| Summary: | 碩士 === 國立臺灣大學 === 高分子科學與工程學研究所 === 105 === The interaction between the platelet-like materials of graphene and nano silicate platelet (NSP) was studied for antistatic applications. Two different source of graphite, electronic graphite and CPC graphite-like materials were compared for illustrating the dispersion mechanism involving the effect of the silicate platelet (NSP) presence. It was discovered that CPC graphite-like with the properties of oleophilic could be well dispersed in aqueous medium. Furthermore, the amphiphilic property and irreversibly dispersion behaviour either in water or in toluene, depending on the exposing order, were achieved for the graphene/NSP nanohybrid. The mechanism involved micelle-like microstructure of oil-in-water and water-in-oil forms. Low molecular weight of POEM (s-POEM), compared with home-made dispersant poly(oxyethylene)-segmented imide (POEM), was synthesized for affecting the dispersibility and long term stability of graphene. As prepared graphene/NSP nanohybrid was solution blending with WPU to form graphene/NSP/WPU nanocomposites film. The comparison among graphene/WPU, NSP/WPU and graphene/NSP/WPU was made. In the absence of NSP, graphene showed sedimentation in the bottom of composite film and resulted in the uneven performance of sheet resistance. The presence of NSP prevented graphene from sedimentation, leading to the Graphene/NSP/WPU nanocomposites, shown the sheet resistance from larger than 1012 of pristine WPU, to 107 ohm/sq with uniform electrical property in both side of film. These graphene/NSP/WPU composites can well meet the requirement of antistatic uses.
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