聚乙烯醇膜材料氚衰变辐照效应研究  

Study on Radiation Effect of Poly(Vinyl Alcohol)Films Irradiated by Tritium Decay

作　　者：李海容[1] 彭述明[1] 周晓松[1] 余铭铭[1] 夏立东[1] 陈晓华[1] 梁建华[1] 

机构地区：[1]中国工程物理研究院核物理与化学研究所,四川绵阳621900

出　　处：《原子能科学技术》2014年第6期1106-1110,共5页Atomic Energy Science and Technology

摘　　要：利用FTIR、XRD、AFM等方法,分析了聚乙烯醇(PVA)膜材料在不同氚气氛下的氚衰变辐照效应,表征了氚衰变β射线对PVA中氢与氚同位素置换的诱导激化作用,明确了PVA中的氚取代主要发生在C—H基团,而醇羟基O—H基团因强烈的氢键作用而未发生氚取代;材料的表面形貌、结晶度等均发生了变化。通过PVA膜拉伸力学性能实验,测定了不同氚衰变辐照下PVA膜材料的拉伸强度和伸长率。结果显示,与其微观结构变化趋势一致。The radiation effect of poly （vinyl alcohol） films used as a kind of gas-barrier material for inertial confinement fusion （ICF） targets was studied under the different conditions of β-ray from tritium decay .The changes of physical and chemical properties of the irradiated material samples were analyzed by FTIR ,XRD and AFM .The tritium-hydrogen isotopic exchange reaction of the irradiated samples mainly occurs at C - H bond and the IR absorption peak of C-T bond obviously increases with the irradiation dose .For strong hydrogen bonding interaction ,the isotopic exchange reaction doesn’t occur at O-H bond .The crystallinity degree and surface morphology of the irradiated samples were changed .The tensile properties of irradiated poly （vinyl alcohol） films were measured by universal material testing machine .The results show that the change trend of mechanical properties is in accordance with the microstructures of the irradiated samples .

关 键 词：聚乙烯醇 氚衰变 辐照效应 

分 类 号：O644.2[理学—物理化学]