Polyvinyl Alcohol (PVA) is a significant water-soluble synthetic polymer produced through the alcoholysis or hydrolysis of polyvinyl acetate (PVAc). It typically appears as a white to pale-yellow solid in the form of granules, powder, or flocculent particles.'
The physicochemical properties of PVA primarily depend on two key parameters: the degree of polymerization (which determines the molecular weight) and the degree of alcoholysis (the percentage of acetate groups replaced by hydroxyl groups). The interplay of these two parameters results in a diverse spectrum of properties: PVA exhibits a wide range of characteristics, ranging from solubility in cold water to requiring hot water for dissolution, and from high flexibility to high tensile strength. Furthermore, it possesses excellent film-forming capabilities, adhesive strength, emulsifying stability, and exceptional biocompatibility; it is also non-toxic, odorless, and environmentally friendly.
Based on these characteristics, PVA has emerged as an extremely versatile chemical raw material. It serves not only as a foundational material for textile sizing agents, high-performance adhesives, paper treatment agents, and packaging films, but is also utilized in biomedical fields-such as pharmaceutical carriers, medical dressings, and tissue engineering scaffolds-due to its excellent biocompatibility. From traditional industries to the frontiers of high technology, PVA plays an indispensable role.