Introduction -- Theoretical background -- General description of the experimental methods -- Investigation of the semicrystalline structure of EVA and ionoplastic interlayers -- Identification of time-superposition principles for EVA and ionoplastic interlayers -- Determination of the linear viscoelastic behaviour and linearity limits for PVB -- Characterization of the nonlinear viscoelastic behaviour of PVB -- Application to engineering practice -- Summary and outlook Bibliography -- Appendix -- A Additional data -- B List of publications, presentations and workshops.