核-壳结构PPy/Fe3O4复合粒子的合成及其微观形貌受控机制研究
首发时间:2012-11-29
摘要:在通过一步法合成出PEG/Fe3O4水基磁流体的基础上,利用PEG胶体壳层对引发剂过硫酸铵(APS)及吡咯单体的吸附作用,实现了控制吡咯的聚合反应在PEG/Fe3O4胶体粒子表面进行,得到了粒径分布范围较小的具有核-壳结构的PPy/Fe3O4复合粒子。在此基础上,通过向反应体系中引入乙腈及变化乙腈用量,初步实现了对PPy/Fe3O4复合物的微观形貌的可控,目前可在核-壳结构PPy/Fe3O4复合产物的基础上,进一步制备出了PPy/Fe3O4与PPy两种具有较大粒径差异的颗粒共存的复合物,以及PEG/Fe3O4与PPy两种粒径相当的颗粒共存的复合物。初步提出了基于PEG模板与乙腈胶束两种吡咯聚合场所相竞争的系列PPy/Fe3O4复合物的微观形貌的受控合成机制。
关键词: 聚吡咯 PPy/Fe3O4复合粒子 原位合成 结构 微观形貌 合成机制
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Study on the synthesis of PPy/Fe3O4 composite with core-shell structure and its morphology-controllable mechanism
Abstract:After PEG/Fe3O4 aqueous-based ferrofluid was prepared by a one-step method, the polymerization of pyrrole was controlled to take place on the surface of PEG/Fe3O4 collide particle by the adsorption of ammonium persulfate (APS) and pyrrole monomer in the PEG shell, thus the PPy/Fe3O4 composite particle with core-shell structure and narrow distribution range was in situ synthesized. Moreover, the morphology of the as-prepared PPy/Fe3O4 composite was primarily controlled through adding acetonitrile to the reaction mixture and changing its volume content. By the morphology control method, other two kinds of PPy/Fe3O4 composite respectively with the morphology of coexisting particles of PPy/Fe3O4 and PPy with obvious diameter difference and coexisting particles of PEG/Fe3O4 and PPy in similar diameter scale. Finally, the morphology-controllable polymerization mechanism of PPy/Fe3O4 composite based on the competition between two polymerization sites of PEG template and acetonitrile micelle was primarily proposed.
Keywords: Polypyrrole PPy/Fe3O4 composite particle In-situ synthesis Structure morphology Polymerization mechanism
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核-壳结构PPy/Fe3O4复合粒子的合成及其微观形貌受控机制研究
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