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Dresden 2014 – scientific programme

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CPP: Fachverband Chemische Physik und Polymerphysik

CPP 9: Crystallization, Nucleation and Self Assembly II

CPP 9.7: Talk

Monday, March 31, 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 Jandt11Otto 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.

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