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首页> 外文会议>5th International Symposium on High-Tech Polymer Materials（HTPM-V）（第五届国际高技术高分子材料学术会议）论文集 >Nano-sized Spherical Polyelectrolyte Brushes: Preparation,Characterization and Potential Applications
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Nano-sized Spherical Polyelectrolyte Brushes: Preparation,Characterization and Potential Applications

机译：纳米球形球形聚电解质刷：制备，表征和潜在应用

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Nano-sized spherical polyelectrolyte brushes were prepared by two novel methods: Thermal-controlled emulsion polymerization and photo-emulsion polymerization. The brush particles consist of a solid polystyrene core and a poly(acrylic acid) (PAA) shell which are covalently attached on the core surface densely by one end.The preparation was divided into three steps: First of all, the core was synthesized by conventional emulsion polymerization initiated by redoxy initiators. Then, the home-made thermo-initiators or photo-initiators were attached to the core surface by controlled emulsion polymerization. Finally, the acrylic acids dissolved in water were polymerized under controlled heating or UV radiation, and the PAA brush shell was grown in-situ on the core surface. Dynamic light scattering (DLS) was employed to determine the size of the brushes and to monitor the brush growing during the preparation. The structure of brushes was observed by Atomic Force Microscopy (AFM) and Transmission Electronic Microscopy (TEM). The size of the spherical polyelectrolyte brushes was tunable by controlling pH and salt concentration in the solution while the pH and salt concentration inside the brush less changed due to the intensified Donnen effect of PAA brushes. The thickness of brushes can be modulated by the amount of acrylic acid, and the grafting density of PAA on the core surface is tunable by the amount of themo-initiators or photo-initiators. These nano-sized spherical polyelectrolyte brushes should be ideal candidates for removal of harmful heavy metal ions in waste water, recovery of precious metals in dilute aqueous solutions, and carriers for proteins, diagnostic groups or nano-sized metal catalysts.
机译：通过两种新颖的方法制备了纳米级球形聚电解质刷：热控乳液聚合和光乳液聚合。刷子颗粒由一个固态的聚苯乙烯核和一个聚（丙烯酸）（PAA）壳组成，它们的一端紧密地共价地附着在核表面上。制备过程分为三个步骤：首先，通过以下步骤合成核由氧化还原引发剂引发的常规乳液聚合。然后，通过受控的乳液聚合将自制的热引发剂或光引发剂附接到芯表面。最后，溶解在水中的丙烯酸在受控的加热或UV辐射下聚合，PAA刷壳在芯表面上就地生长。使用动态光散射（DLS）来确定刷子的大小并监视在准备过程中刷子的生长。刷子的结构通过原子力显微镜（AFM）和透射电子显微镜（TEM）观察。球形聚电解质电刷的尺寸可通过控制溶液中的pH和盐浓度来调节，而由于PAA电刷的增强的Donnen效应，电刷内部的pH和盐浓度变化不大。刷子的厚度可以通过丙烯酸的量来调节，并且PAA在芯表面上的接枝密度可以通过热引发剂或光引发剂的量来调节。这些纳米级球形聚电解质电刷应该是去除废水中有害重金属离子，在稀水溶液中回收贵金属以及蛋白质，诊断基团或纳米级金属催化剂的载体的理想选择。

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