原子转移自由基聚合
部分
高分子化学
单体
溴化物
自由基聚合
化学
聚合
甲基丙烯酸酯
纳米颗粒
聚合物
自由基引发剂
材料科学
有机化学
纳米技术
作者
Jiucun Chen,Min Hu,Wendong Zhu,Yaping Li
标识
DOI:10.1016/j.apsusc.2011.02.095
摘要
We report on the synthesis of the well-defined structurally silica–nonlinear polymer core–shell nanoparticles via the surface-initiated atom transfer radical polymerization. At first, 3-(2-bromoisobutyramido)propyl(triethoxy)-silane (the ATRP initiator) was prepared by the reaction of 3-aminopropyltriethoxysilane with 2-bromoisobutyryl bromide. The ATRP initiator was covalently attached onto the nanosilica surface. The subsequent ATRP of HEMA from the initiator-attached SiO2 surface was carried out in order to afforded functional nanoparticles bearing a hydroxyl moiety at the chain end, SiO2-g-PHEMA-Br. The esterification reaction of pendent hydroxyl moieties of PHEMA segment with 2-bromoisobutyryl bromide afforded the SiO2-based multifunctional initiator, SiO2-g-PHEMA(-Br)-Br, bearing one bromine moiety on each monomer repeating unit within the PHEMA segment. Finally, the synthesis of SiO2-g-PHEMA(-g-PSt)-b-PSt was accomplished by the ATRP of St monomer using SiO2-g-PHEMA(-Br)-Br as multifunctional initiator. These organic/inorganic hybrid materials have been extensively characterized by FT-IR, XPS, TG, and TEM.
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