电泳沉积母胶法碳纳米管/天然橡胶复合材料的性能研究

Properties of CNTs/NR Composites by Electrophoretic Deposition Masterbatch Method

用氢氧化钠和过氧化氢改性碳纳米管(CNTs)得到氧化CNTs(OCNTs),再用硅烷偶联剂KH-550改性OCNTs得到氮掺杂CNTs(NCNTs)。采用电泳沉积法制备CNTs/天然橡胶(NR)、OCNTs/NR和NCNTs/NR母胶后,再用机械共混法制得CNTs/NR复合材料,将其与直接采用机械共混法制得的CNTs/NR复合材料进行性能对比。结果表明:电泳沉积法能够使CNTs在NR中均匀分散,提高CNTs/NR复合材料的热稳定性;OCNTs/NR复合材料的300%定伸应力和拉伸强度最大,热稳定性最好,但生热和滚动阻力较高;NCNTs/NR复合材料的300%定伸应力和拉伸强度较大,抗湿滑性能最好,生热和滚动阻力最低,综合性能最好。

In this study,oxidized carbon nanotubes(OCNTs)were obtained by modification of CNTs with sodium hydroxide and hydrogen peroxide,and nitrogen-doped CNTs(NCNTs)were prepared by further modification of OCNTs with silane coupling agent KH-550.Then,the CNTs/natural rubber(NR),OCNTs/NR and NCNTs/NR masterbatches were prepared by the electrophoretic deposition method,and the CNTs/NR composites were produced by mechanical blending.The properties of these composites were compared with those of the CNTs/NR composites prepared directly by mechanical blending.The results showed that,CNTs were evenly dispersed in NR by electrophoretic deposition,which improved the thermal stability of the CNTs/NR composites.Among all the studied composites,OCNTs/NR composites had the highest tensile stress at 300%elongation and tensile strength,the best thermal stability,but possessed higher heat build-up and rolling resistance.NCNTs/NR composites had the best overall performance:higher tensile stress at 300%elongation and tensile strength,the best wet skid resistance,the lowest heat build-up and rolling resistance.