Which plastic is right for what application and how technically safe these products and construction units manufactured from plastics are can only be answered using informative measurement and test methods. The Federal Institute for Materials Research and Testing (BAM) works on the development of methods which answer these questions. BAM presents its know-how in the field of plastics at the K 2007 fair from 24 to 31 October in Hall 4, Booth D14, in Düsseldorf.
BAM has developed highly realistic methods for simulating the degradation process of plastics in a few months using accelerated testing. For this purpose the plastics are exposed to aggressive media, e.g. diluted acids or bases, at elevated temperatures and increased pressures. So a realistic estimate for the expected life span of geosynthetics in the soil has to be provided using this method. Geosynthetics are one of a number of materials used for slope stabilisation or in road construction where the strength needed must be maintained over many decades. It is controlled by the chemical structure of the plastics which can be impaired or destroyed under the effect of water and oxygen in the soil.
An ultrasound method developed by BAM now enables the on-line monitoring and control of the hardening process of plastics which contain glass or carbon fibres. These strengthened plastics are increasingly being used because of their high mechanical load bearing capacity and their low weight in high-tech construction units in the aeronautical and space industry and in car manufacture. The construction units are produced from liquid resin at temperatures between 100 °C and 200 °C by a chemical reaction. At a given chemical composition the hardening process determines the chemical structure of the plastic. This affects strength and eventually the technical safety. Hardening time plays a crucial role: it must be neither too long nor too short. If it is too short, mechanical stability is not guaranteed. If it is too long, the product is too expensive since a long hardening time does not improves characteristics any further.
A special importance is attributed to the flame retardation of plastics under the heading of technical safety within the public realm. Work is being carried out in BAM to clarify and understand the burning and flame retardation mechanisms of plastics where thermal decomposition of plastics and pyrolysis products are investigated and the fire risk is determined. The findings should be integrated into the development of new flame-retarded products.Information:
Dr. Ulrike Rockland | idw
In borophene, boundaries are no barrier
17.07.2018 | Rice University
Research finds new molecular structures in boron-based nanoclusters
13.07.2018 | Brown University
For the first time ever, scientists have determined the cosmic origin of highest-energy neutrinos. A research group led by IceCube scientist Elisa Resconi, spokesperson of the Collaborative Research Center SFB1258 at the Technical University of Munich (TUM), provides an important piece of evidence that the particles detected by the IceCube neutrino telescope at the South Pole originate from a galaxy four billion light-years away from Earth.
To rule out other origins with certainty, the team led by neutrino physicist Elisa Resconi from the Technical University of Munich and multi-wavelength...
For the first time a team of researchers have discovered two different phases of magnetic skyrmions in a single material. Physicists of the Technical Universities of Munich and Dresden and the University of Cologne can now better study and understand the properties of these magnetic structures, which are important for both basic research and applications.
Whirlpools are an everyday experience in a bath tub: When the water is drained a circular vortex is formed. Typically, such whirls are rather stable. Similar...
Physicists working with Roland Wester at the University of Innsbruck have investigated if and how chemical reactions can be influenced by targeted vibrational excitation of the reactants. They were able to demonstrate that excitation with a laser beam does not affect the efficiency of a chemical exchange reaction and that the excited molecular group acts only as a spectator in the reaction.
A frequently used reaction in organic chemistry is nucleophilic substitution. It plays, for example, an important role in in the synthesis of new chemical...
Optical spectroscopy allows investigating the energy structure and dynamic properties of complex quantum systems. Researchers from the University of Würzburg present two new approaches of coherent two-dimensional spectroscopy.
"Put an excitation into the system and observe how it evolves." According to physicist Professor Tobias Brixner, this is the credo of optical spectroscopy....
Ultra-short, high-intensity X-ray flashes open the door to the foundations of chemical reactions. Free-electron lasers generate these kinds of pulses, but there is a catch: the pulses vary in duration and energy. An international research team has now presented a solution: Using a ring of 16 detectors and a circularly polarized laser beam, they can determine both factors with attosecond accuracy.
Free-electron lasers (FELs) generate extremely short and intense X-ray flashes. Researchers can use these flashes to resolve structures with diameters on the...
13.07.2018 | Event News
12.07.2018 | Event News
03.07.2018 | Event News
17.07.2018 | Information Technology
17.07.2018 | Materials Sciences
17.07.2018 | Power and Electrical Engineering