Polyvinyl Alcohol PVA is one of the common water-soluble polymer. The main molecular chain of it is carbon chain, containing one hydroxyl group per repeating unit. Due to the size of hydroxyl group is small, polarity, is easy to form hydrogen bonds. Therefore, Polyvinyl Alcohol PVA has good property of water-soluble, film-forming, adhesion, emulsification, grease resistance and good solvent resisitance and low toxicity.
Since 1939, the first produced by Dupont, PVA has been widely used in adhesives, paper coating and sizing, textile pulp, pharmaceuticals, food packaging and chemicals. In the last century, the amount of supply and demand in the world has more than 500000 tons/year. As the main pulp and fine and high density synthetic staple fabric warp, PVA has been the most widely used. In warp enhancements, wear-resistant, reducing elongation comprehensive indicators, there have not been any kind of natural or synthetic size can match.
However, Polyvinyl Alcohol PVA’s Achilles’ heel is its non-environmental protection, known as “Unclean Slurry”, some European countries have banned the PVA-containing slurry of imported fabric. And at least a dozen years ago, people searching for a replacement for PVA sizes, but has not yet found the perfect substitute. However, due to the grades of total texitiles and textile products increased, the use of PVA size is increasing each year. This makes the biodegradability of PVA and fate has had a keen interest in ecology.
The use of PVA hydrogel with high water content, like the elastic tissue biocompatibility and relative property, apply PVA to the cells by tissue engineering, for example can be photo-crosslinked poly with degradable and emulsion grafted PVA, reaction in solution may degrade the net work, made on the basis of PVA hydrogel matrix engineered heart valve. These examples can illustrate PVA is relatively safe. However, at the same time, we cannot ignore and evade the PVA is biodegradable, which is the main reasons of why it has been limited.
Since 1939, the first produced by Dupont, PVA has been widely used in adhesives, paper coating and sizing, textile pulp, pharmaceuticals, food packaging and chemicals. In the last century, the amount of supply and demand in the world has more than 500000 tons/year. As the main pulp and fine and high density synthetic staple fabric warp, PVA has been the most widely used. In warp enhancements, wear-resistant, reducing elongation comprehensive indicators, there have not been any kind of natural or synthetic size can match.
However, Polyvinyl Alcohol PVA’s Achilles’ heel is its non-environmental protection, known as “Unclean Slurry”, some European countries have banned the PVA-containing slurry of imported fabric. And at least a dozen years ago, people searching for a replacement for PVA sizes, but has not yet found the perfect substitute. However, due to the grades of total texitiles and textile products increased, the use of PVA size is increasing each year. This makes the biodegradability of PVA and fate has had a keen interest in ecology.
The use of PVA hydrogel with high water content, like the elastic tissue biocompatibility and relative property, apply PVA to the cells by tissue engineering, for example can be photo-crosslinked poly with degradable and emulsion grafted PVA, reaction in solution may degrade the net work, made on the basis of PVA hydrogel matrix engineered heart valve. These examples can illustrate PVA is relatively safe. However, at the same time, we cannot ignore and evade the PVA is biodegradable, which is the main reasons of why it has been limited.