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how to make polyvinyl alcohol?

Number of visits: Date:2014年11月3日 13:24

polyvinyl alcohol 

 
Unlike most vinyl polymers, PVA is not prepared by polymerization of the corresponding monomer. The monomer, vinyl alcohol, is unstable with respect to acetaldehyde. PVA instead is prepared by first polymerizing vinyl acetate, and the resulting polyvinylacetate is converted to the PVA.Other precursor polymers are sometimes used, with formate, chloroacetate groups instead of acetate. The conversion of the polyesters is usually conducted by base-catalysed transesterification with ethanol:
 
[CH2CH(OAc)]n + C2H5OH → [CH2CH(OH)]n + C2H5OAc
The properties of the polymer depend on the amount of residual ester groups.
 
Worldwide consumption of polyvinyl alcohol was over one million metric tons in 2006.Larger producers include Kuraray (Japan and Europe) and Sekisui Specialty Chemicals (USA) but mainland China has installed a number of very large production facilities in the past decade and currently accounts for 45% of world capacity. The North Korean-manufacture fiber Vinalon is produced from polyvinyl alcohol. Despite its inferior properties as a clothing fiber, it is produced for self-sufficiency reasons, because no oil is required to produce it.

TypeInfo: Industry News

Keywords for the information:polyvinyl alcohol 

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