The Normal Force Characteristic of a Novel Magnetorheological Elastomer Based on Butadiene Rubber Matrix Compounded with the Self-Fabricated Silly Putty

Fei Guo,Chengbin Du,Guojun Yu,Rotana Hay

doi:10.1155/2021/5831721

Abstract

In this paper, a novel magnetorheological elastomer (MRE) was prepared by dispersing carbonyl iron particles (CIPs) into a composite matrix compounded by butadiene rubber (BR) and self-fabricated Silly Putty. The rate-sensitive and magneto-induced characteristics of normal force were experimental investigated to discuss the working mechanism. The results demonstrated that the normal force increased with the compression rate and the mass fraction of boron-silicon copolymer added to the composite matrix due to the formation of the more and more B-O cross bonds which could be blocked in the C-C cross-linked network of BR. Meanwhile, the magneto-induced normal force was positively correlated with the applied magnetic field strength and the compression strain due to the decreased gap between the centers of soft magnetic particles and the increased particle intensity of magnetization. Moreover, the magneto-induced normal force continued to enhance with the increase of compression strain because the CIP chains fixed in the C-C cross-linked network could bend to a radian and CIP chains in B-O cross-linked network could rupture to form more stable and intensive short-chain structures. Besides, a simplified model was deduced to characterize the mechanism of the generation of the magneto-induced normal force. Furthermore, the normal force varied stably with the oscillatory shear strain (less than 9%) at different magnetic induction intensities and suddenly reduced when the applied oscillatory shear strain was more than 9%.

Highlights

Magnetorheological elastomer (MRE) is an intelligent material by dispersing micron-sized carbonyl iron particles (CIPs) into traditional rubber or thermoplastic matrix uniformly [1,2,3]
As for the fabricated four groups of the novel MRE samples from MRE-1 to MRE-4, Figure 5 shows the relationship between the normal force FN and the gap h of parallel plates at the same compression rate of 100 μm/s
A novel MRE based on composite matrix compounded by butadiene rubber (BR) and self-fabricated Silly Putty was prepared. e normal force of MRE samples at quasi-static compression mode without magnetic field, quasi-static compression mode with the magnetic field, and dynamic oscillation shear mode were tested

Summary

Introduction

Magnetorheological elastomer (MRE) is an intelligent material by dispersing micron-sized carbonyl iron particles (CIPs) into traditional rubber or thermoplastic matrix uniformly [1,2,3]. Different applied magnetic field strengths can control the dynamic mechanical properties such as the obtained MRE’s storage modulus and damping factor [4, 5]. Due to the contradiction between the magnetorheological effect and mechanical properties induced by cross-linking degree of polymer rubber matrix [19], it is challenging to obtain MRE samples with excellent magnetorheological effect. Vertical extrusion deformation is limited; the tiny deformation can produce an excellent output strength. Erefore, it is essential to study the mechanical properties and magnetorheological effect of MRE in extrusion mode Vertical extrusion deformation is limited; the tiny deformation can produce an excellent output strength. erefore, it is essential to study the mechanical properties and magnetorheological effect of MRE in extrusion mode

Methods

Results

Conclusion