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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：采用接枝法制备了壳厚可控、粒径分布窄的二氧化硅-聚乙烯咪唑核壳纳米粒子（SiO2/PVI-NP）。首先，以邻乙基-S-苯基二硫代碳酸酯（EPDC）为RAFT试剂，通过可逆加成-断裂链转移（RAFT）聚合制备了不同链长的邻乙基黄药封端PVI。接下来，通过自由基介导接枝法将三种不同分子量（3.4、6.6和11kg/mol）的合成PVI成功地从溶液中接枝到甲基丙烯酸改性二氧化硅NP上。然后通过傅里叶变换红外光谱（FTIR）、X射线光电子能谱（XPS）、透射电子显微镜（TEM）和热重分析（TGA）对这些核壳NP进行了表征。聚乙烯醇咪唑的分子量、反应时间、聚合物浓度和反应温度均用于控制PVI接枝密度和壳厚度的接枝反应。获得的最高接枝密度接近1.2链/nm（2），并在80℃下达到3.4kg/mol PVI。制备的二氧化硅/PVINP在广泛pH范围内的浓氯化钠水溶液中至少7天显示出有效的防污性能和稳定性。版权所有（c）2017约翰威利父子有限公司。

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