Structure of advanced engineering plastics as studied by ^<129>Xe NMR

将Xe气体引入到掺杂Li光子的多砷半导体（PAS）材料中，研究了^<129>Xe化学位移与离子浓度的关系。研究了高压Xe气体对聚苯乙烯（PS）微观结构的影响。多砷半导体（PAS）材料的结构分析1)在PAS材料中引入Xe气体，观察到PAS吸附Xe的^<129>Xe核磁共振谱。通过分析Xe核磁共振谱对施加的Xe压力的压力依赖性，得到了平均孔隙大小、孔隙数量及其分布。2)用二维（2D） ^<129>的Xe交换核磁共振（NMR）检测了Xe原子在微孔中的分子扩散。通过分析二维交换核磁共振光谱，研究了微孔的连通性。3)上述实验也对锂掺杂PAS进行了实验。观察到的光谱分析揭示了掺杂Li离子对PAS结构的影响。高压下聚苯乙烯（PS）的研究4)采用高温或石英玻璃管作为样品和高压气体的容器，在容器中引入PS和Xe气体，并观察到^<129>的Xe核磁共振光谱。此外，我们还观察到了高Xe压力下PS的高分辨率固态^<13>C核磁共振光谱，以及单个碳的^<13>C弛豫时间。研究了^<129>Xe和^<13>C NMR结果，以揭示Xe气体对PS微观结构的影响。

Xe gas was introduced into polyacenic semiconductor (PAS) materials doped with Li iopns, and dependence of the ^<129>Xe chemical shife on the ion concentration has been studied. Effects of highly pressurized Xe gas on a micro-structure of polystirene (PS) were also examined.[1]Structural analysis of polyacenic semiconductor (PAS) materials1)Xe gas was introduced into the PAS materials and ^<129>Xe NMR spectra of Xe adsorbed by PAS were observed. The average pore size, number, and its distribution were obtained by analyzing the pressure dependence of the Xe NMR spectra on the applied Xe pressure.2)Molecular diffusion of Xe atoms among the micro-pores was examined by two-dimensional (2D) ^<129>Xe exchange NMR.Conectivities of the micro-pores were studied by analyzing the 2D-exchange NMR spectra.3)Above experiments have also been done for the Li-doped PAS.Observed spectra were examined to reveal effects of the doped Li ions on the structure of PAS.[2]Study of polystirene (PS) under high Xe pressures4)We have developed high-pressure high-resolution solid-state NMR by adopting a Pyrex or quartz glass tube as a container of a sample and highly pressurized gas.PS and Xe gases were introduced to the container, and ^<129>Xe NMR spectra were observed. Further, high-resolution solid-state ^<13>C NMR spectra of PS under high Xe pressure were observed togehter with ^<13>C relaxation times of the individual carbons. The ^<129>Xe and ^<13>C NMR results were examined to unravel effcts of Xe gas on micro-structures of PS.