Abstract

A combination of a long exposure to ultraviolet (UV) radiation and the extraction of radiolysis and photolysis products from tracks makes it possible to create ion-selective membranes from polyethylene terephthalate (PET) films irradiated with heavy ions. These membranes exhibit high selectivity for singly charged cations and high transport characteristics in the electrodialysis mode. The aim of this study is to analyze the mechanisms of the transformation of latent tracks into a system of through pores of the subnanometer range in more detail. Polyethylene terephthalate films are irradiated with accelerated Xe and Bi ions with energy losses in the polymer of 11 and 18 keV/nm, respectively. The evolution of the free volume and the accumulation of carboxyl groups in the irradiated films at different stages of the treatment are studied using gravimetry, IR and UV spectroscopy, conductometry, and electron microscopy methods. It is found that the properties of the resulting membranes depend on several critical parameters, which include, in addition to temperature during extraction, the energy loss of the bombarding ion, the pH of the solution used for extraction, and ion fluence. Dramatic changes in the membrane properties are observed at ion fluences at which individual tracks begin to overlap.

中文翻译：

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从重离子辐照的聚对苯二甲酸乙二醇酯薄膜中创建离子选择膜：工艺的关键参数

摘要

长时间暴露于紫外线（UV）以及从轨道中提取辐射分解和光解产物的组合，使得从重离子辐照的聚对苯二甲酸乙二酯（PET）薄膜上形成离子选择性膜成为可能。这些膜对单电荷阳离子具有高选择性，并且在电渗析模式下具有高传输特性。这项研究的目的是更详细地分析潜迹转变成亚纳米范围的通孔系统的机制。用加速的Xe和Bi离子辐照聚对苯二甲酸乙二酯薄膜，聚合物中的能量损失分别为11和18 keV / nm。使用重量分析法，红外光谱和紫外光谱法，电导法和电子显微镜方法研究了在不同处理阶段的辐照膜中自由体积的演变和羧基的积累。已经发现，所得膜的性能取决于几个关键参数，除了萃取过程中的温度外，还包括轰击离子的能量损失，用于萃取的溶液的pH值和离子通量。在各个迹线开始重叠的离子注量处，膜性能发生了巨大变化。轰击离子的能量损失，用于萃取的溶液的pH值和离子通量。在各个迹线开始重叠的离子注量处，膜性能发生了巨大变化。轰击离子的能量损失，用于萃取的溶液的pH值和离子通量。在各个迹线开始重叠的离子注量处，膜性能发生了巨大变化。