Dresden 2003 – wissenschaftliches Programm
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CPP: Chemische Physik und Polymerphysik
CPP 1: Polymerschmelzen
CPP 1.2: Vortrag
Montag, 24. März 2003, 10:15–10:30, ZEU/160
Influence of the chain microstructure in the mechanical properties of thermoplastic-elastomeric copolymers — •Sabine Hild1, Othmar Marti1, Frank Hollmann2, and Bernhard Rieger2 — 1Experimental Physics, University of Ulm, Albert-Einstein-Allee 11, 89081 Ulm — 2Inorganic Chemistry II, University of Ulm, Albert-Einstein-Allee 11, 89081 Ulm
Typically, thermoplastic elastomeric copolymers consist of two segments: A soft flexible block that forms an easily deformable matrix and a hard block that act as physical cross-links. Some of the most important mechanical properties of this copolymers like high strength and elongation are attributed to the phase separated morphology. Variation of the hard and soft block composition in the polymer chain should influence the phase separated microstructure of such a material that case that mechanical properties of the polymer will be changed. Using a new polymerization technique ethylene-CO-propylene-CO-(ECO-PCO)copolymers can be synthezized that way that they contain similar amount of ECO but with different block length. Diblock or multiblock ECO-PCO copolymers are investigated by NMR, DSC, mechanical testing and Scanning Force Microscopy with regard to the resulting phaseseparated microstructure. The influecence of the size and the distribution of hard domains in the macroscopic properties of this polymers will be shown.