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两亲胆固醇壳聚糖碳酸酯的合成及其单分子膜的形成与性能研究
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摘要
本文从壳聚糖结构特点出发,利用甲磺酸保护壳聚糖氨基,在羟基上引入胆固醇合成两亲性胆固醇壳聚糖碳酸酯(ACCC),利用FT-IR和~(13)C-NMR方法证明碳酸酯基的生成。采用Langmuir膜技术跟踪探究不同取代度ACCC的单分子膜在空气/水界面上的形成过程及膜性能,由表面压-单分子层表观面积(π-A)等温曲线得知,从气相到固相变化过程中两亲壳聚糖衍生物单分子经历从分散到集中,在空气/水界面上逐渐形成单分子膜,单分子膜稳定性和强度取决于胆固醇取代度的变化。取代度分别是2.6和3.9的ACCC的膜平均极限面积(A*)达到346.76和652.65cm~2,相应塌陷压值分别等于46.13和47.48mN/m,表明这两种胆固醇壳聚糖碳酸酯Langmuir膜具有良好的性能和稳定性。通过Langmuir-Blogett技术将单分子膜转移制备多层膜修饰的ITO电极。
        
引文
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