Dresden 2014 – wissenschaftliches Programm
Bereiche | Tage | Auswahl | Suche | Aktualisierungen | Downloads | Hilfe
CPP: Fachverband Chemische Physik und Polymerphysik
CPP 9: Crystallization, Nucleation and Self Assembly II
CPP 9.7: Vortrag
Montag, 31. März 2014, 17:00–17:15, ZEU 260
In-situ crystal thickening in semi-crystalline diblock copolymer under soft confinement — •Robert Schulze1, Stefan Hölzer2, and Klaus Jandt1 — 1Otto Schott Institute of Materials Research, Friedrich Schiller University Jena, Löbdergraben 32, 07743 Jena, Germany — 2Laboratory of Organic Chemistry and Macromolecular Chemistry (IOMC), Friedrich Schiller University Jena, Humboldtstraße 10, 07743 Jena, Germany
Crystal thickening of soft-confined semi-crystalline diblock copolymers requires a rearrangement of the microdomain structure.
In the current study the crystal thickening and microdomain rearrangement of a polybutadiene-block-poly(ethylene oxide) was investigated in-situ in the bulk and on the surface of thin films by X-ray scattering and in-situ atomic force microscopy, respectively.
Initially, crystallized bulk and thin film samples were annealed at selected temperatures determined by differential scanning calorimetry. In the bulk we found a sigmoidal increase of the lamellar long period during anneaIing. On the thin film surface we observed that the formation of thicker lamellae results from a complex interaction between the melting of some crystalline microdomains and the thickening of the adjacent ones. Further we discovered the growth of crystalline double lamellae that consisted of non-interdigitated extended chains.
The mechanism of crystal thickening can be used to fabricate tunable nanopatterns of amphiphilic semi-crystalline diblock copolymers which are interesting e.g., in the photonics or the biomedical field.