CM oxide (CMO) was prepared by oxidizing carbon material (CM) (graphite, carbon nanotube) using the Hummers method and the CMO was coupled with benzyl dimethyl hexadecyl ammonium chloride (BDHd) to synthesize cationically functionalized CM (BdCMO). Also waterborne polyurethane (WPU) was prepared by using isophorone diisocyanate (IPDI), and poly(tetramethylene glycol) (PTMG) and controlling the contents of dimethylol propionic acid (DMPA), and methylene diethanol amine (MDEA). Then, waterborne polyurethane/functionalized carbon material (WPU/F-CM) nanocomposites were made by blending the ionically functionalized carbon fillers into waterborne polyurethanes in assigned ratios. Comparing with the pristine WPU the mechanical and thermal properties of the composites were varied with type of the carbon filler and ionic group as well as the ratio of filler contents.

그라파이트와 탄소나노튜브같은 탄소소재(carbon materials, CM)를 화학적으로 산화시킨 CM oxide(CMO)와 이를 벤질 디메틸 핵사데실 염화암모늄(BDHd)과 결합시켜 양이온으로 기능화된 CM(BdCMO)을 제조하였다. 또한 isophorone diisocyanate(IPDI)와 poly(tetramethylene glycol)(PTMG)을 이용하고 음이온성과 양이온성의 이오노머인 dimethylol propionic acid(DMPA), methylene diethanol amine(MDEA)의 함량을 조절하여 이온성 작용기가 조절된 수 분산 폴리우레탄(WPU)을 합성하였다. 이들 WPU에 다양한 비율의 BdCMO을 혼합하여 WPU/F-CM 나노복합체를 제조하여 WPU 내 이오노머의 조절, 혼합된 CM의 함량과 종류에 따른 기계적 성질과 열적 성질에 다양한 변화가 나타났다.

Keywords: waterborne polyurethane, graphene oxide, carbon nanotube, nanocomposite