CAJ | 학술논문

以氧化还原法为基础制备了两种非改性的还原氧化石墨烯(RGO)：水合肼还原制备的RGO（RGO-N）和水合肼还原后真空退火制备的RGO（RGO-V），之后以这两种RGO和聚甲基丙烯酸甲酯（PMMA）为原料通过简单溶液复合法制备了PMMA/RGO复合材料。通过透射电子显微镜、原子力显微镜和X射线光电子能谱对两种RGO的形貌和结构进行了表征。结果表明，这两种RGO都为单层或少数几层的片状结构，其中RGO-V的导电性高于RGO-N，且其厚度低于RGO-N。通过扫描电子显微镜对PMMA/RGO复合材料的断面形貌进行了表征，发现RGO能均匀地分散在PMMA中并且与PMMA有明显的界面相互作用。进一步研究了不同RGO含量下制备的PMMA/RGO复合材料介电性能的变化。结果表明，两种RGO均能提高复合材料的介电常数；且随着RGO含量的增加，复合材料的介电常数明显增大，而介电损耗变化不大。在室温及1000 Hz下，当RGO-V体积分数为2.75%时， PMMA/RGO-V复合材料的介电常数为20.5，是纯PMMA的的5倍，是相同RGO含量下PMMA/RGO-N复合材料的2.5倍，而介电损耗仅为0.80。
이양화환원법위기출제비료량충비개성적환원양화석묵희(RGO)：수합정환원제비적RGO（RGO-N）화수합정환원후진공퇴화제비적RGO（RGO-V），지후이저량충RGO화취갑기병희산갑지（PMMA）위원료통과간단용액복합법제비료PMMA/RGO복합재료。통과투사전자현미경、원자력현미경화X사선광전자능보대량충RGO적형모화결구진행료표정。결과표명，저량충RGO도위단층혹소수궤층적편상결구，기중RGO-V적도전성고우RGO-N，차기후도저우RGO-N。통과소묘전자현미경대PMMA/RGO복합재료적단면형모진행료표정，발현RGO능균균지분산재PMMA중병차여PMMA유명현적계면상호작용。진일보연구료불동RGO함량하제비적PMMA/RGO복합재료개전성능적변화。결과표명，량충RGO균능제고복합재료적개전상수；차수착RGO함량적증가，복합재료적개전상수명현증대，이개전손모변화불대。재실온급1000 Hz하，당RGO-V체적분수위2.75%시， PMMA/RGO-V복합재료적개전상수위20.5，시순PMMA적적5배，시상동RGO함량하PMMA/RGO-N복합재료적2.5배，이개전손모부위0.80。
Two kinds of non-modified reduced graphene oxide (RGO) based on oxidation-reduction method:RGO-N only reduced by hydrazine hydrate and RGO-V reduced by hydrazine hydrate plus annealing in vacuum. Then poly(methyl methacrylate) (PMMA)/RGO composites were fabricated with a simple solution blending methods by using this two kinds of RGO and PMMA. The morphologies and structures of the two kinds of RGO were characterized by TEM,AFM and XPS. The results show that the two kinds of RGO all consist of single layer or few layers graphene,the conductivity of RGO-V is higher than that of RGO-N and the thickness of RGO-V is thinner than that of RGO-N. The fracture appearances of the PMMA/RGO composites were investigated by SEM and it was found that the two kinds of RGO can disperse well in PMMA matrix and behave evident interaction with PMMA. The dielectric properties of PMMA/RGO composites with different RGO content were further studied. The results indicate that the two kinds of RGO can both improve the dielectric constant of the composites. With increasement of RGO content,the dielectric constant become higher and the dielectric loss is still low. At 1 000 Hz and room temperature,when the volume fraction of RGO-V is 2.75%,the dielectric constant of PMMA/RGO-V composite is 20.5, which is 5 times higher than that of pure PMMA and 2.5 times higher than that of PMMA/RGO-N composite with same RGO-N content,and the dielectric loss is only 0.80.