中文摘要：

采用乳液共混和原位还原法制备了天然橡胶（NR）/还原氧化石墨烯（RGO）纳米复合材料,研究了γ射线辐照对复合材料力学性能和热稳定性的影响.研究结果表明,RGO以少数几层堆叠片层结构均匀分散于NR基体中.RGO的加入可显著提高NR的力学性能和热稳定性,加入质量分数为0.6%的RGO可使材料拉伸强度由（22±1.4）MPa提升至（25±1.1）MPa,质量损失50%对应的温度（T50）升高6.4℃.经200 k Gy的γ射线辐射后,纯NR的拉伸强度和T50分别下降了75%和4.5℃,而NR/RGO-0.6%复合体系仅分别下降了56%和1.2℃.揭示了RGO提高材料耐辐射性能的机理,由于RGO可捕捉猝灭因辐射产生的自由基,从而减弱了辐射老化降解和交联反应的发生.

英文摘要：

Natural rubber（ NR） / chemically reduced graphene oxide（ RGO） nanocomposites were fabricated by latex mixing plus in situ reduction process. The transmission electron microscopy morphology shows that uniform dispersion of RGO with a few layers of stacked lamellar structure can be observed in the nanocomposites. The effect of γ irradiation on the mechanical property and thermal stability of NR matrix by the incorporation of RGO was mainly investigated in detail. Compared to pure NR,the tensile strength increases from（ 22 ±1. 4） MPa to（ 25 ±1. 1） MPa and the thermal decomposition temperature of 50% mass loss（ T50） is increased by 6. 4 ℃ for NR / RGO nanocomposites by the addition of 0. 6% RGO before irradiation. After γirradiation dose of 200 k Gy,the tensile strength and T50 of pure NR are decreased by 75% and 4. 5 ℃,respectively. However,those of NR / RGO-0. 6% nanocomposites are decreased only by 56% and 1. 2 ℃,respectively. The radiation resistant mechanism of NR / RGO nanocomposites was also interpreted by electron paramagnetic resonance measurements. The results reveal that RGO can act as free radical scavenger,and the introduction of RGO to NR matrix exhibits much less amount of free radicals.