Charakterisierung der temperaturabhängigen Eigenschaften von partikelgefüllten Polymeren

• Applicant: Professor Dr.-Ing. Bernd Weidenfeller
• Subject Area: Polymer Materials
• Term: from 2008 to 2013
• Project identifier: Deutsche Forschungsgemeinschaft (DFG) - Project number 86197527

Especially in micro electronics, evoked by a rising performance of active elements, heat transfer gets more and more important. One goal is to enhance the thermal conductivity of materials in electronic components or around by developing polymer based matrix materials with functional fillers. Additionally the change of thermal properties of materials also changes process parameters in during production. For example: a higher thermal conductivity evokes a shortening of the injection molding cycles in production process of polymers. In spite of the importance of these parameters, nearly no values can be found in literature and can not be calculated. Thus, parameters are obtained by trial and error. Unfortunately until today there are no theoretical models which can be used to calculate thermal conductivity of composites. Only with an empirical model by Agari and Uno measurement values can be calculated reproducibly. Nevertheless, the physical meaning of 2 constants used by the model is not known sufficiently known to ensure a theoretical calculation of thermal diffusivity. Results of thermal diffusivity will be compared with measured cooling curves of the injection molding process, whereas a model based description of the cooling behavior of the composites will be developed. Goal of the proposal is to give a contribution for model based descriptions of the thermal diffusivity of composites as well as the influence of thermal diffusivity on the cooling behavior during injection molding.

• DFG Programme: Research Grants
• Major Instrumentation: Laserflash-Anlage
• Instrumentation Group: 5700 Festkörper-Laser