An inclusive study on the effect of polyurethane component variation on the dynamic mechanical properties of EP/PU IPNs in multiple modes

Interpenetrating polymer networks (IPNs) constructed from polyurethane (PU) and epoxy resin (EP) are high-performance polyester-based materials. In this study, we systematically investigated the effect of variation in the PU component, including its content and molecular weight, on the property of EP/PU IPNs. The focus was on the changes in dynamic mechanical properties, characterized and analyzed through dynamic parameters under different modes, to reveal the influence of the PU component on the energy dissipation capacity of the material. Additionally, we conducted performance tests on IPNs materials constructed with different polyols, with a particular emphasis on dynamic mechanical property, and identified the superior PCL-2000 series (the effective damping temperature range △T is close to 50 °C in tensile mode, and the peak of the loss factor in compressive mode still reaches nearly 0.8). These findings constitute a comprehensive study on the dynamic mechanical property of EP/PU-based materials and provide crucial data support and empirical analysis for the development of high-energy functional material.