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Eingeladener Vortrag
- nein (40)
The potential release of hazardous substances from polymer-based products is currently in the focus of environmental policy. Environmental simulations are applied to expose such products to selected aging conditions and to investigate release processes. Commonly applied aging exposure types such as solar and UV radiation in combination with water contact, corrosive gases, and soil contact as well as expected general effects on polymers and additional ingredients of polymer-based products are described. The release of substances is based on mass-transfer processes to the material surfaces. Experimental approaches to investigate transport processes that are caused by water contact are presented. For tailoring the tests, relevant aging exposure types and release quantification methods must be combined appropriately. Several studies on the release of hazardous substances such as metals, polyaromatic hydrocarbons, flame retardants, antioxidants, and carbon nanotubes from polymers are summarized exemplarily. Differences between natural and artificial exposure tests are discussed and demonstrated for the release of flame retardants from several polymers and for biocides from paints. Requirements and limitations to apply results from short-term artificial environmental exposure tests to predict long-term environmental behavior of polymers are presented.
Materials are subject to environmental constraints that include biological, chemical and physical factors. To gain confidence about durability and long-term performance of any material, environmental resistance testing procedures have to be amended with modern simulation procedures that include biological components. In fact, any environmentally exposed surface at temperatures lower than 121 °C will be home to microbial growth, even at high salt concentrations, extreme pH, environmental pollution, low water potential, and intense irradiation – everywhere where water is liquid and available. As a consequence, complex microbial ecosystems called biofilms are self-sufficient and found on almost all solid-air-water interfaces. Obviously, environmental changes perturb biofilm development but over a number of seasons, these changes result in relatively stable microbial communities peculiar and adapted to a particular niche and material. Certain microbial settlers are indicative of, and in a real sense mark, a particular biofilm and can, thus, be considered as “reference organisms”. Characteristic reference organisms’ peculiar to specific material-inhabiting communities can be isolated, identified, characterised and used in standard test procedures as well as research into materials science (materials improvement). In this presentation classical microbiological, genetic and molecular methods for studying reference organisms and their roles in materials deterioration will be presented. We will present a set of different reference organisms that are currently in focus of our research and testing development.