Ionic conductivity and tensile properties of hydroxyethyl and hydroxypropyl chitosan membranes
Ionic conductivity and tensile properties of hydroxyethyl and hydroxypropyl chitosan membranes
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DOI：
10.1002/polb.20007
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发表时间：
2004-04
期刊：
影响因子：
--
通讯作者：
Ying Wan;K. Creber;B. Peppley;V. Bui
中科院分区：
文献类型：
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作者：
Ying Wan;K. Creber;B. Peppley;V. Bui
以壳聚糖为原料，分别与氯乙醇和环氧丙烷反应制备了羟乙基壳聚糖和羟丙基壳聚糖。用傅里叶变换红外光谱和13 C核磁共振谱研究了壳聚糖单元上的取代。通过对改性壳聚糖与未改性壳聚糖的峰面积比较和1HNMR谱峰面积的积分，发现两种改性壳聚糖的最大取代度均小于25%。研究了改性壳聚糖膜的离子电导率和力学性能。与未改性的壳聚糖膜相比，高取代度的羟乙基和羟丙基壳聚糖膜的离子电导率提高了约一个数量级，结晶度显著降低，溶胀指数显著增加。然而，这些改性的膜没有表现出显着的变化，其拉伸强度和断裂伸长率。
Hydroxyethyl chitosan and hydroxypropyl chitosan were prepared through the reaction of alkali-chitosan with 2-chloroethanol and propylene epoxide, respectively. Fourier transform infrared and 13 C NMR measurements were made to examine the substitution on the chitosan unit. According to a comparison of the peak areas between the modified chitosan and unmodified chitosan and the integration of peak areas of 1 H NMR spectra, for both modified chitosans, the maximum degree of substitution was less than 25%. The ionic conductivity and mechanical properties of modified chitosan membranes were investigated. In comparison with the unmodified chitosan membrane, hydrated hydroxyethyl and hydroxypropyl chitosan membranes with a higher degree of substitution showed an increase in ionic conductivity of about one order of magnitude; moreover, the crystallinity of hydroxyethyl and hydroxypropyl chitosan membranes was remarkably reduced, and their swelling indices increased significantly. However, these modified membranes did not exhibit significant changes in their tensile strength and breaking elongation.