GC investigation of post-irradiation oxidation phenomena on polypropylene

IF 0.7 4区物理与天体物理 Q4 CHEMISTRY, INORGANIC & NUCLEAR

Nukleonika Pub Date : 2021-11-25 DOI:10.2478/nuka-2021-0027

W. Głuszewski

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引用次数: 1

Abstract

Abstract The paper summarizes the results of research on gas products of polypropylene (PP) radiolysis. Particular attention was paid to the phenomena of post-radiation degradation of PP. The protective effect of selected aromatic compounds was investigated. The research was carried out both from the point of view of obtaining radiation-resistant PP varieties and the possibility of accelerating biodegradation phenomena, e.g., PP/cellulose composition. The phenomena of post-radiation chain oxidation of PP were investigated by gas chromatography (GC). The GC in the system used (packed column, thermal conductivity detector, argon – carrier gas) enables the determination of H2, O2, CO, and CH4 in one measurement. The samples were irradiated with electron beams (EBs) accelerated in accelerators: Elektronika 10/10 with a power of 10 kW and energy of 10 MeV and LAE 13/9 with a power of 9 kW and energy up to 13 MeV. In the tests, PP without stabilizing additives (obtained directly from the production line) and non-stabilized styrene were used. Radiolytic efficiency of hydrogen evolution allowed us to estimate the number of originally formed free radicals. The maintenance of the secondary oxidation processes was the loss of oxygen and the formation of oxidation products (CO, CH4). Attention is paid to the protective effect of aromatic compounds (polystyrene (PS), polyethylene terephthalate (PET), anthracene, fluoranthene, acenaphthene, pyrene, naphthalene) both at the stage of hydrogen atom separation and the secondary oxidation process. The examples of post-radiation oxidation of PP irradiated in cryogenic conditions (–196°C) are presented. All used aromatic compounds showed a protective effect in PP radiolysis. We suppose that this phenomenon is responsible for the charge transfer along the polymer chain from the ionization spurs to the aromatic compound. The protective ranges of PS in PP radiolysis were estimated for the variously prepared PP/PS type compositions from 6 mers to 28 mers.

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聚丙烯辐照后氧化现象的GC研究

本文综述了聚丙烯（PP）辐解气体产物的研究结果。特别关注了PP的辐射后降解现象。研究了选定的芳香族化合物的保护作用。这项研究是从获得耐辐射PP品种和加速生物降解现象的可能性的角度进行的，例如PP/纤维素组合物。用气相色谱法研究了聚丙烯辐射后链氧化现象。所用系统中的GC（填充柱、热导率检测器、氩气-载气）能够在一次测量中测定H2、O2、CO和CH4。用在加速器中加速的电子束（EB）照射样品：Elektronika 10/10，功率为10kW，能量为10MeV，LAE 13/9，功率为9kW，能量高达13MeV。在试验中，使用了不含稳定添加剂的PP（直接从生产线获得）和未稳定的苯乙烯。氢释放的放射分解效率使我们能够估计最初形成的自由基的数量。二次氧化过程的维持是氧气的损失和氧化产物（CO、CH4）的形成。注意芳香族化合物（聚苯乙烯（PS）、聚对苯二甲酸乙二醇酯（PET）、蒽、荧蒽、苊、芘、萘）在氢原子分离和二次氧化过程中的保护作用。介绍了在低温条件（-196°C）下辐照聚丙烯的辐射后氧化实例。所有使用的芳香族化合物在PP辐解中都显示出保护作用。我们假设这种现象是电荷沿着聚合物链从电离刺向芳香化合物转移的原因。对于不同制备的PP/PS型组合物，估计了PS在PP辐解中的保护范围为6聚体至28聚体。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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来源期刊

Nukleonika 物理-无机化学与核化学

CiteScore

2.00

自引率

0.00%

发文量

审稿时长

4-8 weeks

期刊介绍： "Nukleonika" is an international peer-reviewed, scientific journal publishing original top quality papers on fundamental, experimental, applied and theoretical aspects of nuclear sciences. The fields of research include: radiochemistry, radiation measurements, application of radionuclides in various branches of science and technology, chemistry of f-block elements, radiation chemistry, radiation physics, activation analysis, nuclear medicine, radiobiology, radiation safety, nuclear industrial electronics, environmental protection, radioactive wastes, nuclear technologies in material and process engineering, radioisotope diagnostic methods of engineering objects, nuclear physics, nuclear reactors and nuclear power, reactor physics, nuclear safety, fuel cycle, reactor calculations, nuclear chemical engineering, nuclear fusion, plasma physics etc.