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论文类型：期刊论文

发表时间：2014-12-19

发表刊物：CARBOHYDRATE POLYMERS

收录刊物：SCIE、PubMed、Scopus

卷号：114

页面范围：530-536

ISSN号：0144-8617

关键字：Starch; Tertiary amine polymer; Phase separation; Stimuli-responsive polymers

摘要：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.