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实验研究了剪切(搅拌)对ABC三嵌段共聚物PS720-b-P2VP200-b-PEO375在溶液中自组装形成的胶束形态的影响,研究结果表明剪切对多节状蠕虫胶束的生成和结构有着重要作用.在1500 r/min剪切速率时,嵌段共聚物自组装形成的球形胶束首先聚集形成蠕虫胶束的梭状轮廓,然后再经过不断地融合与调整形成蠕虫胶束节状部分的盘状结构,同时球的融合趋于沿着垂直于梭状结构的主轴方向(即流场方向).溶剂THF对PS嵌段充分的溶胀使得球形胶束进一步调整形成盘状结构,从而使梭状胶束聚集体顺利地向多节状蠕虫胶束过渡.通过透射电镜(TEM)和扫描电镜(SEM)对胶束形态进行表征,结果表明,多节状蠕虫胶束是剪切作用下球形胶束二次自组装的结果.
The effect of shear (agitation) on the morphology of micelles formed by the self-assembly of ABC triblock copolymer PS720-b-P2VP200-b-PEO375 in solution was investigated experimentally. The results show that shear Generation and structure. At a shear rate of 1500 r / min, the spherical micelles formed by the self-assembly of the block copolymer first aggregate to form a fusiform contour of the worm micelles, and then continue to fuse and adjust to form a worm gum The disc-shaped structure of the nodular structure, while the ball fusion tends to be perpendicular to the spindle structure perpendicular to the spindle direction (ie, the direction of the flow field.) Solvent THF PS block is fully swollen so that spherical micelles further adjusted to form a disc Structure so that the fusiform micelles migrate smoothly to the multi-section worm micelles.The morphology of the micelles was characterized by transmission electron microscopy (TEM) and scanning electron microscopy (SEM). The results showed that the multi-section worm micelles were Self - assembly of spherical micelles under shear.