The hydrophilicity of inorganic polysilazane coatings is mainly based on the following principles:

Chemical bonding introduces hydrophilic groups
There are active functional groups such as Si-N and Si-H groups in inorganic polysilazane coatings, which can react chemically with substances containing hydrophilic functional groups such as hydroxyl and carboxyl groups. For example, by chemically bonding with active functional groups on small molecule alcohols, carboxylic acid compounds, or polymer molecules with hydroxyl groups, these hydrophilic groups are introduced into the molecular structure of the polysilazane coating, thereby reducing the surface energy of the coating and making it easier for water to spread on its surface, exhibiting hydrophilicity. When water molecules come into contact with the coating surface, they can form hydrogen bonds and interact with these hydrophilic groups, promoting water adhesion and spreading.

Hydrolysis conversion generates hydrophilic structures
Some inorganic polysilazanes undergo hydrolysis reactions under specific conditions, for example, fully hydrogenated polysilazanes can gradually convert their Si-N bonds to Si-O bonds in a certain environment. After the formation of silicon oxygen bonds (Si-O), the coating surface will have more structural characteristics similar to silica, and the silica surface is rich in hydroxyl groups. Hydroxyl groups can form hydrogen bonds with water molecules, making the coating have a strong affinity with water, thereby exhibiting hydrophilicity. The water contact angle can be significantly reduced, and even reach a super hydrophilic state of less than 10 degrees.

Surface microstructure changes
Some inorganic polysilazane coatings may form some microscopic rough structures on their surfaces during preparation or subsequent treatment, such as the superhydrophobic "lotus leaf effect". When the surface microstructure is suitable, it can actually enhance hydrophilicity, which is the so-called "superhydrophilic effect". For example, by using some special processes to form nanoscale concave convex structures on the surface of the coating, when water molecules come into contact with such surfaces, they can better adsorb and spread in the gaps, protrusions, and other parts of the microstructure, ultimately exhibiting overall hydrophilicity.

Room termperature curing polysilazane, pls check IOTA 9150, IOTA 9150K.       
High termperature curing polysilazane, pls check IOTA 9108, IOTA 9118.