Institute of Polymer Materials and Plastics Engineering

Clausthal-Zellerfeld, Germany

Institute of Polymer Materials and Plastics Engineering

Clausthal-Zellerfeld, Germany
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Berg D.C.,Institute of Polymer Materials and Plastics Engineering | Dickert M.,Institute of Polymer Materials and Plastics Engineering | Aranda S.,Institute of Polymer Materials and Plastics Engineering | Ziegmann G.,Institute of Polymer Materials and Plastics Engineering | Drechsel M.,Volkswagen AG
ECCM 2012 - Composites at Venice, Proceedings of the 15th European Conference on Composite Materials | Year: 2012

The present work presents the results of a study on the permeability and compac-tion behaviour of textiles under shear deformation. In this study a 0°/90° non-crimp carbon fibre fabric with an areal weight of 200 g/m2 is used. The influence of shear is observed under two conditions: constant cavity height and constant fibre volume content (FVC). Permeability measurements were conducted as two-dimensional flow. Additional compaction tests of the sheared textiles lead to a more thorough understanding of the mechanisms at work. It is shown that for constant cavity heights the behaviour of the textile greatly changes be-tween a shear angle of 15° and 20°. Up to an angle of 15° the permeability shows a linear increase for the principal axis and a linear decrease for the secondary axis. At shear angles above 20° the behaviour for both is non-linear. Furthermore this change of behaviour can also be observed in the rotation of the flow ellipse and the compaction measurements. Both show a double-linear development with a change of behaviour in the region of 15° to 20°.


Xie L.,Institute of Polymer Materials and Plastics Engineering | Zhu D.,Institute of Polymer Materials and Plastics Engineering | Ziegmann G.,Institute of Polymer Materials and Plastics Engineering | Steuernagel L.,Institute of Polymer Materials and Plastics Engineering
Nanotechnology 2010: Electronics, Devices, Fabrication, MEMS, Fluidics and Computational - Technical Proceedings of the 2010 NSTI Nanotechnology Conference and Expo, NSTI-Nanotech 2010 | Year: 2010

Micro injection molding has been attracting more and more market attentions, due to realizing the large scale cost effective production of Micro Electronic Mechanic System (MEMS) components. However, there are some defects which cannot be avoided in micro injection molded parts, like the weld line. Two sorts of weld lines are mentioned: Hot and cold weld line. Many significant meaningful research achievements have been done, focusing on the weld line issue of normal size injection molding, but the aspect in the weld line developing in micro injection molding process is relative limited. In the presented study, in order to reveal the correlation between cold/hot weld line mechanical properties and micro injection molding processing parameters, two molds with variotherm unit are designed and constructed, in which the hot-/weld line micro dog bone tensile specimens (section dimension 0.1 (Depth)×0.4(Width) ×12(Length) mm) can be prepared. Polypropylene(PP) was used as the processing materials in the experiments, and six processing parameters were considered as the main factors related to weld lines mechanical properties, which are injection pressure, holding pressure, melt temperature, mold temperature, injection speed and ejection temperature.


Stubler N.,Institute of Polymer Materials and Plastics Engineering | Meiners D.,Institute of Polymer Materials and Plastics Engineering | Ziegmann G.,Institute of Polymer Materials and Plastics Engineering | Hickmann T.,Eisenhuth GmbH and Co. KG
Zeitschrift Kunststofftechnik/Journal of Plastics Technology | Year: 2014

This work presents a comparative study of the effect of the polymer matrix on the thermal, electrical and mechanical properties of highly-filled graphite polymer composite. This material was destined to be used as bipolar plates in proton exchange membrane fuel cell (PEMFC). In order to investigate the synergetic effect between Gr (Graphite) and CB (carbon black) particles the polymer PVDF (poly (vinylidene fluoride)) was mixed with 15% wt of CB and 70% wt. of Gr. The results were offering a high value of the electrical conductivity (-176 S/cm), while the value of the electrical conductivity of Gr/PVDF composite is about 87 S/cm. A correlation between the thermal and electrical conductivity was explored for the samples filled only with graphite (without CB). © Carl Hanser Verlag.


Li S.-B.,Central South University | Kirchberg S.,Institute of Polymer Materials and Plastics Engineering | Xie L.,Institute of Polymer Materials and Plastics Engineering | Jiang B.-Y.,Central South University
Gaofenzi Cailiao Kexue Yu Gongcheng/Polymeric Materials Science and Engineering | Year: 2010

In order to explore whether soft magnetic modified plastic can be produced by injection molding, 8 different volume fractions iron silicon powder were compounded with the polypropylene matrix. Composite material's viscosity, thermal conductivity and specific heat capacity were measured, flow ability of the composite materials were measured. Furthermore, rheological data are fitted through Levenberg-Marquardt+Universal Global Optimization algorithm and the parameters of Cross-WLF viscosity model are obtained. Comparing with flow ability injection molding test results, numerical simulation results are consistent with the trend of experiments. The results show that with iron silicon increasing, viscosity is increasing, heat capacity is reducing, heat conductivity is increasing, flow ability becomes poor. When iron silicon volume fraction is 70%, flow ability is only 15% as the case of pure polypropylene. Therefore, when producing complex shape soft magnetic modified plastic part by injection molding, lager injection pressure and higher melt temperature are necessary.

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