, Volume 61, Issue 4, pp 501-509
Date: 27 Jun 2008

Determination of Flory interaction parameters between polyimide and organic solvents by HSP theory and IGC

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Flory-Huggins interaction parameter χ12 is an important parameter used for characterizing the interaction intensity between polymer and solvent. In this work, two methods were used to calculate the χ12 values of a polyimide (HQDPA-DMMDA) and twelve organic solvents. One method was inverse gas chromatography (IGC) technique, another was Hansen Solubility Parameters (HSP) theory. For the IGC experiment, χ12 was measured with an extrapolation method for the carrier gas when the temperature was changed from 50circC to 80°C. For the HSP approach, the Beerbower group contribution method was used to calculate the HSP values of the polyimide. It was found that the χ12 values of the polyimide and the organic solvents calculated from the two methods were similar. Consequently, the Beerbower group contribution method can be used to calculate HSP, and the HSP can be used to rapidly estimate the Flory–Huggins interaction parameter χ12.