2-브로모메틸-1,3-디옥솔란을 이용한 2-에티닐피리딘의 중합을 통하여 측쇄에 디옥솔란 치환기를 갖는 새로운 이온성 공액구조 고분자를 합성하였다. 별도의 촉매없이도 중합반응이 잘 진행되어 높은 수율의 중합체를 얻을 수 있었다(76%). 합성한 고분자의 분자구조를 여러 가지 분석장비를 사용하여 분석한 결과 1,3-디옥솔란 부분을 갖는 설계한 공액구조 고분자임을 확인하였다. 고분자의 적외선분광분석 스펙트럼에서는 2110 cm-1 와 3293 cm-1에 서 관찰되었던 2-에티닐피리딘의 아세틸렌 특성피크를 보여주지 않는 대신 1620 cm-1 인근에서 공액이중결합의 탄소-탄소 이중결합의 특성 피크를 보다 강하게 보여주었다. 합성한 고분자의 전기전도도 및 전기-광학적 특성을 측정하고 분석하였다. 요오드로 도핑한 고분자의 전기전도도는 1.82 x 10-3 S/cm 였다.

2-브로모에틸 에틸 에테르를 이용한 2-에티닐피리딘의 무촉매 중합을 통하여 측쇄에 에테르 부분을 갖는 새로운 공액구조 고분자를 합성하였다. 이 중합반응은 비교적 낮은 온도 조건에서도 균일하게 잘 진행 되었으며 89%의 수율로 해당 고분자를 합성할 수 있었다. NMR, IR, UV-visible 분광분석기 등을 이용하여 고 분자의 구조를 분석한 결과 설계한 치환기를 갖는 해당 고분자가 합성되었음을 확인할 수 있었다. 본 고분자는 물을 포함한 DMF, DMSO, DMAc, 메탄올 등의 유기 용매에 완전히 용해하였다. 합성 고분자의 전기화학적 특성과 광발광 특성을 측정하고 분석하였다.

The activated polymerization of 2-ethynylpyridine by using 2-thiophenecarbonyl chloride yielded the corresponding conjugated ionic polymer, poly[2-ethynylN-(2-thiophenecarbonyl)pyridinium chloride] (PETCPC). The polymerization proceeded well to give high yield of polymer without any additional initiator or catalyst. The instrumental analysis data on polymer structure indicated that the present ionic polymer have a conjugated polymer backbone system having N-(2-thiophenecarbonyl)pyridinium chloride as substituents. The photoluminescence maximum peak of PETCPC was located at 573 nm, which corresponds to the photon energy of 2.16 eV. The aromatic functional substituents in the conjugated backbone system shift PL maximum values because it makes different molecule arrangement. The cyclovoltamograms of PETCPC exhibited the electrochemically stable window at 1.24 to 1.80 V region.

There have been continuous research activities towards the designing of various separation technologies for the sequestration of CO2. Organic polymer membranes pay a great attention for its eco-friendliness, simple operation and energy-saving. Polymer membranes such as polyimides, polyethers, TRs and PIMs are well known for their high permeability and excellent mechanical, chemical, and thermal properties. However, the foremost challenge for these polymeric membrane materials is their enhanced selectivity to CO2 without sacrificing permeability. The selectivity problems would be overcome by ionic liquids (ILs), which lead to a considerable attention on RTILs-based sequestrations for CO2/N2 and CO2/CH4 separations. The current research trends based on RTIL polymer membranes, together with our original concept of applying RTIL to various polymeric structures will be presented.

A simple method for generating pores in a cellulose acetate (CA) polymer matrix was developed using a combination of an ionic liquid and water pressure treatment. A porous CA membrane was successfully prepared using the ionic liquid (BMIM-BF4) and subsequent water pressure treatment. Pores were generated in the CA polymer matrix when the CA/ionic liquid composite was subjected to water pressure. The characteristics of the thus-generated porous membrane were evaluated using porosimetry. FT-IR and Thermogravimetric analysis (TGA) showed that when the CA polymer was subjected to water pressure, most of the BMIM-BF4 incorporated in the polymer during its preparation was removed, thereby generating the observed pores. In addition, it was observed that the flux varied with water pressure, indicating that the pore size was controllable.

이 논문은 온도차에 따라 변화되는 이온성 액체와 낮은 밴드갭을 갖는 고분자인 poly(2-heptadecyl-4-vinylthieno[3,4-d]thiazole)(PHVTT) 간의 상호작용 및 고분자 의 거동을 조사하 였다. 이온성 액체는 methyl imidazolium chloride([MIM]Cl), butyl methyl imidazolium chloride([BMIM]Cl), tri-butyl methyl ammonium methyl sulfate([TBMA][ MeSO4])를 사용하였으며, 21, 28, 32, 37℃로 온도를 변화시키며 상호작용의 변화를 UV-vis spectroscopy, FT-IR spectroscopy, photoluminescence spectroscopy를 통해 확인한 결과 이온성 액체인 [MIM]Cl, [TBMA][MeSO4]와 PHVTT의 상호작용은 점차 약해짐을 확인할 수 있었지만, [BMIM]Cl은 온도 변화에 따른 상호작용의 변화를 보이지 않았다.

Use of low bandgap polymers is the most suitable way to harvest a broader spectrum of solar radiations for solar cells. But, still there is lack of most efficient low bandgap polymer. In order to solve this problem, we have synthesised a new low bandgap polymer and investigated its interaction with the ILs to enhance its conductivity. ILs may undergo almost unlimited structural variations; these structural variations have attracted extensive attention in polymer studies. In addition to this, UV-Vis spectroscopy, confocal Raman spectroscopy and FT-IR spectroscopy results have revealed that all studied ILs (tributylmethylammonium methyl sulfate [N1444] MeSO4] from ammonium family) and 1-methylimidazolium chloride ([MIM]Cl, and 1-butyl-3-methylimidazolium chloride [Bmim]Cl from imidazolium family) has potential to interact with polymer. Further, protic ILs shows enhanced conductivity than aprotic ILs with low bandgap polymer. This study provides the combined effect of low bandgap polymer and ILs that may generate many theoretical and experimental opportunities.

A characterization of the permeation and separation using single salt solution was carried out with charged composite membranes. Various charged composite membranes were fabricated by blending an ionic polymer with a nonionic polymer in different ratios. In this study, sodium alginate, chitosan and poly(vinyl alcohol) were employed as anionic, cationic and nonionic polymers, respectively. The permeation and separation behaviors of the aqueous salt solutions have been investigated through the charged composite membranes with various charge densities. As the content of the ionic polymer increased in the membrane, the hydrophilicity of the membrane increased, and pure water flux and the solution flux increased correspondingly, indicating that the permeation performance through the membrane is determined mainly by its hydrophilicity. Electrostatic interaction between the charged membrane and ionic solute molecules, that is, Donnan exclusion, was observed to be attributed to salt rejection to a greater extent, and molecular sieve mechanism was effective for the separation of salts under a similar electrostatic circumstance of solutes.