Matches in SemOpenAlex for { <https://semopenalex.org/work/W3019146965> ?p ?o ?g. }
- W3019146965 abstract "This work aimed to design a synthetic route under mild conditions allowing the main chitosan chain to be grafted with β-cyclodextrin (β-CD) and poly(N-isopropyl acrylamide) (PNIPAm), at C2 and C6 positions, respectively. For this reason, the regioselectivity of proposed reactions is an important factor to be considered. β-CD is an oligosaccharide with a cyclic structure capable of forming inclusion complexes with hydrophobic molecules. Grafting β-CD onto the chitosan backbone by reductive N-alkylation at C2 position was carried out. With this purpose, the previous preparation of β-CD monoaldehyde was required. PNIPAm is a thermosensitive polymer with a transition temperature near 33 °C. To regioselectively anchor poly(N-isopropyl acrylamide) chains onto chitosan at C6 position, it was required to attach at the C6 position of chitosan an alkyl group for the subsequent grafting of PNIPAm-N3 by means of copper-catalyzed azide-alkyne cycloaddition click reaction. To guarantee the regioselectivity of the functionalization of chitosan with a C6 terminal alkyne, its oxyalkylation with glycidyl propargyl ether in a solvent composed of LiOH/KOH/urea was used. The structure of all derivatives was confirmed by FT-IR and 1H-NMR spectroscopy." @default.
- W3019146965 created "2020-05-01" @default.
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- W3019146965 date "2020-04-20" @default.
- W3019146965 modified "2023-10-16" @default.
- W3019146965 title "Synthesis of regioselective chitosan copolymers with β-cyclodextrin and poly(N-isopropyl acrylamide)" @default.
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- W3019146965 doi "https://doi.org/10.1007/s10965-020-02076-7" @default.
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