pvp polymerization reaction and its application in chemical analysis

Application of PVP in polymerization reaction:
The viscosity and colloidal protection function of PVP make it have important applications in polymerization reactions, especially emulsion polymerization. Adding a small amount of PVP in suspension polymerization can play a role in dispersion stability, thickening and particle size control, such as suspension polymerization of methacrylate and polyamine ester. In the emulsion polymerization system of acrylate and vinyl acetate, appropriate amount of PVP-K60 or PVP and styrene copolymer was added to make the reaction system disperse uniformly and stably, and the viscosity, polymer particle size and particle size distribution could be adjusted by adjusting the molecular weight and dosage of PVP, and some properties of the resin could be improved. When -3%PVPK60 was added to the suspension polymerization of polyaminase, the polymer powder size was uniform, the particle size was between 800-100 microns, and the residual monomer was less than 0.5%. Can be used in coatings, binder, laminate composite materials, made of film, thickness of up to 100 microns, as a coating, coating degree can be as small as 10 microns

In some emulsion polymerization systems, PVP-K15 or PVP-K30 with lower molecular weight can make the reaction more complete, increase the polymerization rate and improve the mechanical properties of the polymer. For example, when PVP-K15 is added as an emulsifier, the polymerization of methyl methacrylate can be completed within half an hour at 50 degrees, and the resulting polymer elastic temperature range is 120-280 degrees, while the polymer elastic temperature range is relatively narrow, 120-150 degrees, without PVP. It also shows that the polymer obtained by using PVP as dispersion stabilizer has good thermal stability.
PVP can be used in analytical chemistry and catalysts:
The aqueous solution of PVP can be divided into liquid-liquid or liquid-solid two phases in the presence of different amounts of (NH4)2S04. This system is used for the extraction separation of metal ions by organic solvents, and a new extraction system can be obtained.
The system has a good extraction effect for some metal ions, such as PVP-(NH4)っS04-H20 system containing PVP20%, using arsine azo (III) as the extraction agent to react with the solution containing Zr(IV), La(III) ions to form a complex, under certain conditions, The chelate of Zr(IV) and arsine azo has a high extraction rate in the PVP phase, while the extraction rate of La(III) is very low, so as to achieve the purpose of separating Zr(IV) and La(III). In addition, PVP and some metals themselves have good complexation, such as PVP and a trace of Cd can be complexed to produce PVP-CD. This property can be used to successfully detect trace amounts of cadmium. In addition, related studies have reported that for methanol gas phase carbonylation, the activity and selectivity of carbon-supported collolawrencium catalyst (PVP-RH /C) is much higher than that of simple carbon-supported rhodium catalyst, because the lawrencium collolawrencium catalyst formed with PVP has narrow particle size distribution, high dispersion and larger specific surface area. The selectivity of the reaction was improved as well as the catalytic activity.