The control of polymer architecture has been of great interest in the development of new polymeric materials. Therefore, various polymer topologies were developed such as star-like, comb-like, dendrimer, and cyclic polymers with in-tune properties. In particular, cyclic polymers especially have attracted significant attention due to their unique properties associated with chain topologies. Thus, researchers have endeavored to prepare various cyclic polymers which include sun-, tadpole-, 8-, manacle-shaped cyclic polymer, etc. Their complex molecular topologies offer new opportunities to tune dynamic and thermo mechanical properties without changing chemical species of the polymers.<br/>Our group has also synthesized multi-cyclic polymers such as bi-cyclic, tri-cyclic, 8-cyclic polymers using combination of atom transfer radical polymerization (ATRP), azidation and copper-catalyzed alkyne azide cycloaddition click reaction. However, in the course of multi-cyclic polymer synthesis, high molecular weight impurities are also observed due to undesired side-reactions in a multi-functional reaction due to various reasons. Therefore we try to obtain pure cyclic product by separating the concurrently obtained high molecular weight impurities using fractionation of solvent gradient normal phase liquid chromatography through preferential column interaction. In our researches, bi-cyclic polymer, tri-cyclic polymer and 8-cyclic polymers were synthesized and analyzed using size exclusion chromatography, MALDI-TOF. The purity of the cyclic polymers was also examined by using two-dimensional liquid chromatography. Furthermore, the glass transition behavior of the high-purity multicyclic polymers was investigated by differential scanning calorimetry.

Synthesis and analysis of various shape of multicyclic polystyrenes

254th National Meeting (2017)

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