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Influence of filler content and geometry of soft magnetic particles on processing and material properties of selected thermoplastics

Particle filled soft magnetic polymers attract great attention in industrial applications to produce functional components and structural elements, such as electromagnetic screening devices or in electrical machines. Beside the specific adjustable magnetic, mechanical, thermal and electrical properties, the cost and time efficient production of complex geometries in compounding and injection molding processes results in significant economic advantages.

Functional soft magnetic composites can be processed in melt processes with filler contents up to 70 vol.-% and show good reproducibility of micro structured surfaces in micro injection molding process using filler contents up to 50 vol.-%. The flow ability of the examined composite melts depends on the process parameters as well as on the filler content and geometry of the particles. Similarly, the structural properties of the amorphous and semi-crystalline polymer matrices (molecular mass distribution, thermal stability, degree of crystallinity and glass transition temperature) are influenced by the content and geometry of the particles as well.

The functional properties of the injection molded samples are mainly affected by the filler content. Theoretical models were used to describe and predict the material properties depending on the filler content. Exemplary, the flow length of the composite melt in injection molding process and in simulation were compared, which shows a good correlation between processing behavior and material properties.

Based on the results of this work, the processing behavior and material properties of the ex-amined polymer-particle composites can be described and predicted. Therefore, further applications of these functional materials in industrial sectors are supposable.

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Author
 Stefan Kirchberg

Stefan Kirchberg
Institut für Polymerwerkstoffe und Kunststofftechnik
Technische Universität Clausthal

Information

Free keywords: Soft magnetic composites, polymer-particle composites, highly filled polymers, functional polymers, polymer processing, (micro) injection molding, process simulation, flow behavior, functional properties, structural properties
Institute / chair: Technische Universität Clausthal
Language: German
Technical consultant for expert services: Prof. Dr.-Ing. Gerhard Ziegmann (Betreuer), Prof. Dr.-Ing. Urs A. Peuker
Publication year: 2009
Provider: Wissenschaftlicher Arbeitskreis Kunststofftechnik (WAK) / Kunststoffe.de

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