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Friedrich-Wilhelm-Lübke-Koog, Germany

Wilk R.,Menlo Systems GmbH | Kocur S.,Menlo Systems GmbH | Hochrein T.,SKZ Das Kunststoff Zentrum | Mei M.,Menlo Systems GmbH | Holzwarth R.,Menlo Systems GmbH
IRMMW-THz 2011 - 36th International Conference on Infrared, Millimeter, and Terahertz Waves | Year: 2011

We present a novel THz imaging system based on an all-fiber THz-OSCAT spectrometer. First THz-OSCAT images are presented and properties of the system, as well its limitations are extensively discussed. © 2011 IEEE. Source


Damodaran S.,Fraunhofer Institute for Structural Durability and System Reliability | Schuster T.,Fraunhofer Institute for Structural Durability and System Reliability | Rode K.,Fraunhofer Institute for Structural Durability and System Reliability | Sanoria A.,Fraunhofer Institute for Structural Durability and System Reliability | And 2 more authors.
Polymer (United Kingdom) | Year: 2015

The superstructures developed in the welds between injection molded plates made from α-nucleated and non-nucleated isotactic polypropylene (iPP) were analyzed by infrared (IR) microscopy, polarized light microscopy (PLM) and differential scanning calorimetry (DSC). Layers of distinct structures and size formed during welding in the welds were identified by PLM. Deformation of spherulites occurred in the weld seams due to the sheared melt flow. The orientation of the polymer chains in the welds, which is the result of melting and recrystallization, was quantified by IR microscopy for the first time: In the injection molded plates the chains were oriented along machine direction (MD), whereas this pattern changed to normal direction (ND) at the weld seams. Two positions at the welds were inspected to study the orientation of the chains: In one of these the PLM image depicts two well defined weld seams, while at the other, the weld seams were absent. DSC analysis of microtomed sections revealed the presence of both iPP polymorphs in the injection molded plates, whereas in the weld seam and weld core the α- and β-phase, respectively, were found. The degree of crystallinity (Xc) of the welds of iPP calculated using DSC and IR microscopy showed a homogeneous profile across the welds. The antioxidants (AOs) and the nucleating agent were profiled across the weld using IR-microscopy. A significant consumption of AOs during welding could be shown, and, using the principle of IR-dichroism, thermo-oxidative degradation of iPP chains was observed, even in the presence of AOs. The nucleating agent was homogeneously distributed across the weld. © 2015 Elsevier Ltd. Source


Wilk R.,Menlo Systems GmbH | Hochrein T.,SKZ Das Kunststoff Zentrum | Blumel L.,Menlo Systems GmbH | Mei M.,Menlo Systems GmbH | Holzwarth R.,Menlo Systems GmbH
IRMMW-THz 2011 - 36th International Conference on Infrared, Millimeter, and Terahertz Waves | Year: 2011

In this paper we present an all-fiber THz spectrometer based on the OSCAT technique. We investigate its application to non-destructive testing in the polymer industry and analyze a set of polymer samples with different contents of TiO2 as a filler. © 2011 IEEE. Source


Probst T.,University of Marburg | Busch S.F.,University of Marburg | Kraus E.,SKZ Das Kunststoff Zentrum | Baudrit B.,SKZ Das Kunststoff Zentrum | And 2 more authors.
International Conference on Infrared, Millimeter, and Terahertz Waves, IRMMW-THz | Year: 2013

We present a novel THz-TDS system used for the identification of defects in joint plastic. The system utilizes two delay lines, one long, for defect location and the other short, for imaging of the defect. Cross-sectional THz images that reveal defects (air gaps) are been confirmed using CT measurements. © 2013 IEEE. Source


Horlemann S.,SKZ Das Kunststoff Zentrum | Kraus E.,SKZ Das Kunststoff Zentrum | Baudrit B.,SKZ Das Kunststoff Zentrum | Bastian M.,SKZ Das Kunststoff Zentrum | Zabler S.,SKZ Das Kunststoff Zentrum
KGK Kautschuk Gummi Kunststoffe | Year: 2015

The mechanical behavior of bonded PEEK joints was investigated in-situ by means of computed tomography. From the data, the multi-axial strain distribution was analyzed for a tensile shear test of the entire adhesive joint as well as locally in the adhesive layer. For two different loads, the deformation and the overall distortion of the bonded specimen were analyzed in the joining plane during a tensile shear test and compared to simulations. Source

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