Berlin 2005 – scientific programme
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CPP: Chemische Physik und Polymerphysik
CPP 3: SYMPOSIUM: Dynamics of multi-component fluids III
CPP 3.2: Talk
Friday, March 4, 2005, 14:30–14:45, TU C243
Immiscible blends compatibilised by triblock terpolymers - Correlation of molecular architecture of block copolymers with morphology and properties — •Holger Ruckdäschel1, Jan K.W. Sandler1, Axel H.E. Müller2, and Volker Altstädt1 — 1Polymer Engineering, University of Bayreuth, Universitätsstrasse 30, 95447 Bayreuth, Germany — 2Macromolecular Chemistry II, University of Bayreuth, Universitätsstrasse 30, 95447 Bayreuth, Germany
Polymer blends such as poly(2,6-dimethyl-1,4-phenylene ether) (PPE) and poly(styrene-co-acrylonitrile) (SAN) are often immiscible, resulting in a rough and disperse morphology. The incompatibility leads to a reduction of properties such as toughness, due to low interphase strengths. Block copolymers are often used as coupling agents to improve the miscibility of the polymers. Poly(styrene)-block-poly(butadiene)-block-poly(methyl methacrylate) triblock terpolymers (SBM) are particularly useful as a compatibiliser in PPE/SAN blends. The interaction between the components results in the formation of a so-called nanostructured ’raspberry’ morphology. Although the basics of solvent-mediated processing have been investigated, melt processing of such materials is more complicated, due to the number of increasing parameters. The triblock terpolymer concept requires a reproducible and stable morphology, which can only be achieved through a basic understanding and systematic monitoring of the relevant processing and the materials parameters. In this study, the effects of block lengths and concentration of SBM on the resulting morphology have been correlated with the processing behaviour and the micromechanical properties of the blends.