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.
近些年来，超高分子量聚丙烯酰胺由于其在絮凝方面的优良性能正逐渐受到人们的重视。
In recent years, the ultrahigh molecular weight polyacrylamide is being paid more attention because of its good capability of flocculation.
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