Effect of Solvent Used for Density Measurement

The density of pol5mer film 2 of the third series of polyimides (Table 3.6) which was S5mthesized in NMP, before and after treatment with sc-CO, was measured in two solvents ethanol and isopropanol. By using the 

TABLE 3.9 Change of the Swelling Degree with the Increase of Temperature of sc-CO Treatment of Polyimide 2 of the Third Series of Polyimides, Synthesized in NMP, Whose Film was Cast from Chloroform  

FIGURE 3.19 Variation of free volume (AV ) of polymer film 1 (Table 3.6) (synthesized inNMP) by swelling with sc-CO at various temperatures, when the density was measured in isopropanol or in ethyl alcohol. 

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