pH/温度双敏感淀粉衍生物的制备及其性能研究

he Preparation and Characterization of pH/thermo Dual Responsive Starch Derivatives

摘要:

本文以N,N-二正丙或二正丁基-2,3-环氧丙胺为叔胺化试剂，制备了具有pH/温度双敏感性的叔胺基淀粉醚。考察了反应温度、反应时间、溶剂用量催化剂NaOH用量对产品的取代度的影响，优化了反应条件。当脱水葡萄糖残基（AGU）和叔胺化试剂摩尔比为1：1时，较佳反应条件为：反应温度90℃，n（NaOH）: n（AGU）为0.5，m（H2O）: m（AGU）为4，反应时间12h，取代度为0.59。水溶液的透光率随pH和温度变化测试结果表明，该类叔胺基淀粉醚具有优异的pH/温度双敏感性能，且其浊点温度随着pH值的提高以及烷基碳链的变长而降低。浊点可以在14.9-77.7oC之间精细调控。

Abstract:

In this work, pH/thermo dual responsive tertiary amine starch ether was prepared using N,N-di-n-propyl/butyl-2,3-epoxylpropylamind as tertiary ammoniation reagent. Influences of the reaction conditions to the molecular degree of substitution of the product (MS) were investigated, which including reaction temperature, reaction time, quantity of solvent and catalyst NaOH. As the ratio of AGU to tertiary ammoniation reagent was 1:1, MS could be 0.59, under the optimum condition, at that time, the reaction condition was temperature 90oC, n(NaOH):n(AGU)=0.5, m(H2O):m(AGU)=4, reaction time12h. The result of transmittance of the aqueous solution on different pH showed that this kind of tertiary amine starch has excellent pH/thermo dual responsive property. The cloud points(TC) decreased with the increasing of pH or the length of the carbon chains of alkyl group, which could be adjusted critically in the range of 14.9-77.7oC.