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Morphologieentwicklung unter Dehnbeanspruchung

(Nano-) Komposite und Blends

Ansprechpartner

 

Dr. Ing. Joachim Kaschta

 

Tel.:+49 9131/85-27606

Fax: +49 9131/85-28321

Mail: joachim.kaschta@fau.de

Raum: 1.72

The understanding and control of the blend morphology development in mixing equipments where two or more immiscible polymers are blended is a long-lasting dream of researchers in the field of polymer processing. In immiscible polymer blends, as typical example of heterogeneous systems, the inner microscopic phase structure of the material has a direct impact on macroscopic end-use properties. Therefore, controlling the morphology of these systems during processing can lead to materials with balanced mechanical and/or barrier properties tailored for particular applications.

 

The research concerns with relationships between rheology and morphology development in immiscible polymer blends under elongational deformation in the molten state. Although elongation is the dominant flow in many polymer processing technologies, there are not many data in the literature concerning polymer blends under extensional deformation. Together with the fact that properties of immiscible polymer blends are distinctively influenced by their phase structure, the study of the morphology development in polymer blends under elongational flow is of great interest. The investigation on the influence of the deformation conditions on the blend behaviour under elongational flow is investigated systematically. Furthermore, the influence of different parameters characterizing the blends morphology on mechanical properties of polymer blends is studied.

 

The research has three main objectives:

 

1. Investigation of the morphology development in immiscible polymer blends during and after elongational flow.

 

2. Investigation of the influence of the compatibilizers on the morphology development under elongational flow.

 

3. Investigation of the influence of concentration, size and shape of the dispersed particles on the mechanical properties of the blend.

 

Figure 1: Morphology of a PS/LLDPE 90/10 blend before (left) and after (right) elongation (T=170 °C, σ=20 kPa). The initially spherical LLDPE particles are deformed into highly elongated fibrils.