软质炭黑对天然橡胶基磁流变弹性体性能的影响

Effect of soft carbon black on properties of natural rubber-basedmagnetorheological elastomers

以天然橡胶为基体,使用软质炭黑和羰基铁粉制备了4种磁流变弹性体,探究了软质炭黑和磁性粒子含量对其性能的影响。使用场发射扫描电子显微镜观察其微观结构,采用电子式万能试验机和高级旋转流变仪观察分析其力学性能和磁流变效应。结果表明:软质炭黑的加入提高了磁流变弹性体的拉伸强度和300%的定伸拉力,改变了在低应变情况下磁流变弹性体的Mullins效应;羰基铁粉体积分数为30%的磁流变弹性体在添加软质炭黑后,其磁流变效应提高了3倍。因此,软质炭黑作为补强剂可以大幅提高磁流变弹性体的各项性能。

Using natural rubber as the matrix,four magnetorheological elastomers(MREs)were fabricated using soft carbon black and carbonyl iron powder.Their microstructures were observed by using the field emission scanning electron microscope(SEM),and their mechanical properties including magnetorheological(MR)effects were observed and analyzed by the electronic universal testing machine and the advanced rotational rheometer.Experimental results show that the addition of carbon black increases the tensile strength and 300%constant tensile force of MREs.Furmore the carbon black changes the Mullins effect of MREs under low strain conditions,and MREs with the carbonyl iron powder content of 30%volume fraction increased their MR effect by three times after the addition of carbon black.The performance of MREs can be improved greatly by using soft carbon black as a reinforcing agent.