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Die Untersuchung beschäftigt sich mit einer neuen Spritzgießtechnologie zur Herstellung von Bauteilen aus Elastomeren. Mit dieser Technologie sind kürzere Zykluszeiten bei gleichbleibenden Bauteileigenschaften möglich. Die Höhe der Heizzeitreduzierung hängt von der Art der Bestimmung derselben ab und wird in der vorliegenden Arbeit auf unterschiedliche Weise quantitativ bestimmt. Je nach Verfahrensparameter und Bestimmungsmethode treten
Heizzeitreduzierungen von maximal etwa 40 % auf. Weiterhin werden Untersuchungen an den hergestellten Bauteilen durchgeführt, welche die Interpretation des Ausmaßes und der Qualität der Vernetzungsdichte über dem Probenquerschnitt erlauben. Es können deutliche Heizzeiteinsparungen bei mindestens gleichbleibenden und teilweise homogeneren Vernetzungsdichten über dem Querschnitt eines dickwandigen Elastomerbauteils attestiert werden.
Moderne Elastomere
(2009)
Semi-quantitative mechanical characterisation of fibre composites in the sub-micron-range by SFM
(2001)
Erratum: Homogeneity of Fillers Loaded Rubbers Investigated by the Dynamic Indentation Method
(2002)
The ongoing miniaturization, multi-layer structure parts and hybrid parts require methods to determine mechanical properties on a micro-scale. However, there is a gap in measuring techniques. On one hand there are the classical methods to measure hardness e.g. VICKERS, ROCKWELL, UNIVERSAL, IRHD etc having resolutions typically above 100μm. On the other hand there are well-developed AFM methods that allow for the determination of mechanical properties in the nanometer range. This paper describes an indentation technique that yields data of mechanical properties in the micrometer range between typically 5 to 50 μm. The measuring device and the data evaluation is presented. Results of micro-mechanical mapping are shown for NR-SBR rubber interfaces, a fuel tank and a part manufactured by two component injection moulding. Finally, the measured micro-mechanical stiffness is compared to the YOUNG’s modulus of the corresponding materials.
The ongoing use of miniaturization, multi layer structure parts, and hybrid parts requires methods to determine mechanical properties on a micro scale. However, there is a gap in measuring techniques. On one hand there are the classical methods to measure hardness, e.g., Vickers, Rockwell, Universal, and IRHD, having resolutions typically above 100 µm. On the other hand, there are well-developed AFM methods that allow for the determination of mechanical properties in the nanometer range. This article describes an indentation technique that yields data of mechanical properties in the micrometer range between typically 5 and 50 µm. The measuring device and the data evaluation are presented. Results of micro-mechanical mapping are shown for NR-SBR rubber interfaces, a fuel tank, and a part manufactured by two-component injection molding. Finally, the measured micro-mechanical stiffness is compared to the Young's modulus of the corresponding materials.
The heterogeneous effects due to filler interactions and chain dynamics of reinforcing nano-filler particles were characterized on a series of filled EPDM elastomers using the Payne effect and low field NMR, 1H transverse (T2), longitudinal (T1) and longitudinal in rotating frame (T1ρ) relaxation time measurements. Measurement of the Payne effect and NMR relaxation curves were used to obtain the distribution of filler/filler interactions and chain dynamics by one-dimensional Laplace inversion. Distributions of shear-strain constants in the Payne effect reveal the existence of weak, medium and strong filler/filler interactions which were correlated to filler properties and content. The analysis of relaxation-time distributions leads to the identification of multimodal polymer network dynamics.