| 变温条件下HDPE/CB的正电子湮灭特性 |
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| 引用本文： | 贾少晋,张志成,范扬眉,张宪峰,韩容典,都志文,翁惠民.变温条件下HDPE/CB的正电子湮灭特性[J].功能材料,2002,33(3):335-337,340. |
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| 作者姓名： | 贾少晋 张志成 范扬眉 张宪峰 韩容典 都志文 翁惠民 |
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| 作者单位： | 1. 中国科学技术大学,应用化学系,安徽,合肥,230026
2. 中国科学技术大学,近代物理系,安徽,合肥,230026 |
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| 摘 要： | 对掺杂了25份（phr）导电炭黑（CB）的样品进行了正电子湮灭寿命谱的变温测量，在玻璃化转变温度以上，随着温度的增加，自由体积的大小线性增加，在玻璃化转变温度以下，自由体积的大小基本不变，o-Ps的强度在－40℃下基本不变，从－40℃以上开始增加，但在50℃以上上升有加快的趋势，与PTC材料的PTC现象和导电性能有一定的关联。
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| 关 键 词： | HDPE／CB 正电子湮灭 炭黑 PTC 自由体积 |
| 文章编号： | 1001-9731(2002)03-0335-03 |
Study of the size, numerical concentration and size distribution of free volume of carbon filled HDPE composites |
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| JIA Shao jin ,ZHANG Zhi cheng ,FAN Yang mei ,ZHANG Xian feng ,HAN Rong dian ,DU Zhi wen ,WENG Hui min.Study of the size, numerical concentration and size distribution of free volume of carbon filled HDPE composites[J].Journal of Functional Materials,2002,33(3):335-337,340. |
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| Authors: | JIA Shao jin ZHANG Zhi cheng FAN Yang mei ZHANG Xian feng HAN Rong dian DU Zhi wen WENG Hui min |
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| Affiliation: | JIA Shao jin 1,ZHANG Zhi cheng 1,FAN Yang mei 2,ZHANG Xian feng 2,HAN Rong dian 2,DU Zhi wen 1,WENG Hui min 2 |
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| Abstract: | The size and numerical concentration of free volume of HDPE/CB composites were estimated by means of positron annihilation lifetime measurement, in which annihilations of positron and positronium were assessed. From the variation of the ortho positronium (o Ps) lifetimes with the changes of temperature,we find that temperature dependence of positron lifetimes reveals that the existence of glass transition temperatures and size of free volume increases when temperature increases above glass transition . It was likely to test that PTC was probably closely related to hole size and therefore, conductivity may be deduced by the number of holes and the hole size. |
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| Keywords: | positron annihilation CB PTC free volume |
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