Raman spectroscopy of pre-strained VHB 4910 elastomer towards actuator application

Sahu, Dhananjay; Sahu, Raj Kumar; Patra, Karali; Szpunar, Jerzy A.

doi:10.1016/j.vibspec.2019.102994

Cited by 2 publications

(2 citation statements)

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“…In the interpenetration technique, the prestrain applied for adjusting filler particles into the elastomer network is expected to source stress concentration at the filler‐matrix interface. In addition, the material behavior may severely change due to repositioning, reformation, and/or breaking of the intermolecular bonds in intrinsic structure 7 . Hence, recognition of the methods to fill the solid filler into VHB elastomer is found of great importance.…”

Section: Introductionmentioning

confidence: 99%

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In‐plane actuation performance of graphene oxide filled VHB 4910 dielectric elastomer

Sahu

Patra

2021

J of Applied Polymer Sci

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The effects of solid fillers on optical, electrical, mechanical, and electromechanical actuation behavior of VHB 4910 elastomer is inadequate, possibly due to readiness as a foam tape that makes the filler reinforcement a challenging work. VHB 4910 is modified by filling graphene oxide (GO) particles to realize the influences on material behavior towards actuator applications. The elastomer samples are ultrasonicated, swollen then thermochemically cured in GO dispersed; deionized‐water, trimethylolpropane trimethylacrylate (TMPTMA) and toluene to prepare three different filled‐elastomers. Material modification is confirmed by analyzing optical micrograph, and FTIR spectra. Whereas, dielectric constant and Young's modulus are assessed to ensure the feasibility of modified elastomers for electromechanical actuation strain. Amongst the three, GO‐TMPTMA filled‐elastomer samples are considered to test electromechanical actuation using an in‐house designed diaphragm actuator. Results showed enhanced in‐plane actuation performance and electrical breakdown strength, dependent on the curing time and prestrain. This work may strengthen the future strategies of making VHB 4910‐composite for dielectric elastomer actuator based electromechanical devices.

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Section: Introductionmentioning

confidence: 99%

“…In addition, the material behavior may severely change due to repositioning, reformation, and/or breaking of the intermolecular bonds in intrinsic structure. 7 Hence, recognition of the methods to fill the solid filler into VHB elastomer is found of great importance.…”

Section: Introductionmentioning

confidence: 99%

In‐plane actuation performance of graphene oxide filled VHB 4910 dielectric elastomer

Sahu

Patra

2021

J of Applied Polymer Sci

Self Cite

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Tailoring molecular structure and electromechanical properties of polydimethylsiloxane elastomer for enhanced energy conversion efficiency

Prabhakar,

Sahu

2024

Polymer Engineering & Sci

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The molecular structure of dielectric elastomers dictates their mechanical, electrical, and properties to react under external stimuli, influencing their suitability for applications such as actuators, sensors, and energy harvesting devices. The molecular structure of polymers can be tailored by incorporating plasticizers and particulate fillers to achieve multifunctional properties. However, achieving a balance between flexibility and maintaining mechanical strength due to incorporation of fillers induced phase separation and compromised intermolecular interactions remains challenging. In the present work, polydimethylsiloxane (PDMS) composites are synthesized using plasticizer and particulate fillers, polyethylene glycol (H‐(OCH2CH2)nOH) and titanium diboride (TiB2) respectively in various concentrations using shear mixing and doctor blade casting technique. Molecular structure of synthesized PDMS composite is confirmed by observing peaks of Raman spectra sift, which exhibits robust CO bonds dominating for both fillers. Chain entanglement due to filler incorporation significantly affects the crosslink density of PDMS composite, it increases with the concentration of plasticizer and possesses inverse relation for particulate. Furthermore, interdependence of the filler types and concentration are found on the mechanical as well as electrical properties. The specific deformation energy exhibits a significant increase of 118.9% when comparing particulate to the plasticizer at concentration of 8 wt.%. Although plasticizer increases the actuation strain and energy conversion efficiency but decreases the electrical breakdown voltage in comparison to particulate. By systematically varying fillers concentration, subtle changes in multifunctional properties are achieved. Overall, this investigation provides a framework for tailoring dielectric elastomer composites with desired electromechanical characteristics through the amalgamation of filler types and crosslinking densities, all intricately tied to the molecular architecture for electromechanical sensors.Highlights Filler incorporation changes DE molecular structure and materials properties. Formation of additional bonds and micro‐capacitors in DE enhances capacitance. Actuation strain in DE depends on filler type and concentration. Energy conversion efficiency varies with the concentration of filler.

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Raman spectroscopy of pre-strained VHB 4910 elastomer towards actuator application

Cited by 2 publications

References 50 publications

In‐plane actuation performance of graphene oxide filled VHB 4910 dielectric elastomer

In‐plane actuation performance of graphene oxide filled VHB 4910 dielectric elastomer

Tailoring molecular structure and electromechanical properties of polydimethylsiloxane elastomer for enhanced energy conversion efficiency

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