract

New chitosan derivatives are synthesized by the reductive N-alkylation reaction of chitosan with various aldehydes, such as 2,4-dihydroxybenzaldehyde, cholesteryl 4-formylbenzoate, and N-dehydroabietyl-4-formylbenzamide. The palladium-adsorption ability of the newly synthesized derivatives is found to be as good as that of chitosan. A blend of chitosan and other biodegradable polymers is also found to exhibit palladiumadsorption ability. In comparison to the starting chitosan, the chitosan derivative having dehydroabietyltype side chains exhibited an improved solubility in methanol. The chitosan derivatives are successfully applied as plastic coating materials for electroless plating.

Palladium adsorbing properties of UV-curable chitosan derivatives and surface analysis of chitosan-containing paint

“…UV-exposed, UV-curable chitosan derivative films showed good palladium adsorption behavior at pH 1.1 and 5.3 (Table 3), as good in fact as previously reported chitosan derivatives [10]. At pH 5.3, the amount of palladium adsorbed on the UV-treated films, prepared from the low DS derivatives was as much as that on chitosan film.…”

“…Using a literature method [10], a Pd(II) solution (150 ppm as palladium ion) of pH 5.3 was obtained from PdCl 2 (0.25 g) and 1% aqueous NaCl (1000 ml). A Pd(II) solution of pH 1.1 was obtained from PdCl 2 (0.25 g), H 2 O (990 ml), and concentrated hydrochloric acid (10 ml).…”

Natural Polymers from Biomass Resources as Feedstocks for Thermoplastic Materials

“…Improved solubility in methanol was observed and attributed to hydrophobic side chains that are able to disrupt the hydrogen bonding of the chitosan polymer chains. [176] As observed for modified cellulosics, the introduction of fatty acyl or aromatic acyl residues can break intermolecular hydrogen bonds and change the crystalline structure of chitin or chitosan. This therefore could not only improve the solubility in organic solvents [177] but could also benefit the thermoplastic properties of such derivatives.…”

“…Using different aldehydes, partially deacetylated chitin (DD = 92–98%) was N ‐alkylated to final DS from ≈0.2–0.4. Improved solubility in methanol was observed and attributed to hydrophobic side chains that are able to disrupt the hydrogen bonding of the chitosan polymer chains …”

Modification and Characterization of Chitosan Films Using 3-trimethoxyl Silyl Propylmethacrylate

“…These biopolymers are biorenewable, biodegradable and biofunctional (7)(8)(9). A great deal of research has been done using chitosan in different fields (10)(11)(12)(13)(14)(15). The presence of active groups in chitosan molecules allows easy chemical modification.…”