壳聚糖金属配位控制氧化降解及反应动力学研究——(Ⅱ)反应动力学  

METAL-COORDINATING CONTROLLED OXIDATIVE DEGRADATION OF CHITOSAN AND DYNAMICS INVESTIGATION ——(Ⅱ) DYNAMICS INVESTIGATION

作　　者：尹学琼[1] 林强[1] 冯玉红[1] 于文霞[1] 张岐[1] 

机构地区：[1]海南大学化工系,海南海口570228

出　　处：《高分子材料科学与工程》2005年第4期272-275,共4页Polymer Materials Science & Engineering

基　　金：国家自然科学基金资助项目(20061001);海南省自然科学基金资助项目(20304)

摘　　要：将壳聚糖转化为壳聚糖金属配合物,配位键的形成使得壳聚糖分子链上产生有利于分子链断裂的弱势结构。假定配合物中金属离子在壳聚糖高分子链上均匀分布,金属离子与壳聚糖糖元的摩尔比为1∶N,从而将壳聚糖配合物分子看作单体为N个糖元和1个金属离子组成的结合高分子。假定金属离子引入所产生的各弱点性质相同,结合高分子降解应符合无规降解的原理,运用无规降解的动力学方程处理该高分子,其结果吻合性好。对反应速率常数的研究进一步证实壳聚糖铜配合物不仅分子结构有利于壳聚糖降解,其对H2O2分解还存在催化作用,而壳聚糖锰配合物仅在分子结构上有利于壳聚糖降解,不能催化HO分解。Chitosan was converted into chitosan-metal complexes, and then polymer chain of chitosan became more easily to be broken due to coordinating bond between chitosan and metal ion. It is assumed metal ion distributing uniformly on chitosan polymer chain and the molar ratio of metal and chitosan is 1∶N, then chitosan complex can be considered as a new polymer whose monomer is N glucose residues and one metal ion. The new polymer shall degrade on the dynamic regular of random degradation and its degradative result confirmes to the dynamic equation very well. Rate constant of chitosan-metal complex and chitosn expressed chitosan-Cu(Ⅱ) complex has a better molecular structure for degradation than chitosan, and can catalyze H_2O_2 decomposition. But chitosan-Mn(Ⅱ) complex only has a better molecular structure, and can′t catalyze H_2O_2 decomposition.

关 键 词：壳聚糖金属配合物 氧化降解 反应动力学 

分 类 号：O631.1[理学—高分子化学]