熱劣化架橋ポリエチレンシートの微細構造変化の評価

カテゴリ: 論文誌(論文単位)

グループ名: 【A】基礎・材料・共通部門

発行日: 2011/07/01

タイトル(英語): Evaluation of Microscopic Structural Changes of XLPE Sheets due to Thermal Deterioration

著者名: 栗原　隆史（(財) 電力中央研究所 電力技術研究所），高橋　俊裕（(財) 電力中央研究所 電力技術研究所），土肥　謙次（(財) 電力中央研究所 材料科学研究所），本間　宏也（(財) 電力中央研究所 電力技術研究所），岡本　達希（(財) 電力中央研究所 電力技術研究所）

著者名(英語): Takashi Kurihara (Electric Power Engineering Research Lab., CRIEPI), Toshihiro Takahashi (Electric Power Engineering Research Lab., CRIEPI), Kenji Dohi (Materials Science Research Lab., CRIEPI), Hiroya Homma (Electric Power Engineering Research Lab., CRIEPI), Tatsuki Okamoto (Electric Power Engineering Research Lab., CRIEPI)

キーワード: 原子力発電所，架橋ポリエチレン，酸化，微細構造，陽電子消滅，自由体積　　nuclear power plants，XLPE，oxidation，microscopic structure，positron annihilation，free volume

要約(英語): Cross-linked polyethylene (XLPE) sheets were thermally deteriorated in atmospheric air at 180℃ for at most 100 hours, and microscopic structural changes due to oxidation such as material density, crystallinity, gel fraction and free volumes were evaluated by the Archimedes' technique, the X-ray diffraction method, the gel fraction measurement and the positron annihilation technique, respectively. As a result, it was found that the crystallinity and free volumes decreased after about 40 hours of heating on the upper surface of XLPE sheets where air supply was sufficient during heating and oxidation degree was high. However, on the lower surface that contacted with a metal plate during heating and was less oxidized, changes of crystallinity and free volumes were small after 40 hours of heating. When the crystallinity and free volumes decreased, the material density increased. It was also found that the gel fraction increased at 100 hours of heating. The observation results of cross-sections of XLPE sheets by the transmission electron microscope showed that lamella crystals disappeared after 40 hours of heating especially near the upper surface of XLPE sheets and agree with the change of the crystallinity. Then, the relationships between the material density, the crystallinity and free volumes in the cases of crystalline polymers such as polyethylene without deterioration and XLPE thermally deteriorated at 180℃ were discussed.

本誌: 電気学会論文誌A（基礎・材料・共通部門誌） Vol.131 No.7 （2011） 特集：高周波マイクロ磁気応用技術の最前線

本誌掲載ページ: 560-566 p

原稿種別: 論文／日本語

電子版へのリンク: https://www.jstage.jst.go.jp/article/ieejfms/131/7/131_7_560/_article/-char/ja/