Preparation of low density polyimino kefones foams

Based on the polyimino ketone(PIKs), low density microporous foams were successfully prepared with the dioxane solvent by the general freezing-dry technology. In order to analyze the relationship between polymer concentration and foam density, a series of PIKs solution with different concentrations were confected. The results show that the polymer concentration has a good linear relationship with the actual density of PIKs foams and there is a fixed difference between the actual density and theoretic density, which will effectually control the density of foams. The pore structures of foams were also analyzed. The results show that with the increase of densities, the average pore size and BET surface area decrease. The general properties of PIKs foams are characterized by means of DSC, TG,