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首页> 外文期刊>ACS Macro Letters >Liquid Metal Nanoparticles as Initiators for Radical Polymerization of Vinyl Monomers
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Liquid Metal Nanoparticles as Initiators for Radical Polymerization of Vinyl Monomers

机译：液态金属纳米颗粒作为用于乙烯基单体的自由基聚合的引发剂

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摘要

Sonication of gallium or gallium-based liquid metals in an aqueous solution of vinyl monomers leads to rapid free radical polymerization (FRP), without the need for conventional molecular initiators. Under ambient conditions, a passivating native oxide separates these metals from solution and renders the metal effectively inert. However, sonication generates liquid metal nanoparticles (LMNPs) of similar to 100 nm diameter and thereby increases the surface area of the metal. The exposed metal initiates polymerization, which proceeds via a FRP mechanism and yields high molecular weight polymers that can form physical gels. Spin trapping EPR reveals the generation of free radicals. Time-of-flight secondary ion mass spectrometry measurements confirm direct polymer bonding to gallium, verifying the formation of surface-anchored polymer grafts. The grafted polymers can modify the interfacial properties, that is, the preference of the metal particles to disperse in aqueous versus organic phases. The polymer can also be degrafted and isolated from the particles using strong acid or base. The concept of physically disrupting passivated metal surfaces offers new routes for surface-initiated polymerization and has implications for surface modification, reduction reactions, and fabrication of mechanically responsive materials.
机译：在乙烯基单体水溶液中的镓或基于镓的液态金属的超声处理导致快速自由基聚合（FRP），而不需要常规分子引发剂。在环境条件下，钝化天然氧化物将这些金属与溶液分离并有效地使金属呈惰性。然而，超声处理产生类似于100nm直径的液态金属纳米颗粒（LMNP），从而增加金属的表面积。暴露的金属引发聚合，其通过FRP机制进行，得到可以形成物理凝胶的高分子量聚合物。旋转诱捕EPR揭示了自由基的产生。飞行时间二次离子质谱测量测量确认直接聚合物结合到镓，验证表面锚固的聚合物移植物的形成。接枝的聚合物可以改变界面性质，即金属颗粒在水性相对于有机相中分散的偏好。聚合物也可以使用强酸或碱从颗粒中加入和分离。物理破坏钝化金属表面的概念为表面引发的聚合提供了新的途径，并且对机械反应材料的表面改性，还原反应和制造具有影响。

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  • 来源
    《ACS Macro Letters》 |2019年第11期|共6页
  • 作者

    Ma Jinwoo; Lin Yiliang; Kim Yong-Woo; Ko Yeongun; Kim Jongbeom; Oh Kyu Hwan; Sun Jeong-Yun; Gorman Christopher B.; Voinov Maxim A.; Smirnov Alex I.; Genzer Jan; Dickey Michael D.;

  • 作者单位

    North Carolina State Univ Dept Chem &

    Biomol Engn Raleigh NC 27695 USA;

    North Carolina State Univ Dept Chem &

    Biomol Engn Raleigh NC 27695 USA;

    Seoul Natl Univ Dept Mat Sci &

    Engn Seoul 151742 South Korea;

    North Carolina State Univ Dept Chem &

    Biomol Engn Raleigh NC 27695 USA;

    Seoul Natl Univ Dept Mat Sci &

    Engn Seoul 151742 South Korea;

    Seoul Natl Univ Dept Mat Sci &

    Engn Seoul 151742 South Korea;

    Seoul Natl Univ Dept Mat Sci &

    Engn Seoul 151742 South Korea;

    North Carolina State Univ Dept Chem Raleigh NC 27695 USA;

    North Carolina State Univ Dept Chem Raleigh NC 27695 USA;

    North Carolina State Univ Dept Chem Raleigh NC 27695 USA;

    North Carolina State Univ Dept Chem &

    Biomol Engn Raleigh NC 27695 USA;

    North Carolina State Univ Dept Chem &

    Biomol Engn Raleigh NC 27695 USA;

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  • 正文语种 eng
  • 中图分类 有机化学;
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