NMR Imaging and Solid State High Resolution NMR Studies of Materials ; Properties and Internal Structural Changes in Materials.

在本研究中，利用核磁共振成像和固体高分辨核磁共振方法为材料科学开辟了一条新的途径。利用核磁共振成像技术作为一种无创性的、连续的分析材料内部结构变化的方法，在以下四个研究项目中获得了新的信息：1)无定形硅酸铝在焙烧过程中的结构变化：(1)提出了将无定形硅酸铝直接转化为莫来石作为莫来石的前驱体。(2)莫来石前驱体由无定形结构转变为红柱石结构，最终转变为莫来石结构。(3)碱金属(Li，Na，K)离子对莫来石形成过程的影响。2)研究了溶剂在聚碳酸酯和聚甲基丙烯酸甲酯在丙酮、二甲基亚砜、二甲基甲酰胺和水中的扩散过程。3)插层粘土矿物：用ESR研究了DPPH在钠基蒙脱石和皂石层间的吸附情况。5)五配位铝络合物的稳定性：在铝硅酸盐的焙烧过程中发现了铝离子配位化学中较少的五配位铝络合物。铝络合物的核磁共振研究也计划另外进行。

In the present investigation, a new approach in material sciences has been done by using NMR imaging and solid state high resolution NMR methods. NMR imaging technique was used as an invasively, and continuously analysing method of the internal structural changes of materials.New informations in the following four research projects were obtained ;1)The structural change of amorphous aluminosilicates in the process of calcination : (1)Amorphous aluminosilicate which was directly changed into mullite was proposed as the mullite precursor. (2)The mullite precursor changes from amorphous to andulsite-like structure and finally into mullite. (3)Alkaline metal(Li, Na, K)ions affect the mullite formation process.2)Imaging of diffusion processes of solvent in polymers : Polycarbonate and PMMA in aceton, DMSO, DMF and water were investigated. The swelling rate of solvent or the rate of solubility were determined.3)Intercalation into clay minerals : The adsorption of DPPH in the interlayer of sodium montmorillonite and saponite was investigated by ESR. The intercalation mechanism seemed to be different between them because of the distinction of expandability.4)Stability of five-coordinated Aluminium complexes : 5-coordinated AI complex, which is few in coordination chemistry of AI ion, was found in the calcinating process of aluminosilicates. NMR study of Aluminum complexes was planned additionally.