Polyvinyl Pyrrolidone has different solubility in different solvents,that is ,the extensive scope of variation
In the table below, the solvents under the column of "Soluble" means that a satured solution of the polymer contains a mass fraction of at least 10%, while "Insoluble" means that the mass fraction of PVP of a satured solution is less than 1%.
Soluble
Soluble
Soluble
Insoluble
Insoluble
Chloroform
Isopropyl Alcohol
Normal Propyl Alcohol
Cyclohexane
Pentane
Cyclohexanol
Methyl Alcohol
Polyethylene Glycol
Ethyl Ether
Carbon Tetrachloride
Absolute Alcohol
Methylene Chloride
Propylene Glycol
Acetone
Toluene
Glycerin
Normal Butyl Alcohol
Triethanolmine
Liquid Paraffin
Dimethylbenzene
2.Molecular Weight
Molecular weight of polymer is generally expressed as weight average(Mw), number average and viscosity average. The most commonly used expression is weight average molecular weight, which is measured by light scattering method. Mw Values of PVP-K series products are shown as following:
PVP-K12
PVP-K17
2,000-------------------3,000
7,000--------------1,1000
PVP-K25
28,000-----------------34,000
PVP-K30
44,000-----------------54,000
PVP-K60
320,000---------------380,000
PVP-K90
1,000,000-----------1,500,000
PVP-K120
1,600,000-----------2,000,000
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