The widespread application of polyvinyl alcohol in various industries benefits from its many excellent properties, such as:
1. Solubility: PVA powder can be dissolved in water. The PVA resin with an alcoholysis degree of less than 95% can be dissolved in room temperature water, and another one with an alcoholysis degree of more than 99.5% can only be dissolved in hot water above 95℃.
2. Thermal stability: Polyvinyl alcohol softens when heated and does not change significantly below 40℃. Glass transition temperature: 75~85℃. It slowly changes color and becomes brittle when heated to above 100℃. Above 160℃, long-term heating will gradually color, dehydrate, etherify, and lose solubility; above 220℃, it will decompose to generate water, acetic acid, acetaldehyde, and crotonaldehyde; above 250℃, it will become containing conjugated double bonds polymer.
3. Chemical resistance: PVA is almost unaffected by weak acids, weak bases or organic solvents, and has high oil resistance.
4. Storage stability: PVA is a low-viscosity polymer, and its aqueous solution is very stable at room temperature. The aqueous solution will not deteriorate during storage.
5. Film-forming properties: Due to the high adhesion between PVA molecules, PVA is easy to form films. The formed film is colorless and transparent, has good mechanical strength, has a smooth surface without being sticky, and has good solvent resistance. The molecular film has good light transmittance, high moisture permeability, is uncharged, does not absorb dust, and has good printability.
6. Chemical properties: PVA is almost unaffected by weak acids, weak bases or organic solvents, and has high oil resistance. It can be regarded as a linear polymer with secondary hydroxyl groups. The hydroxyl group in the molecule has high activity and can carry out typical chemical reactions of low alcohols, such as esterification, etherification, acetalization, etc., and can also react with many inorganic compounds or organic compounds.
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