Dresden 2011 – wissenschaftliches Programm

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CPP: Fachverband Chemische Physik und Polymerphysik

CPP 40: Polymer Crystallization and Semicrystalline Polymers

CPP 40.6: Vortrag

Donnerstag, 17. März 2011, 12:00–12:15, ZEU 160

Self-assembling in solution of crystalline-amorphous olefin block-copolymers investigated by wide-Q SANS and microscopy — •Aurel Radulescu¹, Günter Goerigk¹, Lewis Fetters², and Dieter Richter³ — ¹Forschungszentrum Jülich GmbH, Jülich Centre for Neutron Science, 85747 Garching, Germany — ²School of Chemical and Biomolecular Engineering, Cornell University, Ithaca, New York 14853-5021, USA — ³Forschungszentrum Jülich GmbH, Institut für Festkörperforschung, 52425 Jülich, Germany

Self-assemblies formed in solution by olefin block-copolymers (OBC) that consist of crystallizable ethylene-octene blocks (hard) with very low co-monomer content and high melting temperature alternating with amorphous ethylene-octene blocks (soft) with high co-monomer content and low glass transition temperature were characterized within a wide temperature range over a wide length scale (between 1nm and 10 μm) by combining optical microscopy with crossed polarizers and pinhole- and mirror-focusing-SANS techniques at the KWS-2 and KWS-3 small- and very-small-angle diffractometers set up at the FRM II reactor in Garching. Complex aggregates revealing multiple size levels and hierarchical structural organization were fully characterized with respect to the morphology and the geometrical and density parameters.