polyvinylpyrrolidone molecular structure

polyvinylpyrrolidone molecular structure：

Polyvinylpyrrolidone molecular formula：(C6H9NO)n

Polyvinylpyrrolidone, non-ionic polymer compound, white or milky white powder or particle, is a hygroscopic and easy to flow powder, odorless or slightly odorless, soluble in water, alkali, acid and polar organic solvents, with strong expansion properties and complex ability with a variety of substances. Since polyvinylpyrrolidone is soluble in both water and most organic solvents, has low toxicity and good biosolubility, it is used in medicine, food and cosmetics, which are related to people’s health.

Nature of PVP
polyvinyl pyrrolidone (PVP), a non-ionic polymer, is the most distinctive and widely studied fine chemical variety among N-vinyl amide polymers. At present, it has developed into non-ionic, cationic, anion 3 categories, industrial grade, pharmaceutical grade, food grade 3 specifications, relative molecular mass from thousands to more than one million homopolymer, copolymer and crosslinked polymer series products, and with its excellent unique properties have been widely used.
PVP is divided into four stages according to its average molecular weight size, which is usually expressed by the K value, and different K values represent the corresponding average molecular weight range of PVP. The K value is actually an eigenvalue related to the relative viscosity of PVP aqueous solution, and the viscosity is a physical quantity related to the molecular weight of polymers, so the average molecular weight of PVP can be characterized by K value. Generally, the greater the K value, the greater the viscosity and the stronger the adhesion.
PVP production polymerization
PVP was obtained by bulk polymerization and solution polymerization of vinyl pyrrolidone (NVP) as raw material. In the process of bulk polymerization, due to the large viscosity of the reaction system, the polymer is not easy to diffuse, and the polymerization heat is not easy to remove, resulting in local overheating and other problems, the obtained product has low molecular weight, high residual monomer content, and is mostly yellow, and has no great practical value. At present, PVP is generally synthesized by solution polymerization in industry.