Effects of temperature on the decomposition of PTFE induced by electron beam irradiation

IF 2.8 3区物理与天体物理 Q3 CHEMISTRY, PHYSICAL

Radiation Physics and Chemistry Pub Date : 2025-06-03 DOI:10.1016/j.radphyschem.2025.113029

Hao Yu, Akira Idesaki, Kimio Yoshimura, Yue Zhao, Yasunari Maekawa

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Abstract

The effect of temperature on the irradiation-induced decomposition of polytetrafluoroethylene (PTFE), a representative fluorocarbon polymer, was investigated to improve the energy efficiency of the recycling process. The weight loss of PTFE was 18 %, 33 %, 64 %, and 91 % by the irradiation with a dose of 7.5 MGy (dose rate:1.0 kGy/s) at 30 °C, 120 °C, 200 °C, and 270 °C, respectively. During the electron beam (EB) irradiation of PTFE powders under an oxygen atmosphere, a greater weight loss of PTFE was observed at higher irradiation temperatures. At 370 °C, PTFE powder is completely converted to gaseous components with an absorbed dose of 5.0 MGy; the primary product was identified as an oxidized fluorocarbon (C_nF_2nO_x). A lower dose rate (0.1 kGy/s) reduced the required absorbed dose for PTFE decomposition to 80 % level. Post-irradiation analyses of the PTFE residues using TGA, SEM-EDX, and FT-IR consistently showed that higher irradiation temperatures accelerated the production of oxidized fluorocarbons and further oxidized gaseous products evaporating from the PTFE residue. XRD analysis showed that high-temperature irradiation also increased the crystallite size to 37 ± 5 nm after irradiation at 270 °C, which is nearly double the size of non-irradiated PTFE (21 ± 2 nm). High-temperature irradiation significantly accelerated the oxidation and weight loss of PTFE, offering a promising method for enhancing the energy efficiency of PTFE recycling.

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温度对电子束辐照下聚四氟乙烯分解的影响

为提高聚四氟乙烯回收过程的能效，研究了温度对聚四氟乙烯辐照分解的影响。聚四氟乙烯是典型的氟碳聚合物。在30°C、120°C、200°C和270°C条件下，剂量为7.5 MGy（剂量率1.0 kGy/s）的辐照下，PTFE的失重率分别为18%、33%、64%和91%。在氧气氛下电子束辐照聚四氟乙烯粉末时，辐照温度越高，聚四氟乙烯的失重越大。在370℃时，聚四氟乙烯粉末完全转化为气体组分，吸收剂量为5.0 MGy；主要产品被确定为氧化氟碳（CnF2nOx）。较低的剂量率（0.1 kGy/s）将聚四氟乙烯分解所需的吸收剂量降低到80%的水平。利用热重分析仪、SEM-EDX和FT-IR对聚四氟乙烯残留物进行辐照后分析一致表明，较高的辐照温度加速了氧化氟碳的产生，并进一步从聚四氟乙烯残留物中蒸发氧化气态产物。XRD分析表明，270℃高温辐照后，PTFE的晶粒尺寸增大至37±5 nm，是未辐照时（21±2 nm）的近两倍。高温辐照能显著加速聚四氟乙烯的氧化和失重，为提高聚四氟乙烯的能源利用效率提供了一种很有前途的方法。

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来源期刊

Radiation Physics and Chemistry 化学-核科学技术

CiteScore

5.60

自引率

17.20%

发文量

574

审稿时长

12 weeks

期刊介绍： Radiation Physics and Chemistry is a multidisciplinary journal that provides a medium for publication of substantial and original papers, reviews, and short communications which focus on research and developments involving ionizing radiation in radiation physics, radiation chemistry and radiation processing. The journal aims to publish papers with significance to an international audience, containing substantial novelty and scientific impact. The Editors reserve the rights to reject, with or without external review, papers that do not meet these criteria. This could include papers that are very similar to previous publications, only with changed target substrates, employed materials, analyzed sites and experimental methods, report results without presenting new insights and/or hypothesis testing, or do not focus on the radiation effects.