超高分子量聚乙烯的辐照效应

通过密度测定和ＤＳＣ热分析，观测了超高分子量聚乙烯的辐射效应。实验结果表明：在吸收剂量０—１．１３ＭＧｙ范围内，密度随吸收剂量的增加而增大，熔化热和熔点也有所增加，特别是在低剂量范围内增加十分明显。以上结果都说明，超高分子量聚乙烯在辐照过程中，结晶在完善或有新的结晶形成

RADIATION EFFECT ON ULTRAHIGH MOLECULAR WEIGHT POLYETHYLENE

Ultrahigh molecular weight polyethylene (UHMWPE) can be used at a substitute of the bone of human body sketelon.Before being set in to human body,it needs to be sterilized with high energy radiation.Therefore,it is of considerable significance to study the effect of radiation on UHMWPE.Because of ultrahigh molecular weight of this material,there would be a lot of entanglements at molecular chain,its radiation effect would be quite different from that of polyethylene with normal molecular weight.The radiation effect on UHMWPE was studied by means of density and DSC analysis,It has been shown that the density increases with the increase of radiation dose up to 1 13 MGy monotonically.The heat of fusion per unit weight of sample and melting point of UHMWPE increase with dose too,especially at the lower dose of radiation.It could be concluded that during the period of radiation,there would be additional crystallization or crystal perfection taken place.