PP-grafted GO was prepared by the reaction of graphene oxide (GO) containing 2-bromoisobuyryl groups and polypropylene (PP) having hydroxyl groups (PP-OH) via a "grafting-to" method. GO-Br was synthesized by the reaction of GO and 2-bromoisobutyryl bromide under a basic condition. PP-MAH was reacted with ethanolamine to produce PPOH. The melting temperature of PP-grafted GO was shifted to the higher temperature than that of PP-OH. Also, the thermal stability of PP-grafted GO was increased as compared to PP-OH and GO. These results demonstrated that the grafted coating polymer PP was effective for enhancing the thermal stability of GO. The higher surface roughness of PP-grafted GO was resulted from the chemical attachment of PP on the surface of GO. The characterization of PP-grafted GO was conducted from Fourier transform infrared spectroscopy (FTIR), Raman spectroscopy, differential scanning calorimetry (DSC), thermogravimetric analysis (TGA), and scanning electron microscope (SEM).

폴리프로필렌(PP)으로 그래프트된 그래핀 옥사이드(PP-grafted GO)는 2-bromoisobutyryl 그룹을 가진 GO (GO-Br)와 하이드록시 그룹을 가진 PP(PP-OH)와의 "grafting-to" 화학반응을 통하여 제조하였다. GO-Br은 GO와 2-bromoisobutyryl bromide를 염기촉매 하에서 반응시켜 얻을 수 있었고, PP-OH는 maleic anhydride가 그래프트된 PP(PP-MAH)와 ethanolamine과 반응하여 제조하였다. 제조된 PP-grafted GO는 PP-OH에 비하여 녹는점이 높은 온도로 이동하였고, 열적 안정성은 GO와 PP-OH에 비하여 우수한 것을 확인하였다. 이러한 결과는 그래프트된 PP 고분자가 GO의 열적 안정성을 향상시키는 것으로 판단된다. 또한 PP-grafted GO의 표면은 GO-Br에 비하여 거칠기가 증가되는 것을 확인하여 PP가 GO 표면에 화학적으로 결합한 것을 알 수 있었다. 제조된 PP-grafted GO의 분석은 FTIR, Raman, DSC, TGA, SEM과 같은 다양한 분석장비를 이용하여 수행하였다.

Keywords: PP-grafted GO; surface roughness; grafting-to; thermal stability; melting temperature.