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

在掺杂锂离子的聚并苯半导体(PAS)材料中引入Xe气体，研究了掺杂离子浓度对PAS材料化学位移的影响。研究了高压Xe气体对聚苯乙烯(PS)微结构的影响。[1]对聚并苯半导体(PAS)材料进行了结构分析。1)在PAS材料中引入Xe气体，观察到PAS吸附Xe的核磁共振谱。通过分析Xe核磁共振谱对压力的依赖关系，得到了Xe原子在微孔中的平均孔径、孔数及其分布。2)用二维(2D)方法研究了Xe原子在微孔中的分子扩散。3)对掺锂聚苯乙烯(PAS)进行了上述实验，考察了Li离子掺杂对PAS结构的影响。[2)高Xe压力下聚苯乙烯(PS)的研究4)我们采用高温高压或石英玻璃管作为样品的容器，并引入高压气体，研制了高压高分辨率固态核磁共振装置。此外，还观察到了PS在高Xe压力下的高分辨固态~(13)&gt；C核磁共振谱和单个碳的~(？)lt；13&gt；C弛豫时间。考察了~&lt；129&gt；Xe和^&lt；13&gt；C核磁共振结果，揭示了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.