Polymeric coating with durable antifogging performance

Scientists describe an amphiphilic polymeric coating with excellent and durable antifogging properties. The UV-initiated in situ crosslinking reaction of BP groups in polymer bulk and the interface was demonstrated to avoid coating detachment effectively.

A foggy surface is caused by the condensed droplets scattering the visible incident light. Consequently Image source:  Rupert Kittinger-Sereinig - Pixabay (symbol image).

Foggy surfaces can damage the optical performance of devices and even cause adverse consequences like safety concerns in some cases. Various antifogging coatings have been proposed to relieve this trouble. Nevertheless, most coatings suffer from temporary fog-repellency features due to hygroscopic swelling behavior and detachable interface. Researchers have now reported an antifogging coating with persistent fogging prevention via the introduction of the amphiphilic polymer and interfacial layer.

Excellent fog-repellency

With the aid of benzophenone (BP) groups, both bulk crosslinking and interfacial bonding were achieved to prevent relatively macroscopic motions of coating from the substrate under extreme conditions. In virtue of the minor swelling and interfacial adhesion, the coating could preserve the fog-free behavior after 50-cycle antifogging tests and even aging for 90 days under harsh conditions.

The study has been published in Progress in Organic Coatings, Volume 179, June 2023.

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