Binary blends of the sulfonated poly(ether ether ketone) (SPEEK)-poly(ether imide) (PEI) and SPEEK-polycarbonate (PC), and ternary blends of the SPEEK-PEI-PC, were investigated by differential scanning calorimetry. SPEEK was obtained by sulfonation of poly(ether ether ketone) using 95% sulfuric acid. From the thermal analysis of the SPEEK-PEI blends, single glass transition temperature (Tg) was observed at all the blend composition. For the SPEEK-PC blends, double TgS were observed. From the results of thermal analysis, it is suggested that the SPEEK-PEI blends are miscible and the SPEEK-PC blends are immiscible. Polymer-polymer interaction parameter (χ12) of the SPEEK-PEI blends was calculated from the modified Lu and Weiss equation, and found to range from -0.011 to -0.825 with the blend composition. For the SPEEK-PC blends, the χ12 values were calculated from the modified Flory-Huggins equation, and found to range from 0.191 to 0.272 with the blend composition. For the SPEEK-PEI-PC ternary blends, phase separation regions that showed two TgS were found to be consistent with the spinodal curves calculated from the χ12 values of the three binary blends.
|Number of pages||7|
|Journal||Journal of Applied Polymer Science|
|Publication status||Published - 2000 Dec 1|
ASJC Scopus subject areas
- Polymers and Plastics