Supplementary Information & Data for MECHANICAL CHARACTERISATION AND MODELLING OF A THERMOREVERSIBLE SUPERAMOLECULAR POLYURETHANE OVER A WIDE RANGE OF RATES
Description
The Supplementary data for MECHANICAL CHARACTERISATION AND MODELLING OF A THERMOREVERSIBLE SUPERAMOLECULAR POLYURETHANE OVER A WIDE RANGE OF RATES. The data presented is aims to understand the thermal and mechanical responses of a healable, elastomeric supramolecular polyurethane, examining morphology, rheology and mechanical responses from low to high strain rates. In particular, the current study incorporated a modelling framework based on the characterization of thermal and mechanical properties. The model was able to describe low strain rate behavior under monotonic and cyclic loading, as well as predicting the response to monotonic loading at medium-to-high strain rates.
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The excellent reusability of the polymer was first studied. The structure of specimens with different thermal histories was characterized using nuclear magnetic resonance spectroscopy, gel permeation chromatography and small angle X-ray scattering. Differential scanning calorimetry and Rheometry were used to investigate thermomechanical performance during heating and cooling cycles, whilst large strain compression characterization was performed on a commercial screw-driven test frame, a hydraulic loading system and a split-Hopkinson pressure bar. A viscoelastic softening model was developed and characterized by incorporating data from Rheometry and dynamic mechanical analysis using the principle of time-temperature superposition in a Prony series. The combination of extra identified dashpot and spring allows model describe low strain rate behavior under monotonic and cyclic loading, as well as predicting the response to monotonic loading at medium-to-high strain rates.