Release Time:2019-03-09  Hits:

Indexed by: Journal Article

Date of Publication: 2014-12-19

Journal: CARBOHYDRATE POLYMERS

Included Journals: Scopus、PubMed、SCIE

Volume: 114

Page Number: 530-536

ISSN: 0144-8617

Key Words: Starch; Tertiary amine polymer; Phase separation; Stimuli-responsive polymers

Abstract: A novel double pH- and temperature-responsive tertiary amine starch ether (TAS) has been developed. Synthesis was performed by grafting dipropyl or dibutyl epoxypropylamine onto hydroxyethyl starch. The cloud point temperatures (T-c) of TAS could be tuned to a wide range from 26 to 72.8 degrees C by changing the alkyl chain length, their average molar substitution (MS), and pH value of the solution. The T-c of TAS increases with decreasing the alkyl chain length, MS, and pH value of the solution. A linear relationship occurs between the T-c and the pH, indicating well-tunable T-c. These TAS also showed single pH-sensitive property due to the existence of tertiary amino and hydrophobic alkyl groups. The synthetic strategy presented here could be employed in the preparation of other novel biomaterials with dual pH- and temperature-responsive properties from a variety of polysaccharides. (C) 2014 Elsevier Ltd. All rights reserved.