聚合物单分子膜的动态弹性和二维橡胶态

The mechanical properties of macromolecular films are not only important in condensed physics of macromolecule, but also closely related to the practical applications of the films. With a home-made Langmuir balance, the dynamic elasticities of monolayers for low molecular weight compounds, polymers and monomers before and after polymerization were measured directly by applying the dynamic oscillation method. The physicochemical properties of monolayers, such as monolayer formation, phase structure and intermolecular interactions, were studied and affected by the monolayer-forming conditions, such as temperature, surface pressure, pH value, subphase ions, "surface ions" and so on. Based on the experimental results that the dynamic elasticity of monomer monolayer are larger than its polymer monolayer and the polymer monolayer has lower dynamic elasticity at higher polymerization degree, the existence of the two-dimensional rubbery state of polymer was proposed. The dynamic elasticity of monolayer can expose the intermolecular interactions between the monolayer components. Therefore, the component-controllable multicomponent functional LB films and nano ceramic films can be fabricated, which is very favorable and promising in applying LB films in sensors, molecular electronic devices, etc.

聚合物的二维橡胶态是极端条件下高分子物理的基本问题。本申请在Langmuir膜天平上对单分子膜进行动态弹性测定，以期直接验证聚合物单分子膜可能存在的二维橡胶态及其表征。研究包括单体单分子膜聚合前后的动态弹性；聚合物直接成膜的动态弹性的分子量依赖性和合成玻璃化温度在室温的两亲性聚合物单分子膜动态弹性的温度依赖性直接证明二维橡胶态。