Graphenation of corundum and silicon carbide filler particles simultaneously improves mechanical properties and electrical conductivity of nonisocyanate polyhydroxyurethanes (NIPU) composites prepared by amine cure of polyfunctional cyclic carbonates. Typically, the ceramic fillers coated with either glucose, polydopamine, or graphite oxide (GO) are thermolyzed to produce an ultrathin graphene shell around the ceramic core, as verified by transmission electron microscopy. As compared to a blend of corundum particles with the thermally reduced graphite oxide (TRGO) nanofiller, graphenation of corundum with GO at a similar total carbon content significantly improves the Young’s modulus (7000 MPa, +184%) of trimethylolpropane glycidylether carbonate (TMPGC) cured with diethylenetriamine (DETA). Moreover, up to 30 wt% of the graphenated corundum filler is uniformly dispersed, whereas a few percent of neat TRGO account for intolerable high viscosity. Furthermore, NIPU composites containing graphenated ceramic fillers exhibit electrical conductivities of up 2.58 × 10⁻⁵ S m⁻¹ well below the percolation threshold of neat TRGO in the same NIPU matrix. Hence, the graphenation of inorganic particles represents a facile and universal synthetic route toward tailoring functional fillers and combines the two worlds of functionalized graphene and inorganic fillers in an economic way by eliminating the tedious syntheses and handling typical for graphene nanofillers.

中文翻译：

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Graphenated陶瓷颗粒作为非异氰酸酯聚羟基聚氨酯复合材料的功能填料

刚玉和碳化硅填料颗粒的吸附同时改善了通过多官能环状碳酸酯的胺固化制备的非异氰酸酯多羟基聚氨酯（NIPU）复合材料的机械性能和电导率。通常，将涂覆有葡萄糖，聚多巴胺或氧化石墨（GO）的陶瓷填料进行热解，以在陶瓷芯周围产生超薄石墨烯壳，这已通过透射电子显微镜验证。与刚玉颗粒与热还原氧化石墨（TRGO）纳米填料的混合物相比，刚玉与GO的石墨化在相似的总碳含量下显着改善了三羟甲基丙烷缩水甘油醚碳酸酯（TMPGC）的杨氏模量（7000 MPa，+ 184％）用二亚乙基三胺（DETA）固化。此外，高达30 wt％的石墨化刚玉填料均匀分散，而百分之几的纯TRGO造成了无法忍受的高粘度。此外，含有石墨化陶瓷填料的NIPU复合材料的电导率高达2.58×10^-5 S m ^-1远低于同一NIPU矩阵中纯净TRGO的渗透阈值。因此，无机颗粒的石墨化代表了一种用于定制功能填料的简便且通用的合成路线，并且通过消除繁琐的合成和通常用于石墨烯纳米填料的处理，以经济的方式将功能化石墨烯和无机填料的两个世界结合在一起。