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본 연구에서는 pellet 상태의 polyetherimide (PEI)를 carbon tetrachloride(CCl4)와 1 ,2-dichloro-ethane (DCE) 의 부피비 5:1 하에서 PEI를 불균일한 상태로 유지시키고, chlorosulfonic acid (CSA)를 이용하여 PEI의 표면을 sulfonation 시킴으로써 , 음이온성을 띠며 친수성이 향상된 sulfonated polyetherimide (SPEI)를 제조하였다. 불균일한 상태가 유지되면서 가장 적합한 sulfonation 반응조건은 PEI: CSA 의 1 : 1 mole ratio, 온도 10℃, 3 시간이었다. 이온교환용량이 0.2~1.2meq/g을 갖는 SPEI를 합성할 수 있었고, FT-IR 측정을 통하여 sulfonic acid peak가 1020cm-1 와 1170cm-1부근에서 관찰되었다. 분자량 분포는 sulfonation을 시킴으로써 좀 더 넓게 나타났고, 접촉각 측정을 통하여 친수성이 향상되었음을 확인하였다.
In this study, polyetherimide with pellet state was sulfonated with a chlorosulfonic acid. The volume ratio of carbon tetrachloride (CCI4/1,2-dichloroethane (DCE) was 5/1. Therefore, sulfonated polyetherimide of anionic charge and more hydrophilicity were produced. The optimum reaction conditions of sulfonation were that PES/CSA mole ratio was I/I, temperature were lO℃ and reaction time were 3hr. SPEls having ion capacity in the range of 0.2-1.2meq/mg were synthesized. Through FT-IR, sulfonic acid peak was shown at 1020cm-1 and 1170cm-1 Polymer dispersity index was broad and we confirmed that PEl was hydrophilzed in the measure of contact angle.
