Authors Stadermann, J. ; Fleischmann, S. ; Messerschmidt, M. ; Komber, H. ; Voit, B.
Title Multifunctional block copolymers based on styrene derivatives
Date 17.03.2009
Number 17623
Abstract Several functionalized block copolymers based on polystyrene with considerably different block polarities have been prepared using controlled radical polymerization techniques (NMRP, RAFT). The target polymers, having hydroxy, alkyne or amine functionalities in at least one block were characterized by techniques like NMR, GPC and DSC to verify structure, molar masses, molecular weight distributions and thermal properties. With the example of partly protected hydroxystyrene based block copolymers, regular structured film surfaces could be created and were shown to be converted into homogeneous polymer surfaces by applying heat as external trigger. With alkyne functionalized block copolymers, modifications with objects of varying sizes were carried out, employing the 1,3-dipolar cycloaddition of alkynes with azides. Once again, the click approach proved its high efficiency as the reactions proceeded completely even with objects of high steric demand. Studying the influence on the macromolecular architecture, we found a strong alteration of glass transition temperatures for the compared polymer materials, indicating a bracing of the chains due to steric hindrance between the bulky side objects.
Publisher Macromolecular Symposia
Citation Macromolecular Symposia 275-276 (2009) 35-42
Tags block copolymers controlled radical polymerization 1 3-dipolar cycloaddition nmrp raft click chemistry polymer lithography surfaces arrays

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