Compatibility studies of sulfonated poly(ether ether ketone)-poly(ether imide)-polycarbonate ternary blends

Yong Sung Chun, Hyun Sung Kwon, Woo Nyon Kim, Ho Gyu Yoon

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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.

Original languageEnglish
Pages (from-to)2488-2494
Number of pages7
JournalJournal of Applied Polymer Science
Issue number14
Publication statusPublished - 2000 Dec 1


ASJC Scopus subject areas

  • Polymers and Plastics

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