PVA (Mw 145000, 99+% hydrolyzed, ～3300 polymerization) is a polyvinyl alcohol with a molecular weight of 145000, exhibiting hydrolytic properties. The degree of hydrolysis refers to the conversion rate of acetyl groups into hydroxyl groups in the original polyvinyl acetate. PVA is produced by the polymerization of vinyl acetate, followed by hydrolysis to remove acetyl groups. Polyvinyl alcohols with varying degrees of hydrolysis can be utilized in forming self-crosslinked cryogels, which serve as bio-auxiliary materials.