Research on Basic Properties and Structure of ionized Gels

体积相变机理的研究：批判性地分析了传统的关于凝胶体积相变机理的观点。我们提出了一种新的体积相变模型，其中收缩相不是一个get而是一个沉淀网络。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。电离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。从散射光的弛豫和散射光强度两方面都得到了中相形成的明显证据。这是第一个证明不仅可以用中子而且可以用可见光来研究介相的例子。体积相变附近的弹性测量：建立了一种新的测量弹性常数和弹性松弛的仪器。利用该装置成功地测量了体积相变周围的弹性行为。生物聚合物凝胶与合成凝胶的结构差异：通过光散射测量，研究了丙烯酰胺家族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不同。

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.