Study On Structure And Properties Of High Strength And High Modulus Poly (Vinyl Alcohol) Fiber Prepared By Melt Spinning

Poly(vinyl alcohol) (PVA) is a multi-hydroxyl polymer, which can be prepared from natural gas, thus becomes more and more important in the situation of petroleum scarcity. PVA fibers have potential use in high technology field due to its high strength, excellent thermal properties, abrasion resistance, antialkaline resistance and compatibility with many other polar materials. The multi-hydroxyl in PVA makes it has many intra- and intermolecular hydrogen bonds, resulting in its melting point close to its decomposition temperature and its thermal processing very difficult. Therefore, PVA fibers are usually produced by wet spinning. However, the two-direction mass transfer of wet spinning makes the cross profile of filament like a kidney and have the obviously skin-core structure, which is disadvantage for the high drawing. PVA fibers obtained from wet spinning can only be drawn to 6 or 7 times and the strength is very low, i.e. 5-8cN/dtex. Simultaneously, this method has complicated process and heavy pollution. Realization of melt spinning would be surely a great progress in the production of high performance PVA fiber.Aiming at the key issue of PVA fiber industry, this paper focuses on the realization of PVA melt spinning through intermolecular complexation and plasticization, and studies its mechanism. According to the supermolecular...