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论文类型：期刊论文

发表时间：2013-10-03

发表刊物：JOURNAL OF PHYSICAL CHEMISTRY B

收录刊物：SCIE、EI、PubMed、Scopus

卷号：117

期号：39

页面范围：11830-11835

ISSN号：1520-6106

摘要：Temperature-responsive polymers with a lower critical solution temperature (LCST) have attracted much attention in biomedical and biotechnological fields. It is important to tune their cloud point temperature (T-c) in a broad temperature range as desired by the applications. In this study, new thermo-responsive 2-hydroxy3-isopropoxypropyl starches (HIPS) was synthesized using Hylon V starch as raw material and isopropyl glycidyl ether as hydrophobic reagent. The phase transition behavior of HIPS and their T-c were determined by spectrophotometry. The effects of several conditions on the T-c of the HIPS were also investigated, which indicated that varying the molar substitution (MS) of HIPS can adjust T-c in a broad temperature range from 69 to 28 degrees C by changing the hydrophobic-hydrophilic balance of starch. The phase transition became fast and the T-c decreased with increasing polymer concentration. The effect of a series of sodium salts on the T-c of aqueous HIPS solutions was reported and the effectiveness of ions follows a trend, known as Hofmeister series. Several organic solvents were selected and the organic additives with small molecular weight can also regulate the T-c of HIPS in a certain range by changing the polymer-water interactions.