Green Nondegrading Approach to Alkyne-Functionalized Cellulose Fibers and Biohybrids Thereof: Synthesis and Mapping of the Derivatization

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• 作者：Gino Mangiante ; Pierre Alcouffe ; B茅atrice Burdin ; Marianne Gaborieau ; Elisa Zeno ; Michel Petit-Conil ; Julien Bernard ; Aur茅lia Charlot ; Etienne Fleury
• 刊名：Biomacromolecules
• 出版年：2013
• 出版时间：January 14, 2013
• 年：2013
• 卷：14
• 期：1
• 页码：254-263
• 全文大小：520K
• 年卷期：v.14,no.1(January 14, 2013)
• ISSN：1526-4602

文摘

Alkyne-functionalized cellulose fibers have been generated through etherification under basic water or hydroalcoholic conditions (NaOH/H₂O/isopropanol). For a given NaOH content, the medium of reaction and, more particularly, the water/IPA ratio, were shown to be of crucial importance to derivatize the fibers without altering their integrity and their crystalline nature. It was shown that the degree of substitution (DS) of the fibers increases concomitantly with isopropanol weight ratio and that, contrary to water or water-rich conditions, derivatization of fibers under isopropanol-rich conditions induces an alteration of the fibers. Optimization of etherification conditions in aqueous media afforded functionalized cellulose materials with DS up to 0.20. Raman confocal microscopy on derivatized fibers cross sections stressed that alkyne moieties are incorporated all over the fibers. The resulting fibers were postfunctionalized by molecular probes and macromolecules in aqueous or water-rich conditions. The effectiveness of the grafting was strongly impacted by the nature of the coupling agents.