碳纳米管结构对氟橡胶性能的影响

Effect of carbon nanotube structure on properties of fluororubber

选用多壁碳纳米管(CNTs)作为填料,研究了不同管壁厚度的CNTs对氟橡胶硫化特性、动态力学性能、力学性能、导电性能、压缩永久变形及导热性能的影响。结果表明,随着CNTs管壁厚度的减小,胶料的最小转矩(M_(L))和最大转矩(M_(H))增大,M_(H)-M_(L)增大,焦烧时间(t_(10))和正硫化时间(t_(90))增大,胶料的Payen效应减弱;胶料的硬度、拉伸强度、撕裂强度随着CNTs管壁厚度的减小而增大,拉断伸长率和压缩永久变形性能随之下降;随着CNTs管壁厚度的减小,胶料的导电性能和导热性能提高,拉曼(Raman)光谱分析结果表明,CNTs填充到氟橡胶后,G峰发生红移,说明其电子状态发生了改变,随着CNTs管壁厚度的减小,G峰红移增大,说明管壁厚度小的CNTs在氟橡胶中的电子状态发生了更大的变化,与氟橡胶产生了更强的相互作用,促进了CNTs的分散,从而提供了更有效的导电性和导热性。

The effects of multi-walled carbon nanotubes(CNTs)with different structures on the vulcanization characteristics,dynamic mechanical properties,mechanical properties,conductivity,compression set and the thermal conductivity of the fluorine rubber have been investigated.It was found that as tube wall thickness of CNTs decreased,the minimum torque(M_(L))and maximum torque(M_(H))of the rubber compound increased,and the scorch time(t_(10))and the positive vulcanization time(t_(90))also increased.As the thickness of CNTs decreased,the Payne effect decreased,which indicates that CNTs interact with the rubber more strongly.So the hardness,the tensile strength,the tear strength of the rubber were improved,but becaused of that,the elongation at break and compression set of the rubber decreased.CNTs with small wall thickness had a more positive effect on the conductivity and the thermal conductivity.Raman spectroscopy analysis results show that G band of CNTs was found to be red shifted when CNTs were filled in Fluororubber,which means that electronic states of CNTs had changed.The red shift of G band increased with tube wall thickness of CNTs decrease.It indicated that CNTs with small wall thickness had greater changes in electronic states in Fluororubber and had stronger interactions with Fluororubber,and it promoted the dispersion of CNTs in fluororubber,thus providing more efficient electrical and thermal conductivity.