Silicone bonding is used in the construction of glass façade systems, to name just one of many applications (see e.g. [1]). The glass elements in such systems are bonded directly to the underlying support system. The mechanical behavior of polymeric materials is highly complex. Therefore, in addition to classical experimental investigations, constitutive models can make a valuable contribution to a deeper understanding of the material behavior. Both time-dependent and thermal effects have been observed in the mechanical response of this type of materials. In particular, the accumulation of damage in these materials often shows a strong dependency on loading rates, beyond the well-known viscoelastic behavior. The proposed constitutive framework captures these phenomena through a fully coupled thermomechanical formulation that considers large strains and combines viscoelasticity with a rate-dependent Perzyna-type damage formulation (see [2]). The material model includes a deformation gradient that is multiplicatively decomposed into a thermal and a mechanical part as well as into equilibrium and non-equilibrium parts. Furthermore, the gradient extension is added to regularize the damage field (see [3]). The model is capable of describing damage due to both creep and relaxation. In a further step, a staggered approach is followed in order to determine the material parameters of a polymeric material by experimental data. REFERENCES [1] F. de Buyl, Silicone sealants and structural adhesives. Int. J. Adhes. Adhes. (2001) 25: 411422. [2] L. Lamm, A. Awad, J. M. Pfeifer, H. Holthusen, S. Felder, S. Reese, and T. Brepols, A gradient-extended thermomechanical model for rate-dependent damage and failure within rubberlike polymeric materials at finite strains. Int. J. Plast. (2024) 173: 103883 [3] T. Brepols, S. Wulfinghoff, and S. Reese, A gradient-extended two-surface damage-plasticity model for large deformations. Int. J. Plast. (2020) 129: 102635