Mechanical characterisation and modelling of a thermoreversible superamolecular polyurethane over a wide range of rates

Understanding the mechanical response of thermo-recoverable elastomers to applied deformation at different strain rates and temperatures is crucial for more effective exploitation these reusable materials in industrial applications. The research presented this paper aims understand thermal responses a healable, elastomeric supramolecular polyurethane, examining morphology, rheology from low high rates. In particular, measurement rate modulus, or strength, challenging, current addresses by incorporating modelling framework based on low-rate characterization. To support research, significant characterization experiments have been performed, which also show, first time, excellent reusability polymer. structure specimens with histories was characterized using nuclear magnetic resonance spectroscopy, gel permeation chromatography small angle X-ray scattering. Differential scanning calorimetry Rheometry were used investigate thermomechanical performance during heating cooling cycles, whilst large compression performed commercial screw-driven test frame, hydraulic loading system split-Hopkinson pressure bar. describe polymer, viscoelastic softening model developed characterized. incorporates data rheometry dynamic analysis principle time-temperature superposition Prony series, combined non-linear response, recovery. able behaviour under monotonic cyclic loading, as well predicting medium-to-high 40 1220 s−1. therefore demonstrates effectiveness theory its analytical calibrate further predict polymers rates: particularly useful modulus challenging.