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首页> 外文期刊>Polymers for advanced technologies >Synthesis and characterization of silica-polyvinyl imidazole core-shell nanoparticles via combination of RAFT polymerization and grafting-to method
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Synthesis and characterization of silica-polyvinyl imidazole core-shell nanoparticles via combination of RAFT polymerization and grafting-to method

机译：通过筏 - 聚合和嫁接法组合的合成与表征二氧化硅 - 聚乙烯咪唑核 - 壳纳米粒子

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The silica-polyvinyl imidazole core-shell nanoparticles (silica/PVI NPs) with controlled shell thickness and narrow distribution size were fabricated via grafting-to method. First, O-ethyl xanthate terminated PVI with various chain lengths was produced via the reversible addition-fragmentation chain transfer (RAFT) polymerization using O-ethyl-S-phenyl dithiocarbonate (EPDC) as RAFT agent. Next, three synthesized PVI of different molecular weights (3.4, 6.6, and 11kg/mol) were successfully grafted to the methacrylate modified silica NPs from solution by radical mediated grafting-to method. These core-shell NPs were then characterized by Fourier transform infrared spectroscopy (FTIR), X-ray photoelectron spectrum measurements (XPS), transmission electron microscopy (TEM), and thermogravimetric analysis (TGA). Polyvinyl imidazole molecular weight, reaction time, polymer concentration, and reaction temperature were all used to control the grafting reaction for PVI grafting densities and shell thicknesses. The highest grafting density obtained was close to 1.2 chains/nm(2) and was achieved for 3.4kg/mol PVI at 80 degrees C. The prepared silica/PVINP displayed efficient antifouling properties and stability in concentrated sodium chloride aqueous solutions over a broad pH range for a period of at least 7days. Copyright (c) 2017 John Wiley & Sons, Ltd.
机译：通过嫁接至方法制造具有受控壳厚度和窄分布尺寸的二氧化硅 - 聚乙烯咪唑核 - 壳纳米粒子（二氧化硅/ PVI NPS）。首先，通过使用O-乙基-S-苯基二碳酸酯（EPDC）作为筏剂，通过可逆的添加 - 碎片链转移（筏）聚合产生具有各种链长的O-乙基黄原酸封端的PVI。接下来，通过自由基介导的接枝至方法将三种不同分子量（3.4,6.6和11kg / mol）的三种合成的PVI从溶液中成功接枝到甲基丙烯酸酯改性的二氧化硅NPS上。然后通过傅里叶变换红外光谱（FTIR），X射线光电子电子频谱测量（XPS），透射电子显微镜（TEM）和热重分析（TGA）来表征这些核心壳NPS。聚乙烯基咪唑分子量，反应时间，聚合物浓度和反应温度都用于控制PVI接枝密度和壳体厚度的接枝反应。所得到的最高接枝密度接近1.2链/ nm（2），在80℃下达到3.4kg / mol pvi。在宽pH下，制备的二氧化硅/ pvInp在浓氯化钠水溶液中显示出有效的防污性能和稳定性范围至少为7天。版权所有（c）2017 John Wiley＆Sons，Ltd。

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