Morphological transition of triblock copolymer cylindrical micelles responding to solvent change
Morphological transition of triblock copolymer cylindrical micelles responding to solvent change
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DOI：
10.1039/c2sm07020k
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发表时间：
2012-01
期刊：
影响因子：
3.4
通讯作者：
Dehui Han;Xiaoyu Li;Song Hong;H. Jinnai;Guojun Liu
中科院分区：
文献类型：
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作者：
Dehui Han;Xiaoyu Li;Song Hong;H. Jinnai;Guojun Liu
报道了BCA三嵌段共聚物在溶剂化介质从对B和A具有选择性的介质改变为仅对A具有选择性的介质后胶束的形态转变。这里，B、C和A分别表示聚（丙烯酸叔丁酯）、聚（甲基丙烯酸2-肉桂酰氧基乙酯）和含胺的聚（甲基丙烯酸N，N-二甲基氨基乙酯）嵌段。在甲醇中，BCA形成以不溶性C嵌段为核心，可溶性A和B嵌段为冠的圆柱形胶束。加入水降低了B冠链的溶解度。随后使用透射电子显微镜（TEM）通过分析样品，这是采取在不同的时间后，水加入到水的体积分数（fw）分别为2.7%和10.7%的胶束形态演变。还报道了在甲醇/水混合物中形成的胶束的稳定形态，fw范围为2.9%至23%。
Reported is the morphological transition of micelles of a BCA triblock copolymer after the solvation medium was changed from one that was selective for B and A to one that was selective for A only. Here B, C, and A denote poly(tert-butyl acrylate), poly(2-cinnamoyloxyethyl methacrylate), and the amine-bearing poly(N,N-dimethylaminoethyl methacrylate) blocks respectively. In methanol, BCA formed cylindrical micelles with the insoluble C block as the core and the soluble A and B blocks as the corona. Adding water reduced the solubility of the B coronal chains. The micellar morphological evolution was followed using transmission electron microscopy (TEM) by analyzing samples, which were taken at different times after water addition to the water volume fractions (fw) of 2.7% and 10.7%, respectively. Also reported are the stabilized morphologies of the micelles formed in methanol/water mixtures with fw ranging from 2.9% to 23%.