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A comparative study on degradation characteristics of fluoropolymers irradiated by high energy heavy ions

机译：高能重离子辐照含氟聚合物降解特性的比较研究

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摘要

Energetic heavy ions passing through polymer foils cause modifications of properties, first of all structural changes. In order to evaluate ion beam modification of fluoropolymers, a comparison of polyvinylidene fluoride (PVDF), ethylene-tetrafluoroethylene (ETFE), tetrafluoroethylene-per-fluoromethoxyethylene (PFA), and tetrafluoroethylene-hexa-fluoropropylene (FEP) was undertaken. Foils were irradiated with heavy ions (Sm, Au) of a kinetic energy of a few MeV u(-1) and fluences up to 6 x 10(12) ions cm(-2) at room temperature in vacuum. The ion induced changes in the molecular structure were studied with Fourier transform infrared spectroscopy (FT-IR) and on-line mass spectrometry (Residual Gas Analysis, RGA). The results in terms of macromolecular changes and formation of fragments were compared and related to the individual polymer structures. In general, the polymers lose various small molecular fragments by bond scission of polymeric backbone and side chains, typically fluorine and hydrogen fluoride, as well as trifluoromethyl, and form new bonds, mainly CC double bonds. From the results, the main degradation reactions are derived. The findings are of technical interest for space applications when devices are hit by highly energetic heavy ions from galactic cosmic rays on long-term missions.
机译：穿过聚合物箔的高能重离子会导致性能改变，首先是结构变化。为了评估含氟聚合物的离子束改性，对聚偏二氟乙烯（PVDF），乙烯-四氟乙烯（ETFE），四氟乙烯-全氟甲氧基乙烯（PFA）和四氟乙烯-六氟丙烯（FEP）进行了比较。箔在室温下用动能为几个MeV u（-1）的重离子（Sm，Au）辐照，并且在室温下通量达6 x 10（12）cm（-2）离子。用傅里叶变换红外光谱（FT-IR）和在线质谱（残留气体分析，RGA）研究了离子诱导的分子结构变化。比较了大分子变化和片段形成方面的结果，并将其与单个聚合物结构相关。通常，聚合物通过聚合物主链和侧链（通常为氟和氟化氢以及三氟甲基）的键断裂而损失各种小分子片段，并形成新的键，主要是CC双键。从结果可以得出主要的降解反应。当设备在长期任务中受到来自银河宇宙射线的高能重离子撞击时，这一发现对于太空应用具有技术意义。

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