Dresden 2006 – wissenschaftliches Programm
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CPP: Chemische Physik und Polymerphysik
CPP 11: POSTER Disperse Polymer Systems
CPP 11.29: Poster
Dienstag, 28. März 2006, 17:00–19:00, P3
Architectural influence on deformation and fracture properties of S-S/B-S triblock copolymers — •Ulrike Staudinger1,2, Bhabani K. Satapathy1,2, Roland Weidisch1,2, Andreas Janke2, and Konrad Knoll3 — 1Institute of Materials Science and Technology, Friedrich-Schiller-University Jena, Löbdergraben 32, D-07743 Jena, Germany — 2Leibniz-Institut für Polymerforschung Dresden, Hohe Str. 6, 01069 Dresden, Germany — 3BASF-AG, 67056 Ludwigshafen, Germany
The influence of molecular architecture on the deformation and fracture behaviour of triblock copolymers with two PS end blocks and random S/B middle block has been studied and the results have been correlated with their morphology. A triblock copolymer with short PS outer blocks and a S/B ratio of 1:1 in the middle block exhibits a wormlike structure and shows elastomeric behaviour. Increasing the soft phase content in the middle block to a S/B ratio of 1:2 results in an increased interaction parameter and thus to enhanced phase separation. The morphology changes into a lamellae structure leading to a distinct increase in strain, yield stress and Youngs modulus. Increasing the PS outer block content up to 18 wt.-% also leads to lamellar morphology and a change to thermoplastic behaviour could be observed. The fracture toughness was evaluated using essential work of fracture method based on concepts of the Post-Yield Fracture Mechanics. With increasing PS content in the outer blocks the resistance against crack propagation increases. The fracture toughness is strongly increased in case of triblock copolymers with lamellae structure when compared to that of wormlike structure.