Improving mechanical and water vapor barrier properties of the parylene C film by UV-curable polyurethane acrylate coating

Parylene C (PC) films have been widely used in many fields, such as metal anti-corrosion, electronic packaging, etc. However, the relatively poor mechanical properties and the deteriorated water barrier performance due to the easy fracture under external stress have restricted their application. It is a relatively simple and good method to maintain the water vapor barrier and enhance the mechanical properties of PC film by covering a flexible coating on its surface. In this work, a new polyurethane acrylate (PUA) coating was prepared and coated on the PC film by ultraviolet curing technology to form the PC/PUA composite film. The results showed that the PUA coatings could improve the water vapor barrier and mechan-ical properties of the PC film simultaneously. The water vapor transmittance rate was reduced from 1.1791 gmiddot(m(-2).day(-1)) of the original PC film to 0.5636 gmiddot(m(-2).day(-1)) of the PC/PUA composite film. The elongation at break and the impact energy were increased to 48.36% and 41.67%, respectively, which would widen the application of PC films in the fields of flexible electronics or smart wear.

Automated summary

By coating a new polyurethane acrylate (PUA) coating on the surface of Parylene C films, it is possible to effectively improve their water vapor barrier and mechanical properties, which widens the potential applications of PC films in the fields of flexible electronics or smart wear.