Nanosized Organo-Silica Particles with “Built-In” Surface-Initiated Atom Transfer Radical Polymerization Capability as a Platform for Brush Particle Synthesis,ACS Macro Letters

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Nanosized Organo-Silica Particles with “Built-In” Surface-Initiated Atom Transfer Radical Polymerization Capability as a Platform for Brush Particle Synthesis
ACS Macro Letters ( IF 5.1 ) Pub Date : 2020-08-17 , DOI: 10.1021/acsmacrolett.0c00502
Jin Han _{1,

2} , Yue Zhai ₁ , Zongyu Wang ₃ , Markus Bleuel _{4,

5} , Tong Liu ₃ , Rongguan Yin ₃ , Wenjie Wu ₆ , Ilhem F Hakem ₇ , Alamgir Karim ₆ , Krzysztof Matyjaszewski ₃ , Michael R Bockstaller ₁

Affiliation

A facile synthetic method was developed to prepare sub-5 nm organo-silica (oSiO₂) nanoparticles through the self-condensation of atom transfer radical polymerization (ATRP)-initiator-containing silica precursors. The obtained oSiO₂ nanoparticles were characterized by a combination of nuclear magnetic resonance (NMR), thermogravimetric analysis (TGA), transmission electron microscopy (TEM), dynamic light scattering (DLS), and small-angle neutron scattering (SANS). The accessibility of the surface-Br initiating sites was evaluated by the polymerization of poly(methyl methacrylate) (PMMA) ligands from the surface of the oSiO₂ nanoparticles using surface-initiated atom transfer radical polymerization (SI-ATRP). The ultrasmall size, tunable composition, and ease of surface modification may render these organo-silica nanoparticle systems with built-in SI-ATRP capability an interesting alternative to conventional silica nanoparticles for functional material design.

中文翻译：

具有“内置”表面引发原子转移自由基聚合能力的纳米级有机二氧化硅颗粒作为刷状颗粒合成的平台

开发了一种简便的合成方法，通过含有原子转移自由基聚合 (ATRP) 引发剂的二氧化硅前体的自缩合制备亚 5 nm 有机二氧化硅 (oSiO ₂ ) 纳米粒子。所获得的oSiO ₂纳米粒子通过核磁共振(NMR)、热重分析(TGA)、透射电子显微镜(TEM)、动态光散射(DLS)和小角中子散射(SANS)的组合进行表征。通过从 oSiO _{2表面聚合聚（甲基丙烯酸甲酯）（PMMA）配体来评估表面溴引发位点的可及性}使用表面引发的原子转移自由基聚合（SI-ATRP）的纳米粒子。超小尺寸、可调成分和易于表面改性可能使这些具有内置 SI-ATRP 能力的有机二氧化硅纳米粒子系统成为功能材料设计中传统二氧化硅纳米粒子的有趣替代品。

更新日期：2020-09-15

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