Regensburg 2013 – wissenschaftliches Programm

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CPP: Fachverband Chemische Physik und Polymerphysik

CPP 19: Poster: Crystallization, Nucleation and Self Assembly

CPP 19.7: Poster

Dienstag, 12. März 2013, 18:15–20:15, Poster C

Crystalline microstructure of thin elastomeric polypropylene films — •Julia Seemann, Martin Neumann, and Robert Magerle — Chemische Physik, TU Chemnitz, D-09107 Chemnitz

Elastomeric polypropylene (ePP) is a semi-crystalline polymer with a low degree of crystallinity of < 20%. We study with atomic force microscopy (AFM) the crystalline microstructures forming in thin films of ePP crystallised from solution or melt. One objective is to find ideal conditions for the formation of the crosshatch structure. The films were prepared on silicon substrates via spin coating or dip coating and were annealed under inert conditions for a few hours up to 4 weeks at temperatures between 90°C and 150°C. With dip coating, gradient films have been prepared, showing a continuous increase in film thickness over the lateral extent. This allows for correlation of the film thickness with the crystalline microstructure. With increasing film thickness the size of hedrites decreases and their number increases. The degree of crystallinity depends on the annealing temperature and time, which is in line with general trends reported in the literature.