高相对分子量聚丙烯酰胺的分子量很高，一般在（800-2000）万之间，其分子链很长，使其能在两个粒子之间架桥，加速粒子沉降，是很好的絮凝剂。
综述了均聚法和共聚法合成水溶性高分子量聚丙烯酰胺的工艺。
Synthesis of water - soluble high molecular weight polyacrylamide by homopolymerization and copolymerization was introduced.
超高分子量聚丙烯酰胺易发生机械降解、化学降解、热降解反应，造成分子量下降。
Polyacrylamide with ultrahigh molecular weight is easily to degradate such as mechanical, chemical and thermal degradation, it make molecular weight descend.
而超高分子量聚丙烯酰胺经剪切后粘度和粘弹性显著下降，建立流动阻力的能力有限。
But the viscosity and viscoelasticity of ultra high molecular weight polyacrylamide decrease significantly. The ability of establishing flow resistance of polyacrylamide is limited after shearing.
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