Monodisperse polypyrrole（PPy） composite microspheres and hollow capsules based on the monodisperse core-shell gel template particles were prepared. The core-shell gel particles were obtained by the inward sulfonatio...Monodisperse polypyrrole（PPy） composite microspheres and hollow capsules based on the monodisperse core-shell gel template particles were prepared. The core-shell gel particles were obtained by the inward sulfonation of monodisperse polystyrene particles. The shell thickness and core size were synchronously controlled in the particle radius range. After the polymerization initiated by ammonium per sulfate（APS）, PPy was formed in the sulfonated polystyrene shell. PPy hollow capsules were derived after the polystyrene cores were dissolved: their cavity size and shell thickness were synchronously controlled by using core-shell gel particles with different sulfonation extent. It is interesting that if Fe3+ was adsorbed into the sulfonated polystyrene shell as the initiator, the PPy-shell collapsed into a pile of small particles when the polystyrene core was dissolved.展开更多
通过使聚N 乙烯基异丁酰胺(PNVIBA)大分子单体与苯乙烯在乙醇/水的混合溶剂中进行自由基分散共聚,得到热敏性PNVIBA接枝聚苯乙烯(PNVIBA g PSt)高分子微球。用TEM对微球的形态进行了观察,同时考察了起始PNVIBA大分子单体浓度、苯乙烯... 通过使聚N 乙烯基异丁酰胺(PNVIBA)大分子单体与苯乙烯在乙醇/水的混合溶剂中进行自由基分散共聚,得到热敏性PNVIBA接枝聚苯乙烯(PNVIBA g PSt)高分子微球。用TEM对微球的形态进行了观察,同时考察了起始PNVIBA大分子单体浓度、苯乙烯浓度、引发剂浓度、聚合温度和混合溶剂中水对微球直径的影响。发现在较宽的聚合反应条件下,得到的接枝高分子颗粒均保持球形并具有单分散性,微球的数均直径(D)与反应条件的关系遵循:D=K[PNVIBA]-0.39[St]0.80[I]-0.14;微球直径随聚合温度的升高和混合溶剂中水含量增加而降低;颗粒形态可以通过改变聚合反应条件或添加第二小分子单体加以控制。展开更多
文摘Monodisperse polypyrrole（PPy） composite microspheres and hollow capsules based on the monodisperse core-shell gel template particles were prepared. The core-shell gel particles were obtained by the inward sulfonation of monodisperse polystyrene particles. The shell thickness and core size were synchronously controlled in the particle radius range. After the polymerization initiated by ammonium per sulfate（APS）, PPy was formed in the sulfonated polystyrene shell. PPy hollow capsules were derived after the polystyrene cores were dissolved: their cavity size and shell thickness were synchronously controlled by using core-shell gel particles with different sulfonation extent. It is interesting that if Fe3+ was adsorbed into the sulfonated polystyrene shell as the initiator, the PPy-shell collapsed into a pile of small particles when the polystyrene core was dissolved.
文摘 通过使聚N 乙烯基异丁酰胺(PNVIBA)大分子单体与苯乙烯在乙醇/水的混合溶剂中进行自由基分散共聚,得到热敏性PNVIBA接枝聚苯乙烯(PNVIBA g PSt)高分子微球。用TEM对微球的形态进行了观察,同时考察了起始PNVIBA大分子单体浓度、苯乙烯浓度、引发剂浓度、聚合温度和混合溶剂中水对微球直径的影响。发现在较宽的聚合反应条件下,得到的接枝高分子颗粒均保持球形并具有单分散性,微球的数均直径(D)与反应条件的关系遵循:D=K[PNVIBA]-0.39[St]0.80[I]-0.14;微球直径随聚合温度的升高和混合溶剂中水含量增加而降低;颗粒形态可以通过改变聚合反应条件或添加第二小分子单体加以控制。
