Effect of Added Homopolymer on the Hexagonal Phase Formed by Cylindrical Block Copolymer Micelles in a Selective Solvent

✍ Scribed by Sayeed Abbas; Christina D. Cowman; Timothy P. Lodge

• Publisher: John Wiley and Sons
• Year: 2009
• Tongue: English
• Weight: 642 KB
• Volume: 30
• Category: Article
• ISSN: 1022-1336
• DOI: 10.1002/marc.200800599

✦ Synopsis

Abstract

The effect of addition of A homopolymer chains to HEX phases formed by cylindrical micelles obtained by dissolving an AB diblock copolymers in an A selective solvent was investigated. The following general trends were observed: (i) order–order transitions from HEX → Gyroid (G) → Lamellae (LAM); (ii) the inter‐cylinder spacing of the HEX phase increased; (iii) when the homopolymer molecular weight and concentration was high, macrophase separation of the system occurred. The A homopolymer chains do not mix significantly with the A domain of the diblock due to excluded volume interactions, causing the corona chain brush to contract. As a result, order–order transitions that reduce the interfacial curvature are observed.

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