4.7 Article

Dielectric constant, dielectric loss, conductivity, capacitance and model analysis of electronic electroactive polymers

Related references

Note: Only part of the references are listed.
Review Polymer Science

Modeling and control of ionic polymer metal composite actuators: A review

Liang Yang et al.

Summary: This paper analyzes the main factors affecting the actuation performance of IPMC and describes three modeling techniques in detail: black box models, gray box models, and white box models. Then, five control methods of IPMC are analyzed and discussed, including proportional integral derivative control, adaptive control, sliding mode control, inverse control, and other control methods. Finally, the model and control of IPMC are summarized, and the future development direction is prospected.

EUROPEAN POLYMER JOURNAL (2023)

Article Nanoscience & Nanotechnology

Improved dielectric performance of polyvinylidene fluoride (PVDF) - Carbon dots composites

T. Aravinda et al.

Summary: The effects of carbon dot (C-dot) on AC conductivity and dielectric properties were investigated in polyvinylidene fluoride (PVDF)-C-dot nanocomposites. The interaction between PVDF and C-dot was confirmed by the observation of broadening peaks in XRD patterns. The synthesized samples exhibited improved dielectric constant and low-loss tangent, making them promising for electronic device applications.

PHYSICA E-LOW-DIMENSIONAL SYSTEMS & NANOSTRUCTURES (2023)

Article Materials Science, Characterization & Testing

Effects of effective voltages, electrode types and stretching states on electrical properties and actuation characteristics of dielectric elastomer materials

Hong Wang et al.

Summary: In this study, the electrical properties of DE materials were systematically tested, and the effects of different effective voltages, electrode types, and stretching states on various parameters were analyzed. The frequency dependence of the electric dipole in the material was investigated, and the actuation coefficient was proposed to characterize the deformation effect. The results showed that the permittivity, dielectric loss, and electric efficiency varied with different factors, such as frequency, electrode type, and stretching state.

POLYMER TESTING (2023)

Article Materials Science, Multidisciplinary

Effect of filler content on the dielectric properties of Ba1-xVxTiO3/PVDF composite flexible films

Juntao Xie et al.

Summary: The ceramic-polymer composite flexible films composed of BVT fillers and PVDF matrix were prepared using a solid-state reaction method. SEM tests showed that as the powder content increased, the film density and the interface effect between the polymer and powder decreased. The measurement results of the dielectric constant and dielectric loss of the film indicated that reducing the content of BVT powder could reduce the dielectric loss of the film under certain conditions.

MATERIALS LETTERS (2022)

Article Chemistry, Physical

Synchronously improved thermal conductivity and dielectric constant for epoxy composites by introducing functionalized silicon carbide nanoparticles and boron nitride microspheres

Lihua Zhao et al.

Summary: This research successfully prepares a dielectric thermally conductive composite with high thermal conductivity and superb dielectric properties by incorporating microscale boron nitride microspheres and nanoscale silicon dioxide coated silicon carbide nanoparticles. By capitalizing on the merits of different particles, favorable thermal conductivity and dielectric constant are achieved without compromising the dielectric loss.

JOURNAL OF COLLOID AND INTERFACE SCIENCE (2022)

Article Materials Science, Ceramics

Flexible BaTiO3/SiC@PbTiO3/epoxy composite films with enhanced dielectric performance at high frequency

Pengpeng Xu et al.

Summary: This work synthesizes a core-shell structured 1D filler by coating high-dielectric-constant PbTiO3 onto the surface of low-thermal-expansion-coefficient SiC nanofibers, which are then incorporated into the epoxy matrix together with BaTiO3 nanoparticles to form the multi-phase BaTiO3/SiC@PbTiO3/epoxy composite film. The composite material exhibits high dielectric constant and low dielectric loss.

CERAMICS INTERNATIONAL (2022)

Article Chemistry, Multidisciplinary

Influence of loading voltage, domain ratio, and additional load on the actuation of dielectric elastomer

Hong Wang et al.

Summary: This study analyzed the actuation performance of cone dielectric elastomer actuator and found that the output displacement and force of DEA increase with the increase of loading voltage and additional load. The design with different domain ratios is a key factor that influences the performance of DEA actuator.

NANOTECHNOLOGY REVIEWS (2022)

Article Robotics

Soft Robotic Gripper Based on Multi-Layers of Dielectric Elastomer Actuators

Witchuda Thongking et al.

Summary: Dielectric elastomer actuators (DEAs) are promising technology for soft robotics, with applications including grippers, artificial muscles, and heel strike generators. Multi-layered DEAs have the potential to be strong grippers, offering advantages such as light weight, fast response, and low cost.

JOURNAL OF ROBOTICS AND MECHATRONICS (2021)

Article Mechanics

Effect of viscoelasticity on the nonlinear dynamic behavior of dielectric elastomer minimum energy structures

Aman Khurana et al.

Summary: The dielectric elastomer minimum energy structure (DEMES) formed by attaching a pre-stretched dielectric elastomer (DE) membrane to a compliant frame exhibits both material and geometrical nonlinearity, significantly affecting the transient motion of the actuator. Analyzing the viscoelastic effect of the DE membrane on the DEMES dynamic behavior is crucial for efficient design, as revealed by the developed analytical model. The study predicts the delay in equilibrium state onset with increasing viscosity parameter, and demonstrates the significant impact of electric field and viscoelastic behavior on the bending angle of the DEMES actuator.

INTERNATIONAL JOURNAL OF SOLIDS AND STRUCTURES (2021)

Article Mechanics

Modeling of electro-viscoelastic dielectric elastomer: A continuum mechanics approach

Subrat Kumar Behera et al.

Summary: The study presents a rheological model for dielectric elastomeric materials, successfully capturing the electro-viscoelastic behavior with consideration of viscosity and electric field effects. The model, based on micro mechanics, shows good agreement with experimental results while using minimal material parameters.

EUROPEAN JOURNAL OF MECHANICS A-SOLIDS (2021)

Article Materials Science, Multidisciplinary

Electroless copper deposition and interface characteristics of ionic electroactive polymer

Liang Yang et al.

Summary: In this study, a cheap copper electrode IPMC was prepared by chemical deposition and its surface and cross section morphology, roughness, and porosity were analyzed. The interface profile was simulated using the WM function and the adhesion force of the interface was calculated, showing the positive impact of the copper layer on the performance of IPMC.

JOURNAL OF MATERIALS RESEARCH AND TECHNOLOGY-JMR&T (2021)

Article Chemistry, Multidisciplinary

Printing Reconfigurable Bundles of Dielectric Elastomer Fibers

Alex Chortos et al.

Summary: This study reports the 3D printing of core-sheath-shell dielectric elastomer fibers with programmable actuation, achieving complex shape morphing responses. These devices exhibit high resonance frequencies and long lifetimes, opening up new avenues for creating active soft matter with fast programmable actuation.

ADVANCED FUNCTIONAL MATERIALS (2021)

Article Materials Science, Multidisciplinary

Recent progress in preparation process of ionic polymer-metal composites

Liang Yang et al.

Summary: Ionic polymer-metal composite (IPMC) is a typical electroactive polymers material with great application potential. This paper briefly describes the deformation mechanism, fabrication technologies, challenges, and future development prospects of IPMC. It aims to promote the rapid application and development of IPMC through comprehensive consideration of various factors and the development of new preparation technologies.

RESULTS IN PHYSICS (2021)

Article Materials Science, Multidisciplinary

Permittivity, loss factor and Cole-Cole model of acrylic materials for dielectric elastomers

Hong Wang et al.

Summary: The dielectric properties of VHB4905 and VHB4910 were systematically measured and analyzed, revealing their sensitivity to frequency dependence and the effects of microstructure. High frequency orientation movement of polar groups was found to decrease the dielectric constant, while fitting correlation coefficients were high, providing insight for the design and control of dielectric elastomer actuators.

RESULTS IN PHYSICS (2021)

Article Materials Science, Multidisciplinary

Effect of different prestretching index and preloading on actuation behaviors of dielectric elastomer actuator

Hong Wang et al.

Summary: This study determined the prestretching indexes of dielectric elastomers through measuring tensile properties and discussed the actuation displacement and output force of the conical dielectric elastomer actuator with different prestretching index and preloading conditions. The study proposed three indexes to calculate the strain energy density of the actuator and found that a large prestretching ratio could cause instability in the dielectric elastomers. The Gent model was identified as better reflecting the nonlinear deformation behavior of the actuator.

JOURNAL OF MATERIALS RESEARCH AND TECHNOLOGY-JMR&T (2021)

Article Materials Science, Composites

Effect of polyhedral oligomeric silsesquioxanes with different structures on dielectric and mechanical properties of epoxy resin

Jianyu Qin et al.

Summary: By introducing three types of POSS, the dielectric constant and loss of EPs were significantly reduced. DOPOPOSS showed the best transparency, EPOSS exhibited excellent dispersion in the matrix, and OPS had lower dielectric loss in the high-frequency range.

POLYMER COMPOSITES (2021)

Article Chemistry, Physical

Comparison of the Dielectric Properties of Ecoflex(R) with L,D-Poly(Lactic Acid) or Polycaprolactone in the Presence of SWCN or 5CB

Patryk Fryn et al.

Summary: This study focused on studying the dielectric properties of hybrid binary and ternary composites based on the biodegradable polymer Ecoflex(R), SWCN, and 5CB. Results showed that SWCN did not affect the properties of Ecoflex(R) but led to conductivity in PCL and L,D-PLA. Increasing the SWCN content in the Ecoflex(R) matrix increased the dielectric constant, and the conductivity relaxation process became stronger.

MATERIALS (2021)

Article Engineering, Multidisciplinary

Proposal of a generic constitutive model for deformation-dependent dielectric constant of dielectric elastomers

Ajeet Kumar et al.

Summary: Dielectric elastomers are electroactive polymers used as soft actuators, stretchable generators, and sensors. The dielectric constant is dependent on the mechanical stretch, and different models have been evaluated for its characterization. A new inverse power-law relationship is proposed for a generalized and standardized characterization of the stretch-dependence of dielectric constant.

ENGINEERING SCIENCE AND TECHNOLOGY-AN INTERNATIONAL JOURNAL-JESTECH (2021)

Article Engineering, Manufacturing

Mussel-inspired polydopamine functionalized silicon carbide whisker for PVDF composites with enhanced dielectric performance

Xianwu Cao et al.

Summary: In this study, core-shell structured polydopamine functionalized silicon carbide whiskers were successfully synthesized to improve the dielectric properties of the composites. The presence of PDA effectively suppressed the dielectric loss, and the thicker PDA layer contributed to enhancing dielectric breakdown strength and reducing AC conductivity. This simple coated PDA shell strategy could be extended to develop high performance dielectric polymer composites with other inorganic fillers.

COMPOSITES PART A-APPLIED SCIENCE AND MANUFACTURING (2021)

Article Multidisciplinary Sciences

Analysis of Fractional-Order Models Of Polyaniline Doped Polyacrylonitrile Fibres Impedances' (PAN/PANI)

Tomasz Rybicki et al.

SCIENTIFIC REPORTS (2020)

Article Engineering, Manufacturing

High actuated performance MWCNT/Ecoflex dielectric elastomer actuators based on layer-by-layer structure

Zewang Xu et al.

COMPOSITES PART A-APPLIED SCIENCE AND MANUFACTURING (2019)

Article Chemistry, Multidisciplinary

Muscle-Inspired Highly Anisotropic, Strong, Ion-Conductive Hydrogels

Weiqing Kong et al.

ADVANCED MATERIALS (2018)

Review Chemistry, Physical

Flexible Graphene-Based Supercapacitors: A Review

W. K. Chee et al.

JOURNAL OF PHYSICAL CHEMISTRY C (2016)

Article Physics, Condensed Matter

Dielectric properties of Rhodamine-B and metal doped hydrogels

M. Okutan et al.

PHYSICA B-CONDENSED MATTER (2015)