Existence of Bound-Rubber in Magnetorheological Elastomers and Its Influence on Material Properties

Zhang, Xianzhou; Gong, Xinglong; Pei-qiang, Zhang; Li, Weihua

doi:10.1360/cjcp2007.20(2).173.7

Cited by 16 publications

(14 citation statements)

References 10 publications

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“…The shape of particles can also have influence on the MR effect, it is better if they have an asymmetric shape with the main axis of anisotropy [63]. Few works have reported positive effect of surface modification of particles on the growth of magnetorheological effect [68], although others show clearly that due to the better adhesion particle-matrix boundary region occurs and the ability of particles to move is reduced, which leads to a reduction of MR effect [69,70].…”

Section: The Rheological Properties and Magnetorheological Effect Of mentioning

confidence: 99%

Microstructure and Properties of Magnetorheological Elastomers

Boczkowska¹,

Awietjan²

2012

Advanced Elastomers - Technology, Properties and Applications

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Section: The Rheological Properties and Magnetorheological Effect Of mentioning

confidence: 99%

Microstructure and Properties of Magnetorheological Elastomers

Boczkowska¹,

Awietjan²

2012

Advanced Elastomers - Technology, Properties and Applications

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“…Gong et al [13] and Lokander and Stenberg [9] reported the advantageously influence on the MR effect of the addition of plasticizers to the silicon rubber due to the decrease of the polymer matrix stiffness. Jiang et al [14] indicate on the positive effect of the particles surface modification on the increase of the MR effect, while Zhang et al [15], Fan et al [16] and Li et al [17] show that the enhancement of the particle-polymer matrix interaction leads to the decrease of MR effect due to the existence of bound-rubber phenomenon. The improvement of filler-matrix interaction is an effective way to improve the mechanical properties of materials; however in the case of MREs it can affect the MR effect.…”

Section: Introductionmentioning

confidence: 99%

Effect of the elastomer stiffness and coupling agents on rheological properties of magnetorheological elastomers

Boczkowska

Awietjan

2011

WIT Transactions on Engineering Sciences

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The reported studies are related to a new group of intelligent materials, such as magnetorheological elastomers (MREs), which are composites of ferromagnetic particles embedded in elastomer matrix. Studies on fabrication of MREs were carried out using two different polyurethane elastomers as a matrix, ferromagnetic particles and coupling agent. The matrices were differed in elastomer stiffness and hardness. As a ferromagnetic component carbonyl-iron powder with particle size of 6-9 µm was used. Particles were oriented into chains under the external magnetic field of 240 kA/m. Samples with anisotropic particles arrangement and particles volume fraction equal to 11.5% were examined. Microstructure of MREs was observed using Scanning Electron Microscopy. Structural and magnetic anisotropy of the MREs was derived from the magnetic studies. Rheological properties of the MREs, such as storage and loss modulus and loss factor, were characterized as a function of shear frequency and strength of the magnetic field. Absolute and relative magnetorheological effects were calculated taking the microstructure into account, which was formed in the course of the MRE fabrication, by changing the elastomer type and application of the coupling agent. As a result of the studies it was found that the MREs with stiffer matrix exhibit much lower MR effect than the soft ones. Also the application of coupling agent lead to a decrease of MR effect by the formation of bound elastomer surrounding the particles, which increases the stiffness of the matrix.

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“…Moreover, at a critical stress level, debonding acts as a distinct failure phenomenon in an elastomer containing rigid inclusions, due to stress concentrations at the weak particle-matrix interface [11]. Therefore the phenomenon of debonding, bound and entrapped rubber appears as a key property for the behavior of filler-rubber compounds [12,13] and has actually been observed in MREs [14]. *tobias.possinger@cea.fr; phone +33 (0)1 69 08 02 39 Besides, the common use of silicone oil as a diluting agent to decrease the modulus of silicone elastomers tends to enhance by facilitating frictional sliding at the interfaces between the matrix and the particles [15][16][17][18].…”

Section: Introductionmentioning

confidence: 99%

5. Magnetorheological elastomers

2019

Smart Rubbers

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This work investigates the interfacial adhesion between the iron fillers and the silicone matrix in magneto-rheological elastomers at high deformations. Carbonyl iron powder, composed of mechanically soft spherical particles with a median size of 3.5 µm and a volume concentration of 3.5%, was mixed in a soft silicone matrix (Shore 00-20); the compound was then degassed and cured under temperature. The presence of a homogeneous magnetic field of 0.3 T during the curing process allowed the formation of particle chains. Tensile tests of these samples under scanning electron microscope showed interfacial slipping and debonding between the two phases. To improve interfacial adhesion, a silane primer was applied to the iron particles, following two different procedures, before the mixing and crosslinking process, thus giving two additional types of samples. In tensile testing lengthwise to the particle alignment, with engineering strains up to 150%, the structural responses of the different types of samples were compared. An enhanced adhesion of the iron fillers to the silicone matrix resulting in a reinforced matrix and increased tensile strength during the first loading path could be observed. Furthermore, scanning electron microscope images show that a more elaborated particle-matrix interface was obtained with the primer additive.

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Existence of Bound-Rubber in Magnetorheological Elastomers and Its Influence on Material Properties

Cited by 16 publications

References 10 publications

Microstructure and Properties of Magnetorheological Elastomers

Microstructure and Properties of Magnetorheological Elastomers

Effect of the elastomer stiffness and coupling agents on rheological properties of magnetorheological elastomers

5. Magnetorheological elastomers

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