Determination of the linear viscoelastic material behaviour of interlayers with semi-crystalline structures shown by the example of a semi-crystalline ionomer

Abstract The temperature dependent linear viscoelastic material behaviour of the most commonly used interlayer PVB is typically determined by means Dynamic-Mechanical-Thermal-Analysis (DMTA). By horizontally shifting isothermal modulus curves, a mastercurve created at certain reference temperature, which can then be mathematically approximated with Prony series. A time–temperature superposition principle derived from shift factors. In contrast to PVB, EVA and ionomer (or ionoplastic) interlayers have semi-crystalline structures that melt when melting reached form again sample cooled below crystallization temperature. exact structure number crystallites depend e.g. on cooling rate physical age thermal prehistory) sample. These factors must taken into account in experimental determination parameters DMTA. Using example SentryGlas ® , this article shows stiffness affected crystallinity. Mastercurves DMTA different programs are created. degrees for Differential Scanning Calorimetry (DSC). principle, applies purely amorphous material, time-crystallinity derived, enable temperatures crystallization.