Integration of SMP with PVDF Unimorph for Bending Enhancement

Kalel, Sudarshan; Wang, Wei‐Chih

doi:10.3390/polym13030415

Cited by 7 publications

(8 citation statements)

References 20 publications

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“…An interesting design approach of segmented unimorph is shown in [6] where cross braces are used to force the movement of the actuator to the desired direction thereby creating a tiny walking soft robot. [7] shows also that the unimorph configuration is not limited to classic DE films like silicone or acrylic. The authors use a PVDF piezoelectric polymer for the unimorph configuration and [8] uses a combination of PVDF-TrFe-CTFEr which leads also to outstanding high bending performance.…”

Section: Introductionmentioning

confidence: 93%

High-performance dielectric elastomer unimorph bending actuators without pre-stretch

Ehrlich

Löschke

Böse

2023

Electroactive Polymer Actuators and Devices (EAPAD) XXV

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Dielectric elastomer (DE) single films for bending actuators are normally used with pre-stretch to increase the performance of the actuation. However, pre-stretch requires a high effort in the production of the actuators. In this work, a simple DE bending actuator in a unimorph configuration with high actuation performance is presented. For the manufacturing of the actuator, a silicone film is coated with conductive carbon nanoparticles in a silicone matrix as electrodes on both sides and laminated with a non-stretchable, but highly bendable and light weight polymer film, which acts as a strain limiting layer. Stiffening bars on the strain limiting layer impede an uncontrolled actuator deformation. The bending angle and the displacement of the actuator tip were measured at variable field strength up to 80 kV/mm. In a single DE layer configuration with an electrode area of 50 mm x 30 mm, a bending angle of 15° and a tip displacement of 7 mm were reached. A mathematical model for the bending actuator was applied to compare experimental and theoretical results and to optimize the relevant parameters. By using thermoplastic polyurethane (TPU) as an alternative elastomer material, a bending angle of 40° and a tip displacement of 18 mm could be achieved with the same actuator dimensions and optimized parameters. The simple unimorph bending actuators are promising tools for sensitive grippers on soft robots.

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Section: Introductionmentioning

confidence: 93%

High-performance dielectric elastomer unimorph bending actuators without pre-stretch

Ehrlich

Löschke

Böse

2023

Electroactive Polymer Actuators and Devices (EAPAD) XXV

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“…Further, the generated heat can be used to increase the maximum bending of the actuator. The shape memory polymer layer length and mounting location influence the bending motion of the actuator, and the use of an equal layer of PVDF at the center of the actuator results in a bending angle increase to 40° when compared to the bending resulting from the piezo bending (4°) at 20 V.μm –1 . Different cantilever PVDF-based actuators have also been developed, displaying the Scotch tape-PVDF-SMP layer-based actuator the highest bending performance, as summarized in Table .…”

Section: Applicationsmentioning

confidence: 99%

Smart and Multifunctional Materials Based on Electroactive Poly(vinylidene fluoride): Recent Advances and Opportunities in Sensors, Actuators, Energy, Environmental, and Biomedical Applications

Costa,

Cardoso,

Martins

et al. 2023

Chem. Rev.

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From scientific and technological points of view, poly(vinylidene fluoride), PVDF, is one of the most exciting polymers due to its overall physicochemical characteristics. This polymer can crystalize into five crystalline phases and can be processed in the form of films, fibers, membranes, and specific microstructures, being the physical properties controllable over a wide range through appropriate chemical modifications. Moreover, PVDF-based materials are characterized by excellent chemical, mechanical, thermal, and radiation resistance, and for their outstanding electroactive properties, including high dielectric, piezoelectric, pyroelectric, and ferroelectric response, being the best among polymer systems and thus noteworthy for an increasing number of technologies. This review summarizes and critically discusses the latest advances in PVDF and its copolymers, composites, and blends, including their main characteristics and processability, together with their tailorability and implementation in areas including sensors, actuators, energy harvesting and storage devices, environmental membranes, microfluidic, tissue engineering, and antimicrobial applications. The main conclusions, challenges and future trends concerning materials and application areas are also presented.

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“…The RFE makes switching from polar phase into the non-polar phase easier to achieve larger mechanical deformation and improves dielectric properties. Composite approaches have also been attempted to alter pure PVDF's electrical and physical properties by researchers [7][8][9][10]. Accurate information about the dielectric properties of these polymers holds great importance for the design of flexible electronic, light-wave manipulation, and solar devices.…”

Section: Introductionmentioning

confidence: 99%

Optical properties of PVDF-TrFE and PVDF-TrFE-CTFE films in terahertz band

Kalel

Wang

2023

Mater. Res. Express

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Polymers have enormous potential in the optoelectronic and biomedical fields due to flexibility, biocompatibility, and ease of fabrication. Recent developments in the use of terahertz (THz) waves for biomedical and security applications demand information on the optical properties of the polymers and polymer composites in this region. In the present work, transmission, refractive index (n), and extinction coefficient (k) of PVDF-TrFE (75/25 mol.) copolymer and PVDF-TrFE-CTFE (73/23/4 mol.) terpolymer films with different thicknesses (40 µm, 60 µm, 80 µm) are measured by the THz-TDS system (up to 1 THz). PVDF copolymer and terpolymer films show average transmission of more than 90% irrespective of thickness. The average refractive index of PVDF-TrFE (75/25 mol.) copolymer and PVDF-TrFE-CTFE (73/23/4 mol.) terpolymer films are 1.50±0.04 and 1.45±0.05 respectively. The estimated extinction coefficient is considerably low for both polymer films for frequencies less than 0.6 THz. The average indices for PVDF-TrFE and PVDF-TrFE-CTFE films are close, however, the loss in PVDF-TrFE films is larger than the PVDF-TrFE-CTFE films. High transmission, low loss and ferroelectric properties make these PVDF based polymers highly desirable in light-wave manipulation, flexible electronic and solar devices.

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Integration of SMP with PVDF Unimorph for Bending Enhancement

Cited by 7 publications

References 20 publications

High-performance dielectric elastomer unimorph bending actuators without pre-stretch

High-performance dielectric elastomer unimorph bending actuators without pre-stretch

Smart and Multifunctional Materials Based on Electroactive Poly(vinylidene fluoride): Recent Advances and Opportunities in Sensors, Actuators, Energy, Environmental, and Biomedical Applications

Optical properties of PVDF-TrFE and PVDF-TrFE-CTFE films in terahertz band

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