Abstract

A novel calorimetry system is presented to use in radiation processing facilities equipped with an electron accelerator. The calorimeter core was fabricated with polystyrene/multiwall carbon nanotube nanocomposite. The nanocomposite samples were made in different weight percentages of MWCNTs namely 0.05, 0.1, 0.28, 1, and 2 wt %. The SEM analysis was applied to demonstrate the dispersion state of the inclusions into the polymer matrix. The electrical percolation threshold was investigated and achieved at about 0.1 wt % of the inclusion. The electrical resistance of the samples was objected as the calorimeter response before and after the electron beam irradiation. A linear response of the resistance-dose curve was observed for all the nanocomposites having the 0.1 and 0.28 wt % of the inclusion at a dose range of ~8 to ~40 kGy. The results showed that the decrease of the MWCNT content leads to increasing the electrical resistance. Furthermore, the thicker sample showed better experimental results in comparison to the thinners. The best results were obtained for the nanocomposite sample containing 0.14 wt % of MWCNT and 5 mm of sample thickness.

中文翻译：

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基于聚苯乙烯/ MWCNT纳米复合材料的量热系统电子束剂量学：一种新方法

摘要

提出了一种新颖的量热系统，用于配备电子加速器的辐射处理设备。用聚苯乙烯/多壁碳纳米管纳米复合材料制造量热仪芯。纳米复合材料样品以不同重量百分比的MWCNT制备，即0.05、0.1、0.28、1和2wt％。应用SEM分析来证明夹杂物在聚合物基质中的分散状态。研究了电渗流阈值，并在夹杂物的约0.1wt％处达到了。样品的电阻以电子束照射前后的量热计响应为对象。在〜8至〜40kGy的剂量范围内，对于所有具有0.1和0.28wt％的夹杂物的纳米复合材料，观察到电阻-剂量曲线的线性响应。结果表明，MWCNT含量的减少导致电阻的增加。此外，与较薄的样品相比，较厚的样品显示出更好的实验结果。对于包含0.14 wt％MWCNT和5 mm样品厚度的纳米复合材料样品，可获得最佳结果。