Berlin 2012 – wissenschaftliches Programm
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CPP: Fachverband Chemische Physik und Polymerphysik
CPP 17: Poster: Crystallisation, Nucleation and Self assembly
CPP 17.2: Poster
Dienstag, 27. März 2012, 18:15–20:15, Poster A
Microphase separation in the block copolymer PMMA-PBA synthesized by RAFT — •Stefanie Grünheit1, Katharina Tietz2, Alexander Rahn1, Philipp Vana2, and Konrad Samwer1 — 11.Physikalisches Institut, Georg-August-Universität Göttingen — 2Institut für Physikalische Chemie, Georg-August-Universität Göttingen
Block copolymers are known to separate into microphases with a rich variety of structures as lamellae or gyroids. Hence their phase diagrams are often complex and highly interesting to study. We want to develop a phase diagram for a polymer consisting of a soft (poly(butyl acrylate), PBA) block and a hard (poly(methyl methacrylate), PMMA) block.
Therefore polymers are synthesized by reversible addition-fragmentation chain transfer (RAFT) polymerization with different blocklength ratios as well as different overall chain lengths. Thermal analysis via thermogravimetric analysis (TGA) and dynamical mechanical analysis (DMA) are performed in order to get information about stability as well as glass temperatures and elastic properties. By means of X-ray scattering and atomic force microscopy (AFM) we want to examine the structural properties with regard to microphase separation.
The presence of two glass transitions as well as the observation of patterns in AFM-pictures suggest the occurence of microphase separated regions.
Financial support by the DFG SFB 937 is thankfully acknowledged.