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首页> 外文期刊>Colloid and polymer science >Ionic liquid mediated synthesis of poly(2-hydroxyethyl methacrylate-block-methyl methacrylate)/Fe3O4 core-shell structured nanocomposite by ATRP method
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Ionic liquid mediated synthesis of poly(2-hydroxyethyl methacrylate-block-methyl methacrylate)/Fe3O4 core-shell structured nanocomposite by ATRP method

机译：离子液体介导的ATRP法合成甲基丙烯酸2-羟乙酯-嵌段-甲基丙烯酸甲酯/ Fe3O4核壳结构纳米复合材料

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摘要

A hybrid nanocomposite of magnetic nanoparticles (Fe3O4) and poly(2-hydroxyethyl methacrylate)-block-poly(methyl methacrylate) (PHEMA-b-PMMA) was synthesized successfully by the atom transfer radical polymerization (ATRP) in an ionic liquid (IL), 1-butyl-3-methylimidazolium hexafluorophosphate ([Bmim]PF6). Fe3O4 nanoparticles were first surface-modified with the initiator, 2-bromoisobutyryl bromide (BiBBr), in dimethylformamide (DMF) solvent, which produced the macro-initiator, Fe3O4-BiB, to initiate the polymerization reactions for the synthesis of the block polymer, PHEMA-b-PMMA. After immobilizing the initiator on the surface of Fe3O4, the block polymer chains were grafted successfully onto the Fe3O4 surface, causing the formation of a core-shell nanostructure. The incorporation of Fe3O4 in the nanocomposite was confirmed by attenuated total reflectance-Fourier transform infrared spectroscopy, X-ray diffraction, transmission electron microscopy, thermogravimetric analysis, and X-ray photoelectron spectroscopy. The thermal stability and magnetic properties increased with increasing amount of Fe3O4 in the nanocomposite.
机译：通过在离子液体（IL）中进行原子转移自由基聚合（ATRP）成功地合成了磁性纳米颗粒（Fe3O4）和聚（甲基丙烯酸2-羟乙酯）-嵌段-聚（甲基丙烯酸甲酯）（PHEMA-b-PMMA）的杂化纳米复合材料），1-丁基-3-甲基咪唑鎓六氟磷酸盐（[Bmim] PF6）。首先，在二甲基甲酰胺（DMF）溶剂中用引发剂2-溴异丁酰溴（BiBBr）对Fe3O4纳米颗粒进行表面改性，从而生成大分子引发剂Fe3O4-BiB，以引发聚合反应以合成嵌段聚合物， PHEMA-b-PMMA。将引发剂固定在Fe3O4表面后，嵌段聚合物链成功接枝到Fe3O4表面，形成核-壳纳米结构。通过衰减全反射-傅立叶变换红外光谱，X射线衍射，透射电子显微镜，热重分析和X射线光电子能谱证实了Fe3O4在纳米复合材料中的结合。随着纳米复合材料中Fe3O4含量的增加，热稳定性和磁性能也随之提高。

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