改性高直链超顺磁性淀粉的制备及其结构研究

Synthesis and Formation of Superparamagnetic High Amylose Starch

采用氧化法制备超顺磁性高直链交联淀粉及高直链交联羧甲基淀粉,通过X-衍射、扫描电镜、 古埃磁天平分析;结果表明,氧化法生成的磁性离子体达到纳米级(11.16nm～31.26nm),在淀粉中分布比较 均匀,经交联羧甲基化改性后制备的磁性淀粉中磁性粒子磁化率相比交联改性制备的磁性淀粉中的磁性粒子 提高3倍～4倍。

Cross-linked high amylose starch and carboxyl-methylic cross-linked high amylose starch with superparamagnetic properties were synthesized via formation of iron oxides inside a polymer matrix. X-ray diffraction, scan electron microscopy (SEM) and magnetic scale were recorded for characterization of the magnetic phase. The results show: The samples exhibit superparamagnetic properties due to the presence of ferrimagnetic nanoparticles (11.16-31.26nm), equably distributed in the starch matrix. The magnetic ratio of carboxyl-methylic cross-linked high amylose magnetic starch increases 4-5 times against that of the cross-linked high amylose magnetic starch.