Chain Mixing and Segregation in B-C and C-D Diblock Copolymer Micelles

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• 作者：Jiwen Hu and Guojun Liu
• 刊名：Macromolecules
• 出版年：2005
• 出版时间：September 20, 2005
• 年：2005
• 卷：38
• 期：19
• 页码：8058 - 8065
• 全文大小：411K
• 年卷期：v.38,no.19(September 20, 2005)
• ISSN：1520-5835

文摘

In a block-selective solvent for the B and D blocks of two diblock copolymers B-C andC-D, both diblocks should form micelles. Normally chains of the different diblocks do not mix significantlyor comicellize for repulsion between the B and D coronal chains. This paper describes the tagging of theC blocks by adenine (A) and thymine (T), a H-bonding nucleic acid pair, to enhance mixing of the differentdiblock chains in a micelle. This enhancement effect has been observed in the premixed micelles preparedby 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 ofdifferent diblocks among the premade or the initially pure B-C and C-D micelles. While the A and Ttagging helped give mixed micelles or micelles consisting of chains of both diblocks, the intrinsic repulsionbetween the B and D chains made them segregate into interesting patterns, including being two-facedand flowerlike in the coronas of the mixed premade micelles. Mixed micelles with surface-segregatedchains may have intriguing applications.