Chain mixing and segregation in B-C and C-D diblock copolymer micelles
Chain mixing and segregation in B-C and C-D diblock copolymer micelles
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DOI：
10.1021/ma0510082
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发表时间：
2005-09-20
期刊：
影响因子：
5.5
通讯作者：
Liu, GJ
中科院分区：
文献类型：
--
作者：
Hu, JW;Liu, GJ
在两种二嵌段共聚物B-C和C-D的B和D嵌段的嵌段选择性溶剂中，两种二嵌段应形成胶束。通常，不同二嵌段的链不显著混合或共混以在B和D冠状链之间产生排斥。本文描述了腺嘌呤（A）和胸腺嘧啶（T），一个H-键合核酸对的C块的标签，以提高胶束中不同的二嵌段链的混合。在通过首先将两种二嵌段在对所有三种嵌段都有利的溶剂中混合，然后加入对B和D具有嵌段选择性的溶剂而制备的预混胶束中观察到这种增强效应。A和T标记还显示出增强预制或初始纯的B-C和C-D胶束中不同二嵌段的链的混合。虽然A和T标记有助于得到混合胶束或由两种二嵌段的链组成的胶束，但B和D链之间的内在排斥使它们分离成有趣的图案，包括在混合预制胶束的冠状中的双面和花状。具有表面分离链的混合胶束可能具有有趣的应用。
In a block-selective solvent for the B and D blocks of two diblock copolymers B-C and C-D, both diblocks should form micelles. Normally chains of the different diblocks do not mix significantly or comicellize for repulsion between the B and D coronal chains. This paper describes the tagging of the C blocks by adenine (A) and thymine (T), a H-bonding nucleic acid pair, to enhance mixing of the different diblock chains in a micelle. This enhancement effect has been observed in the premixed micelles prepared by first mixing the two diblocks in a solvent good for all of the three blocks and then adding a block-selective solvent for B and D. The A and T tagging has been shown also to enhance mixing of chains of different diblocks among the premade or the initially pure B-C and C-D micelles. While the A and T tagging helped give mixed micelles or micelles consisting of chains of both diblocks, the intrinsic repulsion between the B and D chains made them segregate into interesting patterns, including being two-faced and flowerlike in the coronas of the mixed premade micelles. Mixed micelles with surface-segregated chains may have intriguing applications.