Abstract

Changes in retention factor k of light hydrocarbons on PIM-1 stationary phase with an increase of ageing temperature are tested. Varying the ageing temperature from 50 to 200°C causes a slight decrease in solute retention, which, however, changes to strong increase as soon as the ageing temperature exceeds 200°C. An increase of the solute retention factor k means the proportional increase of the Henry equilibrium constant K, which in turn under constant chromatographic conditions probably points out the thermodynamic changes in the structure of PIM-1 which can be caused either by a chemical decomposition or by a structural rearrangement. Due to high chemical stability of PIM-1, an increase of solute retention with thermal ageing is a consequence of structural rearrangements of polymeric chains, resulting in more adapted adsorption sites. At the same time, accessibility of the adsorption sites decreases as it is indicated by the reduction of column efficiency and diffusion coefficients.

中文翻译：

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色谱技术检测到的PIM-1聚合物异常结构变化

抽象的

测试了随着老化温度的升高，轻烃在PIM-1固定相上的保留因子k的变化。将时效温度从50°C更改为200°C会导致溶质保留量略有下降，但是，当时效温度超过200°C时，溶质保留量会急剧增加。溶质保留因子k的增加意味着亨利平衡常数K的比例增加，这反过来又说明了在恒定色谱条件下PIM-1结构的热力学变化，这可能是由于化学分解或结构重排引起的。由于PIM-1的高化学稳定性，溶质保留随着热老化的增加是聚合物链结构重排的结果，从而导致更适合的吸附位点。同时，由于柱效和扩散系数的降低表明吸附位的可及性降低。