γ 辐照及热处理对拉伸高密度聚乙烯结晶度的影响  

EFFECTS OF γ-IRRADIATION AND THERMAL TREATMENT ON CRYSTALLINITY OF DRAWN HDPE

作　　者：刘占军[1] 

机构地区：[1]中国科学技术大学应用化学系

出　　处：《辐射研究与辐射工艺学报》1997年第2期91-95,共5页Journal of Radiation Research and Radiation Processing

摘　　要：研究了在真空和空气中γ辐照对拉伸高密度聚乙烯（ＨＤＰＥ）结晶度的影响。结果表明：真空中辐照约２５０ｋＧｙ吸收剂量，拉伸ＨＤＰＥ的结晶度随吸收剂量的增加而降低，然后吸收剂量的增加对其结晶度基本上无影响；而在空气中辐照至１０００ｋＧｙ的吸收剂量，拉伸ＨＤＰＥ的结晶度基本保持不变。同时还研究了不同温度热处理对未辐照拉伸ＨＤＰＥ的结晶度影响，其结晶度首先随热处理温度的增加而迅速增加，约１２０°Ｃ时达到极大值。而后随热处理温度的进一步增加而迅速下降。由拉伸ＨＤＰＥ中存在大量空隙及结晶缺陷和聚乙烯的辐射化学反应解释了上述实验结果。The effect of absorbed dose irradiated in vacuum and air on the crystallinity of drawn HDPE was studied. Experimental results show that up to 250kGy of absorbed dose when irradiated in vacuum, the crystallinity of drawn HDPE is decreased from about 75% to about 71%, and then the increase of absorbed dose until 1000kGy has no further effect in lowering thecrystallinity; when irradiated in air, an absorbed dose of 1000kGy has noeffect on the crystallinity of drawn HDPE. The effect of temperature of thermal treatment on the crystallinity of unirradiated drawn HDPE was alsoinvestigated. At first, the crystallinity is increased with the increase oftemperature of thermal treatment, at about 120℃, it reaches the maximumvalue, and then it is repidly lowered with the further increase of temperatureof thermal treatment. Based on the existence of a lot of voids and latticedefects inside the drawn HDPE, the above experimental results were explained.

关 键 词：Γ辐照 高密度 聚乙烯 拉伸 热处理 结晶度 

分 类 号：O632.12[理学—高分子化学] O631.34[理学—化学]