The copolymer solid was melted into low-viscosity liquid by heating, followed by its deposition onto a substrate. The deposition area was fixed as 2.0 cm × 2.0 cm. After the deposition, another substrate was used to hot-press the deposited copolymer liquid. The thickness of the copolymer between the two substrates was 50 μm, which was precisely controlled by quartz powder added between the substrates. The cooling process was controlled by a hot plate at a rate of 5°C/min. The shear strength experiments were performed on an HY-0580 tension machine (HENGYI Company). The two substrates adhered between the two fixtures in a vertical direction. The strain rate was 5 mm/min, and the data were recorded in real time.

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