Characterization of the vibrational damping loss factor and viscoelastic properties of ethylene–propylene rubbers reinforced with micro‐scale fillers

Kwak, Gun-Ho; Inoue, Kenji; Tominaga, Yoichi; Asai, Shigeo; Sumita, Masao

doi:10.1002/app.2161

Cited by 34 publications

(23 citation statements)

References 35 publications

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“…The tan d so obtained is the ratio of loss modulus to storage modulus and provides a measure of energy dissipated to energy stored during dynamic deformation 14 . As shown in the Fig.…”

Section: Discussionmentioning

confidence: 99%

Hybrid carbon nanotube yarn artificial muscle inspired by spider dragline silk

et al. 2014

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Torsional artificial muscles generating fast, large-angle rotation have been recently demonstrated, which exploit the helical configuration of twist-spun carbon nanotube yarns. These wax-infiltrated, electrothermally powered artificial muscles are torsionally underdamped, thereby experiencing dynamic oscillations that complicate positional control. Here, using the strategy spiders deploy to eliminate uncontrolled spinning at the end of dragline silk, we have developed ultrafast hybrid carbon nanotube yarn muscles that generated a 9,800 r.p.m. rotation without noticeable oscillation. A high-loss viscoelastic material, comprising paraffin wax and polystyrene-poly(ethylene-butylene)-polystyrene copolymer, was used as yarn guest to give an overdamped dynamic response. Using more than 10-fold decrease in mechanical stabilization time, compared with previous nanotube yarn torsional muscles, dynamic mirror positioning that is both fast and accurate is demonstrated. Scalability to provide constant volumetric torsional work capacity is demonstrated over a 10-fold change in yarn cross-sectional area, which is important for upscaled applications.

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“…The tan d so obtained is the ratio of loss modulus to storage modulus and provides a measure of energy dissipated to energy stored during dynamic deformation 14 . As shown in the Fig.…”

Section: Discussionmentioning

confidence: 99%

Hybrid carbon nanotube yarn artificial muscle inspired by spider dragline silk

et al. 2014

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“…The ratio E 00 =E 0 is the loss tangent (tan d), which is the ratio of energy loss per cycle to the maximum energy stored per cycle. [3] The dynamic mechanical properties of the polyurethane= ZnO nanoparticle composites are illustrated in Figs. 5 to 9 and in all samples the molar ratio of PPG: TDI is 1:1.6.…”

Section: Dynamic Mechanical Propertiesmentioning

confidence: 99%

“…The damping behavior of polymers is due to (a) intramolecular friction and molecular relaxation, (b) friction between polymer chain and filler, (c) friction between filler and filler, and (d) deformation of microbulbs in cellules and the nature of polymers [1][2][3][4][5][6][7][8][9][10][11] . The capability relates to the intensity and broadness of the loss modulus (E 00 ) or loss tangent (tan d) peaks at the applying temperature.…”

Section: Introductionmentioning

confidence: 99%

Preparation and Characterization of Polyurethane/ZnO Nanoparticle Composites

Guo

Zheng

Zhu

et al. 2007

Polymer-Plastics Technology and Engineering

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The polyurethane/ZnO nanoparticle composites were prepared by in situ suspension polymerization. FT-IR results indicated that hydroxy groups on the ZnO nanoparticles reacted with isocyanate groups, which could improve the compatibility between ZnO nanoparticles and polyurethane to give better properties of nanocomposites. The polyurethane/ZnO nanoparticle composites showed the excellent tensile break strength. The effect of the ZnO nanoparticles on the damping properties were investigated by dynamic mechanical thermal analysis (DMTA). The nanoparticles affected the damping behaviors and significantly increased the values of the tan d. The main reason was the significant formation of ''coreshell'' structure in the matrix.

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“…Vassileva and Friedrich [15] determined the interphase thickness of various epoxy and treated alumina nanoparticle systems from measurement of the damping factor, tan d of nanocomposite systems. Kwak et al [16] experimentally investigated the influence of micro scale fillers on damping capacity of ethylene-propylene rubber. Addition of fillers to a polymeric matrix tends to decrease tan d of the composite.…”

Section: Introductionmentioning

confidence: 99%

Damping Behavior of Alumina Epoxy Nano-Composites

Katiyar

Kumar

2016

J. Inst. Eng. India Ser. C

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Polymer nano composites, consisting of a polymer matrix with nanoparticle filler, have been predicted to be one of the most beneficial applications of nanotechnology. Addition of nano particulates to a polymer matrix enhances its performance by capitalizing on the nature and properties of the nano-scale fillers. The damping behavior of composites with nano structured phases is significantly different from that of micro structured materials. Viscoelastic homopolymer exhibit a high material damping response over a relatively narrow range of temperature and frequencies. In many practical situations, a polymeric structure is required to possess better strength and stiffness properties together with a reasonable damping behavior. Viscoelastic polymers show higher loss factor beyond the glassy region which comes with a significant drop in the specific modulus. Addition of nano alumina particles to epoxy leads to improved strength and stiffness properties with an increase in glass transition temperature while retaining its damping capability. Experimental investigations are carried out on composite beam specimen fabricated with different compositions of alumina nano particles in epoxy to evaluate loss factor, tan d. Impact damping method is used for time response analysis. A single point Laser is used to record the transverse displacement of a point on the composite beam specimen. The experimental results are compared with theoretical estimation of loss factor using Voigt estimation. The effect of inter phase is included in theoretical estimation of loss factor. The result reveals that the study of interface properties is very important in deriving the overall loss factor of the composite since interface occupies a significant volume fraction in the composite.

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Characterization of the vibrational damping loss factor and viscoelastic properties of ethylene–propylene rubbers reinforced with micro‐scale fillers

Cited by 34 publications

References 35 publications

Hybrid carbon nanotube yarn artificial muscle inspired by spider dragline silk

Hybrid carbon nanotube yarn artificial muscle inspired by spider dragline silk

Preparation and Characterization of Polyurethane/ZnO Nanoparticle Composites

Damping Behavior of Alumina Epoxy Nano-Composites

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