Development of micro/macro-scale dynamic characterization system and its application to polymer gel science

微观/宏观动态表征系统的开发及其在聚合物凝胶科学中的应用

• 批准号: 12355033
• 负责人: ANDO Isao
• 金额: $ 21.32万
• 依托单位: Tokyo Institute of Technology
• 依托单位国家: 日本
• 项目类别: Grant-in-Aid for Scientific Research (A)
• 财政年份: 2000
• 资助国家: 日本
• 起止时间: 2000 至 2002
• 项目状态: 已结题
• 来源: https://kaken.nii.ac.jp/grant/KAKENHI-PROJECT-12355033/
• 关键词: high field gradient NMR; gel science; polymer gel; diffusion coefficient; NMR imaging; dynamics; three-dimensional images; micro-macro scale

Polymer gels consist of two components of network polymer chains and solvent. Further, a third component such as a low molecular-weight compound or polymer is often contained in the gels. Polymer gels have attracted considerable attention from the point-of-view of various physical and chemical properties. For example, hydroelectrolyte gels show a dramatic change in volume in response to change in solvent composition, pH, ionic strength and temperature. They contract upon application of an electric field. Further, water-swollen polymer gels can convert chemical energy into mechanical energy. These properties lead to the vitality of polymer research and development of a diversity of interests in polymer gel systems. In order to develop new polymer materials, polymer gel design has been performed on the basis of advanced polymer science and technology. The properties of polymer gels are closely related to their structures and dynamics. From such situations, the establishment of methods for elucidating the structures and dynamics is important for making reliable polymer gel design and developing new advanced polymer gels and also is important for polymer science. From such a background, we have successfully developed by high field-gradient spin-echo(PFGSE) NMR system and NMR imaging system capable of determining very small diffusion coefficients of 10^-10 - 10^-11 cm^2/s and three-dimensional image pattern about spin density and diffusion coefficient distribution, and have elucidated structure and dynamics of polymer gels.

聚合物凝胶由网络聚合物链和溶剂两部分组成。此外，第三组分如低分子量化合物或聚合物通常包含在凝胶中。从各种物理和化学性质的观点来看，聚合物凝胶引起了相当大的关注。例如，水电解质凝胶响应于溶剂组成、pH、离子强度和温度的变化而显示出体积的显著变化。它们在电场作用下收缩。此外，水溶胀的聚合物凝胶可以将化学能转化为机械能。这些性质导致了聚合物研究的活力和对聚合物凝胶体系开发的多样性的兴趣。为了开发新的高分子材料，在高分子科学和技术的基础上进行了高分子凝胶设计。聚合物凝胶的性质与其结构和动力学密切相关。因此，建立一套结构和动力学的研究方法，对于进行可靠的聚合物凝胶设计和开发新型的高分子凝胶具有重要意义，对高分子科学也具有重要意义。在这样的背景下，我们成功地开发了能够测定10^-10 - 10^-11 cm ^2/s的非常小的扩散系数以及关于自旋密度和扩散系数分布的三维图像图案的高场梯度自旋回波（PFGSE）NMR系统和NMR成像系统，并阐明了聚合物凝胶的结构和动力学。

项目成果

Y. Hotta and I. Ando: "A study of shrinkage process of a polymer gel under electric field by ^1H NMR imaging method using an NMR cell with thin platinum electrodes"J. Mol. Structure. 602/603. 165-170 (2002)

Y. Hotta 和 I. Ando：“使用具有薄铂电极的 NMR 单元通过 ^1H NMR 成像方法研究聚合物凝胶在电场下的收缩过程”J。

I. Ando, S. Kuroki, C. Zhao, M. Kobayashi and M. Matsukawa: "Polymer Gels and Networks"Book, Marcel Dekkar, Inc., New York, US. Chapter 2 (2002)

I. Ando、S. Kuroki、C. Zhu、M. Kobayashi 和 M. Matsukawa：“聚合物凝胶和网络”一书，Marcel Dekkar, Inc.，美国纽约。

M.Kobayashi, S.Kuroki, I.Ando, K.Yamauchi, H.Kimura, K.Okita, M.Tsumura, K.Sogabe: "A structural study of silicon-based interpenetrating polymer networks by solid state ^1H and ^<13>C NMR spectroscopy"J.Mol.Structure. 602/603. 321-333 (2002)

M.Kobayashi、S.Kuroki、I.Ando、K.Yamauchi、H.Kimura、K.Okita、M.Tsumura、K.Sogabe：“基于固态 ^1H 和 ^ 的硅基互穿聚合物网络的结构研究

Y.Machida,S.Kuroki,M.Kanekiyo,M.Kobayashi,I.Ando and S.Amiya: "A Structural Study of Water in a Poly(vinyl alcohol) Gel by ^<17>O NMR Spectroscopy"J.Mol.Structure. 554. 81-90 (2000)

Y.Machida、S.Kuroki、M.Kanekiyo、M.Kobayashi、I.Ando 和 S.Amiya：“通过 17 O NMR 光谱对聚（乙烯醇）凝胶中的水进行结构研究”J.Mol

Y.Yin,C.Zhao,S.Kuroki and I.Ando: "Diffusional Behavior of Polypeptides in the Thermotropic Liquid Crystalline State as Studied by Pulse Field-Gradient Spin-Echo ^1H NMR Method"J.Chem.Phys.. 113. 9606-9611 (2000)

Y.Yin，C.Zhao，S.Kuroki 和 I.Ando：“通过脉冲场梯度自旋回波 ^1H NMR 方法研究的热致液晶态多肽的扩散行为”J.Chem.Phys.. 113