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

在掺锂离子的多并苯半导体材料中引入了惰性气体，研究<129>了离子浓度对多并苯半导体材料的化学位移的影响。研究了高压氩气对聚苯乙烯（PS）微观结构的影响。[1]多并苯半导体（PAS）材料的结构分析1）在PAS材料中引入氘气，观察<129>了PAS吸附氘气的~ 1HNMR谱。通过分析1HNMR谱对外加压强的依赖关系，得到了样品的平均孔径、平均孔数及其分布; 2）通过二维1HNMR谱研究了样品中1HNMR原子在微孔中的扩散，并<129>通过分析2D-exchange NMR谱研究了样品的孔连通性; 3）对Li-1HNMR样品进行了上述实验研究。观察到的光谱进行了检查，以揭示掺杂的锂离子上的PAS的结构的影响。[2]高压下聚苯乙烯（PS）的研究4）我们采用Pyrex或石英玻璃管作为样品和高压气体的容器，向容器中通入PS和NH_4气体，观察了<129>1HNMR谱。此外，在<13>高压下观察到PS的高分辨率固态~ 13 C NMR谱以及<13>单个碳的~ 13 C弛豫时间。用~ <129>1HNMR和~ 1C <13>NMR研究了不同气体对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.