Polyvinyl alcohol dialdehyde

Microgels can not only be synthesized by polymerization but also by polycondensation or polyaddition [350]. In an early work on crosslinking of single linear macromolecules, it could be shown that if a crosslinking agent, such as terephthal dialdehyde, was added to a very dilute solution of a linear polymer such as polyvinyl alcohol, almost exclusively a intramolecular crosslinking of the individual macromolecules took place [351]. 

Pervaporation (PV) membranes were developed for the dehydration of ethanol and other organic solvents. Therefore, the dense selective layer is made of polyvinyl alcohol, which is one of the most hydrophilic materials (see Table 2). Water is preferentially sorbed to polyvinyl alcohol and also preferentially transported. To suppress the excessive swelling of polymer in water, polyvinyl alcohol is partially cross-linked by dialdehydes such as glutaraldehyde. ... 

The senativity of polyvinyl alcohol films and molded or esctruded articles to the dissolving action of water decreases their usefulness for some applications. In order to render the pols vinyl alcohd less soluble or even insoluble in water, it can be treated with formaldehyde or tanning agents, ferric chloride, chromate and bichromates, and cuprammonium hydroxide. i For the same purpose, it can also be reacted with (hbasic acids, dialdehydes, and dimethylolurea. ... 

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