화학공학소재연구정보센터
홈 로그인 로그아웃 연락처 사이트맵
Macromolecular Research, Vol.20, No.5, 477-483, May, 2012
DOI10.1007/s13233-012-0067-5  Export Citation
Ionic Aggregation Characterization of Sulfonated PEEK Ionomers Using by X-Ray and DMA Techniques
Ju-Myung Song, Junhwa Shin, Joon-Yong Sohn, and Young Chang Nho†
  • Advanced Radiation Technology Institute, Korea Atomic Energy Research Institute, Jeonbuk, 580-185, Korea
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Commercial Victrex® poly(ether ether ketone) was dissolved and sulfonated using sulfonic acid at an elevated temperature of 55-70 ℃. Various techniques such as thermogravimetric analysis, dynamic mechanical analysis(DMA), differential scanning calorimetry (DSC), and small-angle X-ray scattering (SAXS) were employed to investigate the mechanical properties and morphology of sulfonated poly(ether ether ketone) (SPEEK) film. Sulfonation temperatures were shown to have a direct effect on the degree of sulfonation. The DMA study showed that welldeveloped α-relaxation peaks related to chain relaxation in the ionic regions shifted to higher temperatures as sulfonation degree increased. However, the β- and γ-relaxation peaks showed that the peaks related to chain relaxation in the crystalline regions shifted to lower temperatures as sulfonation degree increased. These DMA results suggest that the sulfonic acid groups act as very effective plasticizers for the intercrystalline regions. DSC thermograms showed that the glass transition shifted systematically to higher temperatures as the sulfonation degree increased. In the SAXS study, an ionic domain peak was observed and the peak position shifted to a slightly higher angle as sulfonation degree increased, implying that the number of ionic aggregates increased.
Keywords:sulfonated poly(ether ether ketone) (SPEEK);ionomer;mechanical properties;morphology;film;membrane.
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