fig5

Figure 5. Demonstration of interfacial pressure mapping using PCN-128 films and coatings. (A) Schematic diagram illustrating the measurement of interface pressure in threaded fasteners using PCN-128 film (Scale bars: 1 cm); (B) PCN-128 film images (under UV) and ΔE_ab maps of the interface pressure testing process for threaded fasteners (Scale bars: 1 cm); (C) Large-area PCN-128 film (10 × 10 cm, under daylight and UV); (D) Interface pressure detection for the assembly of large-scale fasteners (Scale bars: 5 mm); (E and F) Detection of contact pressure on double-curved surfaces using sprayed PCN-128 film (Scale bars in E and F: 0.5 cm). UV: Ultraviolet; ΔE_ab: the color difference of PCN-128 film before and after compression.