A Pulsed Slow Positron Beam Apparatus and its Application to Thin Polymer Films

脉冲慢正电子束装置及其在聚合物薄膜中的应用

• 批准号: 12555270
• 负责人: SUZUKI Takenori
• 金额: $ 5.18万
• 依托单位: High Energy Accelerator Research Organization
• 依托单位国家: 日本
• 项目类别: Grant-in-Aid for Scientific Research (B)
• 财政年份: 2000
• 资助国家: 日本
• 起止时间: 2000 至 2002
• 项目状态: 已结题
• 来源: https://kaken.nii.ac.jp/en/grant/KAKENHI-PROJECT-12555270/
• 关键词: positron annihilation; pulsed beam; radio isotopes; slow positron; polymer; surface; thin film; free volume; Low K film; パルス化

In order to study the surface of polymers, a pulsed slow positron beam (PSPB) is necessary to determine the injection time in the investigated polymer. Commonly PSPB is made using a linear accelerator, which need large facility. In this project, a small apparatus desk-top size has been built using radio isotopes. The bunched and pulsing beam was obtained by the RF method, in which RF field is applied on a Al tube with 2cm diameter and 5cm length. The length is determined by the flight time of positions through the tube. Thus 40 MHz RF is used to bunch the rundum beam to a bunched beam. The width is 500 to 600ps, which is enough to study polymer samples, which have lifetimes longer than 1.5ns to 2 ns. In order to get a beam with 300pswidth, it is required another main buncher.In this project, the apparatus to obtain a pulsed and bunched beam has been successfully built and applied to measure lifetimes of polymers : polyethylene, epoxy resin, epoxy composite, epoxy coated films on a Silicon metal.In this application, the heat expansion coefficient of the surface and the bulk of epoxy resin was obtained. The increase in the positronium formation with increasing the depth was observed in polyethylene. The skin layer of the composite materials was observed by a non destructive method. Low K films on Silicon plate, which are extensively used in 1C and electric industry has been studied. Large holes with about 50 ns positron lifetime hasbeen successfully observed

为了研究聚合物的表面，脉冲慢正电子束（PSPB）是必要的，以确定在所研究的聚合物的注入时间。通常的PSPB是用直线加速器来实现的，这需要很大的设备。在这个项目中，已经使用放射性同位素建造了一个桌面大小的小型仪器。采用射频方法，在直径为2cm、长为5cm的铝管上施加射频场，获得了脉冲聚束光束。长度由位置通过管的飞行时间决定。因此，40 MHz RF用于将rundum波束聚束成聚束波束。宽度为500至600 ps，足以研究寿命长于1.5 ns至2 ns的聚合物样品。为了获得300ps宽的光束，需要另一个主聚束器，在本项目中，成功地建立了获得脉冲和聚束的装置，并应用于测量聚合物：聚乙烯，环氧树脂，环氧复合材料，硅金属上的环氧涂层的寿命，在这个应用中，获得了表面和体积的环氧树脂的热膨胀系数。在聚乙烯中观察到随着深度的增加，正电子素形成的增加。用非破坏性方法观察了复合材料的表层。研究了在集成电路和电子工业中广泛应用的硅基低K薄膜。成功地观察到了正电子寿命约为50ns的大空穴

项目成果

Shantarovich, 鈴木健訓, 他: "Inhibition of positronium formation by polar groups in polymers-relation with TSL exp."Radiation Physics and Chemistry. 67. 15-23 (2003)

Shantarovich、Takenori Suzuki 等人：“聚合物中极性基团对正电子素形成的抑制 - 与 TSL 实验的关系。”辐射物理与化学 67. 15-23 (2003)

熊木, 鈴木, 何春清, 陶: "低速陽電子短パルス化装置を用いた表面自由体積の研究"ネットワークポリマー. 23. 24-31 (2002)

熊木、铃木、何春清、陶：“利用慢速正电子短脉冲发生器的表面自由体积研究”网络聚合物23。24-31。

He, C.Q., Suzuki, T., Kondo, +2 authors: "Positron annihilation in hypercrosslinked polysltylenes"Chemical Physics. 286. 249-256 (2003)

He, C.Q.、Suzuki, T.、Kondo，2 位作者：“超交联聚苯乙烯中的正电子湮灭”化学物理。

Shantarovich, V., Suzuki, T., +6 authors: "Positron annihilation study of hyper-cross-linked polystylene networks"Macromolecule. 35. 9723-9729 (2002)

Shantarovich，V.，Suzuki，T.，6作者：“超交联聚苯乙烯网络的正电子湮灭研究”大分子。

Matsuo M., Ma Lin, Suzuki T., 0 authors: "Characteristics of ultra-drawn polyethylene films as a function of temperature estimated by the positr on annihilation lifetime method"Macromolecules. 35. 3059-3065 (2002)

Matsuo M.、Ma Lin、Suzuki T.，0 位作者：“通过正湮没寿命法估计的超拉伸聚乙烯薄膜随温度变化的特性”大分子。