Blends of Poly(methacrylate) Block Copolymers with Photoaddressable Segments

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• 作者：Thomas Breiner ; Klaus Kreger ; Rainer Hagen ; Michael Hä ; ckel ; Lothar Kador ; Axel H. E. M&uuml ; ller ; Edward J. Kramer ; Hans-Werner Schmidt
• 刊名：Macromolecules
• 出版年：2007
• 出版时间：March 20, 2007
• 年：2007
• 卷：40
• 期：6
• 页码：2100 - 2108
• 全文大小：496K
• 年卷期：v.40,no.6(March 20, 2007)
• ISSN：1520-5835

文摘

The paper presents the synthesis of azobenzene-functionalized block copolymers based on a poly(methyl methacrylate) (PMMA) segment and an azobenzene-functionalized poly(hydroxyethyl methacrylate)segment, and a basic study of blending these block copolymers with homopolymers is given. Two diblockcopolymers, prepared via different routes, were synthesized by a living anionic polymerization followed by apolymer analogous reaction to attach the azobenzene side groups. Self-assembly of the block copolymers resultedin phase-separated morphologies on the nanometer scale. The photoaddressable azobenzene segments are dispersedin the PMMA matrix and locally confined. Special focus is given to the preparation and characterization of blockcopolymer blends with PMMA homopolymer in order to dilute the phase-separated azobenzene morphology andreduce the optical density while maintaining the confinement. The block copolymer blends were characterizedwith respect to their morphology and initial holographic experiments were performed.