Regensburg 2016 – wissenschaftliches Programm

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CPP: Fachverband Chemische Physik und Polymerphysik

CPP 29: Poster: Crystallization, Nucleation, Self Assembly

CPP 29.5: Poster

Dienstag, 8. März 2016, 18:15–21:00, Poster B2

Co-crystallization and Crystal Thickening in Blends of a Double-Crystalline Diblock Copolymer and Corresponding Homopolymers — •Robert Stößel, Tobias Büttner, and Klaus D. Jandt — Chair of Materials Science (CMS), Otto-Schott-Institute for Materials Research, Friedrich Schiller University Jena, Löbdergraben 32, 07743 Jena, Germany

Size and shape of diblock copolymer (DBCP) nanostructures can be varied by blending with homopolymers and/or crystal thickening. In blends of double-crystalline diblock copolymers and crystalline homopolymers co-crystallization can occur. Targeted co-crystallization together with crystal thickening could further extend the range of double-crystalline DBCP nanostructures which was not investigated so far. The aim of the study was to test the hypothesis that the lamellar long period of a double-crystalline polyethylene-block-poly(ethylene oxide) (PE-b-PEO) can be increased by blending with PE and PEO homopolymers as well as by subsequent crystal thickening. Using differential scanning calorimetry, co-crystallization in blends was evaluated by the presence of a single melting endotherm. X-ray scattering experiments showed that co-crystallization can increase the lamellar long period compared to the native PE-b-PEO. Subsequent, annealing experiments revealed crystal thickening of the co-crystals and a further increase of the lamellar long period. Defined co-crystallization and subsequent crystal thickening of double-crystalline DBCP/homopolymer blends can be used to fabricate tailorable nanopatterns for materials science applications in photonics or the biomedical field.