Berlin 2012 – wissenschaftliches Programm
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CPP: Fachverband Chemische Physik und Polymerphysik
CPP 17: Poster: Crystallisation, Nucleation and Self assembly
CPP 17.20: Poster
Dienstag, 27. März 2012, 18:15–20:15, Poster A
Nucleation and growth of large scale ordered structures in highly swollen thin-films of Poly-γ-benzyl-L-glutamate (PBLG) — •Kaiwan Jahanshahi1, Ioan Botiz1,2, and Günter Reiter1,2 — 1Institute of Physics, University of Freiburg — 2Freiburg Research Institute of Advanced Studies (FRIAS)
In the α-helical confirmation, the PBLG molecule exhibits chirality and a huge electrical dipole moment making it capable to form liquid crystal, fibrils and even large scales of ordered structures. The mechanisms governing these structure formations are still poorly understood which motivated our experimental study about PBLG assemblies obtained by solvent annealing of spin coated thin films. By controlling the physical parameters like polymer concentration with respect to the solubility limit (below which no ordered structures can nucleate), and also adding a non-solvent to the system, we can precisely control the nucleation density and the growth rate of large scale ordered structures as well as their shape and size in three dimensions. Consequently we could study the kinetics of growth process of Poly(γ-benzyl-L-glutamate) molecules in such systems and define time dependence of the size of the ordered structures as well as the effect of solvent/non-solvent ratio on the nucleation density of such structures.