Preparation and UCST-type phase behavior of glycopolypeptides in alcoholic solvents?
RSC Advances Pub Date: 2015-12-15 DOI: 10.1039/C5RA24697K
Abstract
Glycopolypeptides with different contents of tetra-O-acetyl-D-(+)-mannopyranoside and tetra-O-hydroxyl-D-(+)-mannopyranoside pendants were prepared via copper-mediated [2 + 3] alkyne-azide 1,3-dipolar cycloaddition. Glycopolypeptides with high contents of tetra-O-acetyl-D-(+)-mannopyranoside (x ≥ 44%) exhibited a reversible UCST-type phase behavior in both methanol and ethanol. FTIR analysis revealed that the mechanism of the UCST-type phase behavior originated from the hydrophobic interaction and H-bonding between the polymers and the H-bonding between the polymer and solvent. Variable-temperature UV-vis analysis revealed that the UCST-type transition temperatures (Tpts) of the resulting glycopolypeptides increased as the polymer concentration or main-chain length increased. Incorporation of proton donating groups (i.e., tetra-O-hydroxyl-D-(+)-mannopyranoside) or increasing the number of carbons of aliphatic alcohols led a decrease of maximal concentration and increase of Tpt.
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Journal Name：RSC Advances
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CAS no.: 89640-58-4
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