Regensburg 2016 – wissenschaftliches Programm

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CPP: Fachverband Chemische Physik und Polymerphysik

CPP 34: Crystallization, Nucleation, Self Assembly I (joint session CPP/DY, organized by CPP)

CPP 34.8: Vortrag

Mittwoch, 9. März 2016, 11:45–12:00, H42

Double-Crystalline Diblock Copolymer Nanostructures by Crystal Thickening — •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

Nanostructures of semi-crystalline diblock copolymers (DBCP) can be tailored by controlled crystal thickening. In double-crystalline DBCP, both blocks have the ability to crystallize and, thus, can be used for crystal thickening which was not investigated so far. The aim of the study was to test the hypothesis that the lamellar long period of a linear double crystalline polyethylene-block-poly(ethylene oxide) (PE-b-PEO) can be increased by stepwise annealing of both crystalline phases. Using differential scanning calorimetry, one-step annealing experiments revealed crystal thickening of both crystalline phases, PE and PEO, separately. X-ray scattering experiments showed that PEO crystal thickening did not affect the PE-b-PEOs morphology while PE crystal thickening increased the lamellar long period. Crystal thickening of both phases together was realized by two-step annealing which further increased the lamellar long period as compared to the sole PE crystal thickening. This observation was attributed to a stretching of PEO-blocks triggered by the initial PE crystal thickening that enabled the formation of thicker PEO crystals compared to the one-step annealing of PEO. The defined crystal thickening of double-crystalline DBCP can be used to fabricate tailorable nanopatterns for materials science applications in photonics or the biomedical field.