Development of a NMR Probe for the Super-High Magnetic-Field Gradient Spin-Echo and its Application to Polymer Systems

超高磁场梯度自旋回波核磁共振探针的研制及其在聚合物体系中的应用

基本信息

批准号：
01850196
负责人：
NOSE Takuhei
金额：
$ 7.04万
依托单位：
Tokyo Institute of Technology
依托单位国家：
日本
项目类别：
Grant-in-Aid for Developmental Scientific Research (B).
财政年份：
1989
资助国家：
日本
起止时间：
1989 至 1990
项目状态：
已结题

项目摘要

1. Development of a NMR probe for the super-high magnetic-field gradient spinecho (FGSE-NMR)(1) We have succeeded in construction of the probe with following specifications.Maximum of magnetic-field gradient 600G/cmSample size diameter 5mm x length 8mmPulse width 0.03-50msPulse interval 5-600msGenerated magnetic-field gradient was calibrated against applied electric current, and reliability of the measurement was confirmed. Available ranges of pulse-width and pulse-interval were determined by taking the effect of residual magnetic field into account. The maximum gradient attained here is the highest in reported values in the polymer field.2. Application to polymer systemsApplicability of the FGSE-NMR method with this probe was demonstrated through the following experimental studies on polymer dynamics.(1) Diffusion of polymer chains in poly (dimethylsiloxane) mixturesThe FGSE-NMR could measure diffusion coefficient for each component in polymer mixtures separately. Role of hydrodynamic interactions in chain diffusion in melts was revealed.(2) Diffusion of polymer chains dissolved in microdomains of blockcopolymers Was measured diffusion coefficient of B-polymer chains which were dissolved in microdomains of A-B and A-B-A type block copolymers. Diffusion behavior of tracer chains are controlled by location of the dissolved chains in the domain.(3) Diffusion of water molecules in polymer gelsDiffusion coefficient of water molecules in a poly (methacrylic acid) hydro-gel was measured as a function of the degree of swelling, and diffusion of the free water was found to be slower at the higher degrees of swelling.

1. Development of a NMR probe for the super-high magnetic-field gradient spinecho (FGSE-NMR)(1) We have succeeded in construction of the probe with following specifications.Maximum of magnetic-field gradient 600G/cmSample size diameter 5mm x length 8mmPulse width 0.03-50msPulse interval 5-600msGenerated magnetic-field gradient was calibrated against applied electric current, and reliability of确认了测量。通过考虑残留磁场的效果来确定可用的脉冲宽度和脉搏间隔范围。这里达到的最大梯度是聚合物场中报告值的最高梯度。2。通过以下有关聚合物动力学的实验研究，将FGSE-NMR方法与该探针的聚合物系统应用应用。（1）聚合物链在聚（二甲基硅氧烷）混合物中的聚合物链扩散可以测量聚合物混合物中每个组件的扩散系数。（2）测量了溶解在融合体的链扩散中的作用。（2）测量了溶解在区块聚合物微域中的聚合物链的扩散的B-聚合物链的扩散系数，这些B聚合物链的扩散系数溶于A-B和A-B-A-B-A类型块共聚物。示踪剂链的扩散行为是通过溶解链在结构域中的位置控制的。（3）水分子在聚合物胶质胶状分子中在聚（甲基丙烯酸）水凝胶中的水分子的扩散是在肿胀程度和较高的水中的膨胀程度上测量的。