Abstract
Grafting of poly( N-vinylcaprolactam) side chains onto a hydrophilic dextran backbone was found to provide the dextran with new, thermoresponsive properties in aqueous solutions. Depending on its solution concentration, the resulting dextran derivative could exhibit a temperature-induced phase-transition and critical transition temperature ( T c). Different anions and cations of added salts, including five potassium salts and five alkali-metal chlorides, were observed to influence the T c value of its aqueous solution. Except for potassium iodide, all added salts were found to lower the T c value. The addition of the surfactant, cationic cetyltrimethylammonium bromide or anionic sodium dodecyl sulfate, resulted in an increase of the T c value. With the help of the Coomassie Brilliant Blue dye as a polarity probe, the formation of hydrophobic aggregates above the T c was revealed for this new dextran derivative in aqueous solution.
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