Polymer Analytics und Assessment

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Thermogravimetric analysis: determination of mass or mass change of a sample of PV encapsulation materials as a function of time and temperature.

We offer our customers comprehensive thermo-mechanical and chemical analytics of polymeric materials. The core competence lies in products from the fields of photovoltaics and laminated safety glass (LSG), such as EVA, PVB, polyolefins, PET and polycarbonates. A further focal point is processing using a wide variety of lamination techniques.

In the area of special analytics, we investigate gas permeation through barrier films and membranes. In addition to commercial equipment, we also use in-house methods. Thus, a multitude of gases and gas mixtures can be analyzed, even simultaneously.

Depending on customer requirements, we offer both standardized order analyses and complex cause and behavior analyses of polymer materials. In addition to individual orders, we also carry out extensive research and development projects with you.

Our research facility is certified according to DIN ISO 9001.


Services

  • Comprehensive characterization of polymer materials in our modern analytical laboratory (DSC, TGA, Rheology, DMA, TMA, FTIR, UV-Vis, TGA-FTIR, WVTR, Karl Fischer Titration, Yellowness Index, Extraction)
  • Ageing of polymers due to the influences of temperature, thermal cycling, humidity and UV radiation
  • Determination of barrier properties (transmission, permeation, breakdown times) of e.g. foils or membranes for various gases and gas mixtures (H2O, O2, H2S, CO2, etc.) as well as volatile liquids (e.g. acetic acid)
  • Lamination of e.g. solar modules or laminated safety glass with large formats (up to 220x260 cm) or 3-dimensional structures (up to 30 cm pitch height). Production of laminate test specimens and investigation of adhesion behaviour (peel tests)

Examples

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Helium Transmission.

A high barrier effect, especially against water, is an essential quality feature of films for a wide range of applications. The water vapour transmission (WVTR) serves as a measure for this barrier property. As an alternative, we have an apparatus for quantifying helium transmission. This shortens the measurement time from approx. 24 hours to less than 1 hour. The transmission of other gases or gas mixtures (e.g. hydrogen sulphide) can also be determined in this way. These measurements serve as a basis for the calculation of diffusion coefficients.

Schulze, S.-H.; Ehrich, C.; Meitzner, R.; Pander, M. Prog. Photovoltaics Res. Appl. 2017, 25, 1051

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Matthias Schak and Michael Wendt while equipping the 3D vacuum laminator.

With the 3D laminator from SM Innotech, laminates up to 120x220 cm can be produced by heating the upper and/or lower heating plate. The special: The laminator also allows an overall height of 30 cm in the 3rd dimension. This enables us to produce complex spatial structures by lamination.

The thermally activated spatial cross-linking of EVA (ethylene-vinyl acetate copolymer) during the lamination of solar modules or laminated safety glass represents a decisive process step. The mechanical properties of EVA and EVA glass adhesion can be massively influenced by the choice of parameters. Incompletely converted crosslinkers (an organic peroxide) and remaining linear EVA chains (gel content) also have an influence on the long-term properties of the composite. The kinetics of the crosslinking reaction can be reliably determined by means of dynamic differential calorimetry (DSC). Supplementary tests with one of our laminators allow us to scale the laboratory results to technical equipment.

Ehrich, C.; Schulze, S.-H. News Analytik 2011, 1.