Modelowanie mechaniki międzyfazowej w mieszaninach polimerowych PE/PS i PP/PS przetwarzanych metodą mieszania w stanie stopionym oraz wysokociśnieniowego skręcania (HPT)

The deposited materials support the study of interphase-driven mechanics in immiscible polymer blends composed of polyethylene/polystyrene (PE/PS) and polypropylene/polystyrene (PP/PS). The investigated blends were prepared using two different processing routes: conventional melt mixing and solid-state processing by high-pressure torsion (HPT), enabling a comparative analysis of the influence of processing conditions on the mechanical behavior of the systems.The collection includes results associated with the characterization and analysis of the mechanical response of the investigated polymer blends. These materials combine experimental observations with numerical simulations performed using a multiphase constitutive modeling framework. The modeling approach explicitly considers the contributions of crystalline, amorphous, and interphase regions to the overall mechanical behavior of the blends.The experimental component includes stress–strain responses obtained from uniaxial tensile tests performed on PE/PS and PP/PS blends. Mechanical properties were measured using an Instron 5582 universal testing machine at room temperature. Rectangular specimens (15 × 5 mm) with an initial gauge length of 10 mm were tested at a constant strain rate of 8.33 × 10⁻⁴ s⁻¹. Each material configuration was tested five times to ensure reproducibility and statistical reliability of the measurements.The numerical component includes simulated stress–strain responses obtained for polymer blends with different compositions and interphase characteristics. These simulations were performed using a multiphase constitutive model describing the coupled elastic–viscoplastic–viscohyperelastic behavior of the different microstructural domains present in the blends.The attached materials are provided in the form of Excel files containing stress–strain responses and corresponding numerical simulation results used in the analysis presented in the associated scientific publication.