Research on Basic Properties and Structure of ionized Gels

离子化凝胶的基本性质和结构研究

• 批准号: 10440116
• 负责人: HIROTSU Shunsuke
• 金额: $ 6.08万
• 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 (B)
• 财政年份: 1998
• 资助国家: 日本
• 起止时间: 1998 至 1999
• 项目状态: 已结题
• 来源: https://kaken.nii.ac.jp/grant/KAKENHI-PROJECT-10440116/
• 关键词: Polymer gels; Volume phase transition; Dynamic light scattering; Gelation; ゲルの物性; 微小電位測定; ゲル; 電解質高分子; イオン性ゲル; 電位分布; pH分布

Reasearch on the mechanism of the volume phase transition : Traditional view on the mechanism of the volume phase transition in gels has been critically analyzed. We have proposed a new model of the volume phase transition in which the shrunken phase is not a get but a precipitated network. Experimental evidences supporting this new model have been obtained by dynamic light scattering and elastic relaxation measurements.Meso-phase formation in ionized gels : Formation of mesoscopic structure accompanied by charge separation has been investigated by static and dynamic light scattering. A clear evidence of meso-phase formation have been obtained both in relaxation and intensity of the scattered light. This is the first example demonstrating that the meso-phase can be studied not only by neutron but also visible light.Elastic measurements near the volume phase transition : A new apparatus for mesuring elastic constants and elastic relaxation has been built. Using this apparatus elastic behaviors around the volume phase transition have been succesfully measured.Structural differences between biologal polymer gels and synthesized gels : In terms of light scattering measurements, the structural difference between acrylamide family gels and bilogical polysaccharides has been studied. The difference is considered to be due mainly to the difference in crosslinking mechanisms.

体积相变机理的探讨：批判性地分析了凝胶体积相变机理的传统观点。提出了一种新的体积相变模型，其中收缩相不是凝块而是沉淀网络。通过动态光散射和弹性弛豫测量得到了支持这一新模型的实验证据。离子化凝胶中介观相的形成：通过静态和动态光散射研究了伴随电荷分离的介观结构的形成。在弛豫和散射光强度方面都获得了中间相形成的明确证据。这是第一个不仅可以用中子而且可以用可见光研究介观相的例子。体相变附近的弹性测量：建立了一个测量弹性常数和弹性弛豫的新装置。用该装置成功地测量了体积相变前后的弹性行为。生物高分子凝胶与合成凝胶的结构差异：用光散射测量方法研究了丙烯酰胺类凝胶与生物多糖的结构差异。这种差异被认为主要是由于交联机制的差异。

项目成果

岡嶋孝治,弘津俊輔: "ゲルの高速収縮のパーコレーションモデル"高分子学会予稿集. 48・9. 2118-2119 (1999)

Koji Okajima、Shunsuke Hirotsu：“凝胶高速收缩的渗流模型”高分子科学技术学会论文集 48・9（1999）。

Shunsuke Hirotsu: "anomalous kinetics of the Volume Phase Transition in Poly-N-isopropylacrylamide Gels"Jpn.J.Appl.Phys.. 37. L284-287 (1998)

Shunsuke Hirotsu：“聚-N-异丙基丙烯酰胺凝胶中体积相变的反常动力学”Jpn.J.Appl.Phys.. 37. L284-287 (1998)

Shinji Haneda, Kazufumi Nishio, Shintaro Ogawa, Takaharu Okajima, and Shunsuke Hirotsu: "Light Scattering Study on Thermoreversible Gelation in Biological Polysaccharides"Transactions MRS-J. (in press). (2001)

Shinji Haneda、Kazufumi Nishio、Shintaro Okawa、Takaharu Okajima 和 Shunsuke Hirotsu：“生物多糖热可逆凝胶化的光散射研究”交易 MRS-J。

Takaharu Okajima et al: "Volume Phase Transition in Neutral Conolymes Gels"Transactions of MRS-J. (印刷中). (2001)

Takaharu Okajima 等人：“中性 Conolymes 凝胶中的体积相变”Transactions of MRS-J（印刷中）。

Shunsuke Hirotsu: "Anomalous Kinetics of the Volume Phase Transition in Poly-N-acrylamide Gels"Jpn.J.Appl.Phys.. Vol 37. L284-287 (1998)

Shunsuke Hirotsu：“聚-N-丙烯酰胺凝胶中体积相变的反常动力学”Jpn.J.Appl.Phys.. Vol 37. L284-287 (1998)