热塑性甲壳素衍生物N,O-苄基壳聚糖的合成及表征  

Synthesis and Characterization of Thermoplastic Chitin Derivative N,O-Benzyl Chitosan

作　　者：董炎明[1] 郭振楚[2] 吴玉松[1] 阮永红[1] 童碧海[2] 赵雅青[1] 王惠武[1] 

机构地区：[1]厦门大学材料科学与工程系,厦门361005 [2]湘潭师范学院化学系,湘潭411001

出　　处：《高等学校化学学报》2003年第12期2330-2332,共3页Chemical Journal of Chinese Universities

基　　金：国家自然科学基金 (批准号 :2 99740 2 3 )资助

摘　　要：Chitin derivatives are difficult to be melten because of their very strong inter-molecular and intra-molecular hydrogen bonds. In this paper, N,O-benzyl chitosan was synthesized by means of phase-transfer method. The total degree of substitution for this derivative was 0 8 as determined with 1H NMR and the degree of substitution on nitrogen was 0 3 as determined with elemental analysis. This is a thermoplastic chitin derivative. Its melting point was 470 K as measured with DSC. A viscous isotropic melt occurred at the temperatures between the melting point and the decomposition temperature(513 K) while N,O-benzyl chitosan was heated on a hot stage. DSC results agreed with the results of microscopy observation. The benzyl group can not form hydrogen bonds. It is also non-polar and has larger volume. These factors weaken the interactions between chitosan chains, and therefore decrease the melting point, which was lower than the decomposition temperature. As a result, N,O-benzyl chitosan was able to melt.Chitin derivatives are difficult to be melten because of their very strong inter-molecular and intra-molecular hydrogen bonds. In this paper, N,O-benzyl chitosan was synthesized by means of phase-transfer method. The total degree of substitution for this derivative was 0 8 as determined with 1H NMR and the degree of substitution on nitrogen was 0 3 as determined with elemental analysis. This is a thermoplastic chitin derivative. Its melting point was 470 K as measured with DSC. A viscous isotropic melt occurred at the temperatures between the melting point and the decomposition temperature(513 K) while N,O-benzyl chitosan was heated on a hot stage. DSC results agreed with the results of microscopy observation. The benzyl group can not form hydrogen bonds. It is also non-polar and has larger volume. These factors weaken the interactions between chitosan chains, and therefore decrease the melting point, which was lower than the decomposition temperature. As a result, N,O-benzyl chitosan was able to melt.

关 键 词：热塑性 甲壳素衍生物 N O-苄基壳聚糖 合成 表征 天然高分子化合物 

分 类 号：O636.1[理学—高分子化学]