氧化石墨烯增强多孔结构磁性天然橡胶的制备及性能研究

Preparation and properties of graphene oxide reinforcedporous magnetic natural rubber

磁性橡胶具有优异的磁控力学性能,在军事、医疗等领域具有广泛的应用前景。然而,磁性橡胶面临的磁流变效应较低且与机械力学性能相矛盾的难题,极大地阻碍了其工程化应用。为此,采用机械共混法,选取羰基铁粉为磁性粒子,制备了GO含量分别为0 phr、0.5 phr、0.8 phr、1.1 phr和1.4 phr的多孔结构磁性天然橡胶(PMR),并对其微观形貌、磁性能、磁流变性能和机械力学性能进行了系统研究。结果表明,PMR具有圆形闭孔的多孔结构,该结构特征的基体弹性模量较低,利于基体中的磁性粒子在磁场作用下沿磁场方向移动,从而使PMR具有高磁流变效应。随着GO含量的上升,PMR的拉伸强度先升高后降低,当GO含量为0.8 phr时,PMR孔洞壁的破洞现象最少、拉伸强度最大(5.02 MPa)且磁流变效应较高(422%)。适量GO的掺杂不仅完善了PMR的孔洞结构,而且提升了其机械力学性能,发挥了补强剂的作用。该研究为设计并制备具有高磁流变效应和优异机械力学性能的磁性橡胶提供了新思路。

Magnetic rubber has been widely used in military and medical fields because of its excellent properties of magnetic-induced damping and magnetic-induced mechanics.However,the low magnetorheological effect and the contradiction between magnetorheological effect and mechanical properties of magnetic rubber has greatly hindered its engineering application.Therefore,porous magnetic natural rubber(PMR)with GO content of 0 phr,0.5 phr,0.8 phr,1.1 phr and 1.4 phr were prepared by mechanical blending method.The micro-morphology,magnetic properties,magnetic rheological properties and mechanical properties of PMR were studied systematically.The results show that PMR has a circular closed porous structure,and the matrix elastic modulus of the structure is low,which is conducive to the magnetic particles in the matrix to move along the direction of the magnetic field under the action of the magnetic field,so that PMR has the high magnetorheological effect.With the increase of GO content,the tensile strength of PMR first increases and then decreases.When GO content is 0.8 phr,the hole wall breakage of PMR is the least,the tensile strength is the largest(5.02 MPa)and the magnetorheological effect is higher(422%).Proper amount of GO doping not only improves the pore structure of PMR,but also improves its mechanical properties and plays the role of reinforcing agent.This study provides a new idea for designing and preparing magnetic rubber with high magnetorheological effect and excellent mechanical properties.