*3.7. WCA*

The static water contact angle was recorded following the protocol reported by Lalia et al. [57]. The WCA of all samples was studied with a video optical contact angle measurement instrument (OCA15EC, DataPhysics, Filderstadt, Germany) and the sessile drop method. The samples were fixed on a glass slide, and deionized water (2 μL) was dispensed slowly onto the surface with a water rate of 5 μL/s. The water contact angle was measured at 3 s, and five different sites were measured from each sample to determine the uniform distribution of the samples. The images and calculation of the angle of the drop contact surface on both sides were recorded and analyzed with SCA20 (DataPhysics, Filderstadt, Germany) software.

### *3.8. Mechanical Properties*

Sample mechanical properties were measured using a uniaxial tensile test according to the methods described by Zhu et al. [58]. Samples were trimmed into 1 cm × 5 cm strips, and both ends (1 cm on each side) of the samples were gripped by the fiber tensile tester (XQ −1C, New Fiber Instrument Co. Ltd., Shanghai, China). Material stress–strain curves were obtained through load deformation. The data were recorded by measuring the tensile strength and elongation at break at a tensile speed of 20 mm/min.
