反相色谱法表征聚苯乙烯磺酸的转变现象

1969年,Smidsrφd和Guillet就应用反相色谱法(IGC)测量聚合物的玻璃化转变温度。十几年来许多科学工作者研究了IGC测量聚合物玻璃化转变现象的各种影响因素,但应用IGC研究离聚物还属罕见。离聚物分子上带有离子基闭,分子间的相互作用比较复杂,我们曾用热激放电电流法(TSDC)等测量了本实验所用的聚苯乙烯磺酸(PSSA)样品的玻璃化转变现象。应用IGC法,不仅能够比较精密地测出不同磺化度

Characterization of Transition Phenomena in Polystyrene - sulfonic Acid by Inverse Gas Chromatography

The transition phenomena of polyslyrenesulfonic acid (PSSA) with various degree of sulfonation were investigated by inverse gas chromatograpl y (IGC). The model Z-shaped retention diagrams have been obtained. The glass transition temperatures of a series of PSSA which were measured from these diagrams are in agreement with those measured by thermally stimulated discharge current analysis, differential scanning calorimetry and dynamic viscoelastometry previously. Furthermore, the IGC method with excellence of convenience and accuracy might provide more definite data for explaining the molecular mechanism of transition phenomena of solid PSSA ionomers. In addition, we have explored the effect of the water adsorption of PSSA on determination of Tg, According to these Z-shaped retention diagrams, the enthalpy of adsorption of n-dodecane on surface of PSSA was also calculated. The result of this calculation shows the enthalpy of adsorption was essentially independent of the degree of sulfonation of PSSA.