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Polyvinyl alcohol (PVA) preparation method

 Last Update: 2021-10-21
 Source: Internet
 Author: User

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Polyvinyl Alcohol (PVA)

[Structural formula]

[Preparation method] Polyvinyl alcohol is a white, powdery resin, obtained by hydrolyzing vinyl acetate
.
Due to the large number of hydroxyl groups in the molecular chain, polyvinyl alcohol has good water solubility

The specific process is as follows
.
①The polymerization of vinyl acetate usually adopts the solution polymerization method.
After the vinyl acetate is preheated, it is mixed with a solvent (such as methanol, etc.

) and an initiator (such as azobisisobutyronitrile, etc.
), and then sent to two series polymerization kettles.

Polyacrylamide and polyethylene oxide graft copolymer

[Preparation method] Deng Yulin and others of McMaster University in Canada used polyacrylamide and polyethylene oxide as raw materials to prepare a graft copolymer of polyacrylamide and polyethylene oxide through gamma radiation
.
Specific process: Dissolve polyacrylamide with a mass fraction of 1.

16% (relative molecular mass of 5×10 ⁶ ) and polyoxyethylene with a mass fraction of 1.

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