三维泡沫状石墨烯/乙丙橡胶复合材料的制备及其性能

Preparation and properties of three-dimensional graphene foam/ethylene propylene rubber composites

为提高乙丙橡胶(EPR)的力学性能,由氧化石墨烯(GO)经过水热反应制备出大尺寸的三维泡沫状石墨烯(GF),然后将一定量的乙丙橡胶的氯仿溶液分别浇入不同量的GF中并将溶剂蒸干后,通过直接冷压和双螺杆挤出机制备出不同质量分数的三维泡沫状石墨烯/乙丙橡胶(GF/EPR)复合材料;采用扫描电镜(SEM)和透射电镜(TEM)对GF和复合材料结构进行表征,并考察了GF的添加量以及直接冷压和双螺杆挤出机两种加工方式对复合材料的力学性能影响.结果表明:GF的加入能显著提高复合材料的拉伸强度.当GF的质量分数小于1%时,通过冷压制备的材料拉伸强度和断裂伸长率提升明显.其中,GF的质量分数为0.5%,其拉伸强度提高了1.9倍,而且其断裂伸长率也增加了28.6%.当GF添加质量分数≥5%,经双螺杆挤出共混后,复合材料具有更高的拉伸强度,但是GF添加质量分数≤3%的复合材料的拉伸强度和断裂伸长率都下降很多.

In order to improve the mechanical properties of ethylene propylene rubber(EPR),large size three-dimensional graphene foam(GF)was prepared by hydrothermal reaction of graphene oxide.A certain amount of EPR chloroform solution was poured into different amount of GF,and the solvent was evaporated and dried.Then the GF/EPR composites with different mass fraction was prepared by cold pressing and twin screw extruder.The structure of GF and composite were characterized by scanning electron microscopy(SEM)and transmission electron microscopy(TEM).In addition,the effects of GF addition and different processing methods on the mechanical properties of the composite was investigated.Results indicated that GF can improve the tensile strength of the composites.When the content of GF is less than 1%,the tensile strength and elongation at break of the material prepared by the cold press increase significantly.Among them,the content of GF is 0.5%,the tensile strength of composite materials increased by 1.9 times,and its elongation at break also increased by 28.6%.Through the blending of twin screw extruder,the composites with the addition of GF≥5%have higher tensile strength,but the tensile strength and elongation at break of the composites with the addition of GF≤3%decreased a lot.