Why the contact angle increase with the increase of uv irradiation time?

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Guido Bognolo

Before I can answwer your questionn I need a few clarifications.

What did you irradiate: the surface,the liquid or both?

What was the surface?

What was the liquid

G. Bognolo

Chehat Nour El Houda

Guido Bognolo I irradiated the surface of my films (Polymer) with UV radiation, after I do the characterization for the contact angle, the liquid was water

I think the UV radiation may cause the breakingbof siome multiples bonfin in the polymer film, thus increasing its hydrophobicity.

Best regards