Instrumentation of New Device to Estimate Gas Permeability and Viscoelastic Properties for Thin Polymeric Membranes Using Quartz crystal Osillator

在本研究中，我们尝试使用石英晶体振荡器来估计原位聚合物膜的气体吸附和扩散性质以及粘弹性。石英晶体微天平（QCM）是一种灵敏度很高的测量仪器，因为它的振荡频率会随着电极上砝码的变化而急剧变化。用QCM装置测得的CO_2吸附等温线与用电微量天平法测得的数据完全吻合，该装置具有可测较高压力、样品量少（约30 μ g）等优点，而且该方法还能测量有机蒸气的吸附。在60个大气压下测定了涂敷在QCM电极上的玻璃态聚合物膜样品的CO_2吸附等温线。吸附等温线可分为两个部分，玻璃态区是凹向压力轴和橡胶态区是线性的。拐点 ...更多信息 等温线的分裂被认为是CO_2吸附增塑引起的等温玻璃化转变点。其次，我们尝试测量硅橡胶的CO_2吸附等温线和CO_2渗透系数。在CO_2临界压力下，溶解度和渗透率发生变化。由此认为，CO_2在聚合物中的聚集程度影响CO_2的渗透性能。另一方面，我们也测量了涂有各种聚合物的石英晶体振荡器的谐振电阻。在9MHz下，电阻在高于草转变温度时突然增加，草转变温度是由在各种频率下的介电色散确定的初始色散温度计算的。聚合物包覆振荡器的谐振频率和电阻特性可以与聚合物的状态（玻璃态、橡胶态、流体态）相对应。从这些研究中，我们可以确认高分子的吸附和粘弹性行为的聚合物涂层石英晶体振荡器的高潜力。少

In this study, we try to estimate the gas sorption and diffusion properties and viscoelasticity of the polymeric membrane in situ using the quartz crystal oscillator. Quartz crystal microbalance, QCM is known to be very sensitive measuring device because the oscillating frequency changes sharply with the variation of weight on the electrode. The CO_2 sorption isotherm obtained by the QCM device was fully pverlapped with the data observed by the electromicrobalance method.This QCM device has some advantages, that is, it can measure up to comparatively high pressure and need only a few specimens (ca.30mug), and so on. Moreover, this QCM method could measure the sorption of organic vapors. The CO_2 sorption isotherms of the glassy polymer film specimen coated on QCM electrode was carried out up to 60 atm. The sorption isotherm obtained can be divided into two sections, the glassy region which is concave toward the pressure axis and the rubbery region which is linear. The inflection point … More splitting up the isotherm is considered the isothermal glass transition point caused by plasticizing by CO_2 sorption. Next, we try to measure the CO_2 sorption isotherms and CO_2 permeability coefficients for the silicone rubber. The solubility and permeability changed at the critical pressure of CO_2. From these results, it was considered that the permeation properties of CO_2 for polymers are influenced by the degree of aggregation of CO_2. On the other hand, we also measured the resonant resistance of the quartz crystal oscillator coated with various polymers. The resistance increased suddenly above the grass transition temperature at 9MHz which is calculated from the primary dispersion temperature determined by dielectric dispersion at various frequencies. The behaviors of resonant frequency and resistance of the polymer-coated oscillator could be corresponding to the state of the polymer, i.e, in glassy, rubbery, fluid states. From these study, we could confirm the high potential of the polymer-coated quartz crystal oscillator for the sorption and viscoelastic behaviors of polymers. Less