Elucidation of degradation mechanism of polymers in thermal oxidation and gamma-ray irradiation by luminescence spectroscopy

2018 Fiscal Year Final Research Report

• Project/Area Number: 16K05644
• Research Category: Grant-in-Aid for Scientific Research (C)
• Allocation Type: Multi-year Fund
• Section: 一般
• Research Field: Physical chemistry
• Research Institution: Tokyo University of Agriculture and Technology
• Principal Investigator: NAKATA MUNETAKA 東京農工大学, (連合)農学研究科(研究院), 教授 (40143367)
• Project Period (FY): 2016-04-01 – 2019-03-31
• Keywords: ルミネッセンス分光法 / 熱酸化劣化 / 放射線劣化 / 放射線履歴検知

Outline of Final Research Achievements

Ultraweak chemiluminescence from organic and inorganic polymers during heating was measured as spectrum with a multichannel Fourier-transform chemiluminescence spectrometer. By joint use of matrix-isolation infrared spectroscopy, UV-visible spectroscopy, and thermal analysis, the following research projects were performed: (1) Elucidation of gamma-ray irradiation degradation mechanism of polytetrafluoroethylene to produce peroxy radical; (2) elucidation of thermal oxidative degradation mechanism of cross-linking agents to be used in production of elastomers; (3) consideration of possibility of a detection method of gamma-ray irradiation history by thermoluminescence spectroscopy.

Free Research Field

物理化学

Academic Significance and Societal Importance of the Research Achievements

新しく開発された発光分光分析装置で，物質から放射される極微弱な光を検出した．この装置の特色は発光の強度だけではなく，発光の種類も区別できることである．とくに，放射線を照射した有機高分子（ポリエチレンなど）や，無機高分子（カキやホタテなどの貝殻）からの発光を丁寧に分析して，どのくらいの放射線が照射されたかを調べた．前処理することのない簡易な放射線量の測定法を提案した．