This work studied the effect of copper ions concentration chelated by functional groups in chitosan on its molecular dynamic. Chitosan Copper complexes prepared having different copper concentrations by the electroche...This work studied the effect of copper ions concentration chelated by functional groups in chitosan on its molecular dynamic. Chitosan Copper complexes prepared having different copper concentrations by the electrochemical oxidation technique in aqueous-acetic acid medium. It was carried out at constant voltage (2 volt.) at room temperature at different electro-oxidation time. The result of partial elemental analysis and XRD studies of chitosan copper complexes compared with chitosan confirmed that the percentage composition of the complexes were found to be depend on the time of electrolysis which is in good agreement with our previous work. Interpretation of the effect of copper ions concentration on molecular motion of chitosan studied using dielectric spectroscopy, the results showed that dielectric constant of chitosan is higher than that of chitosan copper complexes. This may be attributed to the relatively fast segmental motion of chitosan chain slowed down by complexation with copper ions of all complex samples. Calculated activation energy from Arrhenius variation showed increase in value with increasing the copper concentration and all in the range that required for ionic conduction. Temperature dependence part of dielectric parameters gives very useful representation in the glass transition temperature determination.展开更多
壳聚糖(chitosan)是从虾、蟹等甲壳动物中提取的一种天然碱性高分子多糖,壳聚糖易与过渡金属及稀土金属配位形成壳聚糖金属配位聚合物[chitosan metal complexes(CMC)],壳聚糖及壳聚糖金属配位聚合物是目前研究广泛的一类新型高分子生...壳聚糖(chitosan)是从虾、蟹等甲壳动物中提取的一种天然碱性高分子多糖,壳聚糖易与过渡金属及稀土金属配位形成壳聚糖金属配位聚合物[chitosan metal complexes(CMC)],壳聚糖及壳聚糖金属配位聚合物是目前研究广泛的一类新型高分子生物材料,近年来的研究表明壳聚糖及壳聚糖金属配位聚合物在木材工业中有着广泛的应用前景,例如作为环保型木材防腐剂,促进木材防腐工业的持续发展。笔者介绍了其基本应用,重点报道其在木材染色、木材保护及用于木质材料胶合方面的应用及研究进展。展开更多
文摘This work studied the effect of copper ions concentration chelated by functional groups in chitosan on its molecular dynamic. Chitosan Copper complexes prepared having different copper concentrations by the electrochemical oxidation technique in aqueous-acetic acid medium. It was carried out at constant voltage (2 volt.) at room temperature at different electro-oxidation time. The result of partial elemental analysis and XRD studies of chitosan copper complexes compared with chitosan confirmed that the percentage composition of the complexes were found to be depend on the time of electrolysis which is in good agreement with our previous work. Interpretation of the effect of copper ions concentration on molecular motion of chitosan studied using dielectric spectroscopy, the results showed that dielectric constant of chitosan is higher than that of chitosan copper complexes. This may be attributed to the relatively fast segmental motion of chitosan chain slowed down by complexation with copper ions of all complex samples. Calculated activation energy from Arrhenius variation showed increase in value with increasing the copper concentration and all in the range that required for ionic conduction. Temperature dependence part of dielectric parameters gives very useful representation in the glass transition temperature determination.
文摘壳聚糖(chitosan)是从虾、蟹等甲壳动物中提取的一种天然碱性高分子多糖,壳聚糖易与过渡金属及稀土金属配位形成壳聚糖金属配位聚合物[chitosan metal complexes(CMC)],壳聚糖及壳聚糖金属配位聚合物是目前研究广泛的一类新型高分子生物材料,近年来的研究表明壳聚糖及壳聚糖金属配位聚合物在木材工业中有着广泛的应用前景,例如作为环保型木材防腐剂,促进木材防腐工业的持续发展。笔者介绍了其基本应用,重点报道其在木材染色、木材保护及用于木质材料胶合方面的应用及研究进展。
