Surface Lewis acid–base properties of polymers measured by inverse gas chromatography

Surface Lewis acid–base properties are significant for polymers materials. The acid constant, Ka and base constant, Kb of many polymers were characterized by some researchers with inverse gas chromatography (IGC) in recent years. In this paper, the surface acid–base constants, Ka and Kb of 20 kinds of polymers measured by IGC in recent years are summarized and discussed, including seven polymers characterized in this work. After plotting Kb versus Ka, it is found that the polymers can be encircled by a triangle. They scatter in two regions of the triangle. Four polymers exist in region I. Kb/Ka of the polymers in region I are 1.4–2.1. The other polymers exist in region II. Most of the polymers are relative basic materials.