Development of Strongly Correlated Softmaterials Responsive to Stimuli and Environment through Dynamic Control of Hydrogen Bonding

通过氢键等非共价相互作用，通过分子自组织过程制备了对刺激和环境有响应的强相关功能软材料。(1)制备了热致液晶叶酸衍生物。它们在较宽的温度范围内通过自组装表现出柱状和胶束立方相。圆二色性测量表明，在叶酸衍生物中加入钠盐可诱导柱状和立方相的手性结构。这些材料是一种新型的刺激响应自组装材料。此外，叶酸配合物表现出的手性胶束立方相是这种相的第一个例子。(2)在热致液晶中引入自组装纤维制备了液晶物理凝胶。扭向列状细胞中相分离结构和分子取向的控制导致了快速和低压响应特性的诱导。(3)离子液体与端功能化的氢键介生分子络合制备了低（一、二）维离子导电材料。通过化学改性制备了热致液晶离子液体。这些材料的纳米相分离结构和分子取向的控制导致了高离子电导率和各向异性。聚环氧乙烷部分和液晶聚合物的结合形成了具有层状纳米结构的独立的二维离子导电膜。这是第一个基于有机分子的低维离子导电材料。

Strongly-correlated functional softmaterials responsive to stimuli and environment have been prepared through molecular self-organization processes via non-covalent interactions such as hydrogen bonding.(1) Thermotropic liquid crystalline folic acid derivatives have been prepared. They exhibit columnar and micellar cubic phases by self-assembly over wide temperature ranges. The circular dichroism measurements have shown that the addition of a sodium salt to the folic acid derivatives induces chiral structures in columnar and cubic phases. These materials are a new type of stimuli-responsive self-assembled materials. Moreover, the chiral micellar cubic phase exhibited by the folic acid complex is the first example of this phase.(2) Liquid crystalline physical gels have been prepared by the introduction of self-assembled fibers into thermotropic liquid crystals. The control of phase-separated structures and molecular orientation in twisted nematic cells leads to the induction of the properties of fast and low-voltage responses.(3) Low (one and two)-dimensional ion conductive materials have been prepared by complexation of ionic liquids and end-fuctionalized hydrogen-bonded mesogenic molecules. Thermotropic liquid crystalline ionic liquids have been prepared by chemical modification. The control of nanophase-segregated structures and molecular orientation of these materials results in the high ion conductivities and anisotropy. The combination of poly(ethylene oxide) moieties and liquid crystal polymers leads to the formation of free-standing two-dimensional ion conductive films that have layered nanostructures. These are the first low-dimensional ion conductive materials based on organic molecules.