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聚乙烯醇(PVA)是一种水溶性的高分子,分子链上含有大量羟基,分子主链为反式-左右式平面锯齿形结构,主链上并没有支链,易结晶,其结晶结构为斜方晶系,结晶度很高,可以达到65%至75%,且PVA分子链直径小,分子间作用力强,极性大。文中详解了各种改性机理,并对现有PVA改性的基本类型方式进行了阐述。
Polyvinyl alcohol (PVA) is a water-soluble polymer, the molecular chain contains a large number of hydroxyl groups, the molecular main chain is trans - left and right plane zigzag structure, the main chain is not branched, easy to crystallize, the crystal structure As orthorhombic system, high crystallinity, can reach 65% to 75%, and the PVA molecular chain diameter is small, strong intermolecular force, polarity. In the paper, various modification mechanisms are explained in detail, and the basic types of PVA modification are described.