To perform mechanical testing, the mats were cut into 5 × 45 mm samples using a laser engraving machine, the LaserPro Spirit GLS (GSS, Taipei City, Taiwan), equipped with a 100 W CO2 laser. The thickness of each sample was measured immediately before the experiment using a contact measurement gauge (Logitech, Lausanne, Switzerland). Tensile testing was carried out using the TA.XTPlus Connect testing machine (Texture Technologies Corp. and Stable Micro Systems, Godalming, UK). The ultimate elongation at break and ultimate stress were determined for dry and wet (after 30-min incubation in PBS) samples by uniaxial stretching at a linear speed of 5 mm min−1.
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