摘要
以木薯淀粉(St)和自制纳米表面改性Fe3O4(M)微粒为主要原料,采用反相乳液聚合法制备了磁性木薯淀粉微球(MSt),并通过红外光谱(FT-IR)、X射线衍射(XRD)、透射电镜(TEM)、同步热分析(TG-DSC)和振动样品磁强计(VSM)等手段对磁性木薯淀粉微球进行结构性能分析和反应机理探讨。结果表明,FT-IR分析显示磁性微粒Fe3O4与淀粉成功发生交联反应;TEM和XRD分析显示微球具有以Fe3O4为核淀粉为壳的核壳结构;TG-DSC分析表明微球的热稳定性相比原淀粉略有降低;微球的饱和磁化强度为7.07emu/g,磁化率为3.005×10-6emu/Oe,微球具有磁响应性和超顺磁性。该微球反应历程符合自由基聚合机理。
The magnetic cassava starch microspheres （MSt） were prepared by inverse emulsion with cassava starch （St） and nanometer surface-modified magnetite as raw materials. The structure of MSt were characterization with FTIR, XRD, SEM, TEM, TG-DSC and VSM. Meanwhile, the reaction mechanism in the inverse emulsion was discussed. The results showed that nanometer magnetite were successfully embedded into starch shell. The rnicrospheres possessed core- shell structure. The thermal stability of MSt was a little lower than that of St by TG-DSC analysis. MSt had magnetic response and superparamagnetism, which its saturation magnetization strength and magnetic susceptibility were 7.07 emu/g and 3. 005×10^6 emu/Oe, respectively. The reaction mechanism was in agreement with radical polymerization.
出处
《化工新型材料》
CAS
CSCD
北大核心
2014年第9期158-160,164,共4页
New Chemical Materials
基金
广西自然科学基金项目(2011GXNSFB018018)
广西自然科学基金重点项目(2011GXNSFD018013)
广西石化资源加工及过程强化技术重点实验室主任课题基金资助(2012Z09)
广西高校人才小高地建设创新团队资助计划项目(桂教人201147-12)
广西教育厅科研基金(201103YB012)
关键词
木薯淀粉
磁性微球
反相乳液
表征
机理
cassava starch, magnetism microsphere, inverse emulsion, characterization, mechanism
