In the underlying study, a Zwick 1445 universal testing machine (Zwick GmbH& Co.KG, Ulm, Germany) was used to perform the tensile tests (ISO 527) on the PTU/ZnO composites with an initial load of 5 N and an applied constant strain rate of 1 mm/min. For testing PDMS, the initial load was set to 0.1 N and the strain rate to 20 mm/min. The samples were prepared by the mixture casting into a dog-bone shaped silicone mold. The effective dimensions of the samples were 20 mm in length, 5 mm in width and 1 mm in thickness. The Young’s Modulus was calculated from the stress–strain relationship using Hooks Law below (2), as described in [31]. The mean values and standard deviations of ten samples for every PTU/ZnO composite and PDMS were calculated using OriginLab (OriginLab Corporation, Northampton, MA, USA).

where E is the elastic modulus, σ is the stress and ε the strain.

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