This study reports the synthesis of poly(methyl methacrylate) (PMMA)-carbon nanotube (CNT)-reduced graphene oxide (rGO) emulsions via reversible addition-fragmentation chain-transfer (RAFT)-mediated surfactant-free emulsion polymerization using a hydrophilic chain transfer agent. The rGO was prepared by the modified Hummers method and reduced with L-ascorbic acid. The effects of the CNT:rGO ratios and CNT and rGO contents on the conversion and stability of emulsion were investigated. Increasing the CNT and rGO contents from 1 to 4 wt% decreased the monomer conversion, while all the samples remained as colloidal dispersions. The morphology of PMMA-CNT-rGO composites showed the incorporated arrangement of a linear CNT portion connected with the rGO sheet dependent on the CNT:rGO ratio. Various PMMA-CNT-rGO filled natural rubber (NR) cast films were prepared. The NR/PMMA-CNT-rGO composite film with a 1 wt% filler loading at a CNT:rGO ratio of 1:1 presented a quite high modulus value (3.08 MPa) and sufficient intrinsic electrical conductivity (1.36 S/m) due to its strong filler-matrix interaction. Thus, the PMMA-RAFT-CNT-rGO composites at a very low filler content can be used as an effective reinforcement to enhance the mechanical and electrical properties of NR films with a high compatibility between the fillers and NR matrix.

中文翻译：

---

导电 NR/PMMA-RAFT-CNT-rGO 复合材料及其形态、机械和电性能


本研究报告了使用亲水链通过可逆加成断裂链转移（RAFT）介导的无表面活性剂乳液聚合合成聚（甲基丙烯酸甲酯）（PMMA）-碳纳米管（CNT）-还原氧化石墨烯（rGO）乳液转让代理。 rGO是通过改进的Hummers法制备的，并用L-抗坏血酸还原。研究了CNT:rGO比例以及CNT和rGO含量对乳液转化率和稳定性的影响。将 CNT 和 rGO 含量从 1 wt% 增加到 4 wt% 会降低单体转化率，而所有样品仍保持胶态分散体。 PMMA-CNT-rGO 复合材料的形态显示了与 rGO 片材连接的线性 CNT 部分的合并排列，具体取决于 CNT:rGO 比率。制备了各种 PMMA-CNT-rGO 填充天然橡胶 (NR) 流延膜。填料含量为 1 wt%、CNT:rGO 比例为 1:1 的 NR/PMMA-CNT-rGO 复合薄膜呈现出相当高的模量值 (3.08 MPa) 和足够的本征电导率 (1.36 S/m)，这是由于其强大的填料-基质相互作用。因此，填料含量极低的PMMA-RAFT-CNT-rGO复合材料可以用作有效的增强材料，以提高NR薄膜的机械和电性能，同时填料和NR基体之间具有高相容性。