机械降解，造成有缺陷的设备或磁带坚持，老化或有缺陷的存储。
Mechanical degradation caused by defective devices or sticking tapes, by aging or defective storage.
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.
结论：从材料的机械性能和降解性能上看，壳聚糖膜基本符合用于引导组织再生的要求。
Conclusion: From the point of view of mechanical strength and degradation performance, Chitosan membrane meet the requirements of guided tissue regeneration.
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