Low moduli elastomers with low viscous dissipation

Bejenariu, Anca Gabriela; Yu, Liyun; Skov, Anne Ladegaard

doi:10.1039/c2sm25134e

Cited by 55 publications

(88 citation statements)

References 28 publications

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“…Stress was then calculated from the force assuming the incompressibility of the films. Dielectric relaxation spectroscopy (DRS) was performed on a Novocontrol Alpha-A high performance frequency analyser (Novocontrol Technologies GmbH & Co) operating in the frequency range 10 -1 -10 6 Hz at room temperature. The diameter of the tested 0.5-1 mm thick samples was 25 mm.…”

Section: Methodsmentioning

confidence: 99%

“…Attempts at decreasing the voltage have also been made by decreasing the Young's modulus. These efforts include solvent techniques 5 and bimodal networks 6,7 . Furthermore, several research studies have attempted to create improved DEs through a combination of decreased Young's modulus and an increased dielectric permittivity, in order to achieve a synergistic impact on lowering the driving voltage.…”

Section: Introductionmentioning

confidence: 99%

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Super soft silicone elastomers with high dielectric permittivity

Madsen

Hvilsted

et al. 2015

SPIE Proceedings

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Dielectric elastomers (DEs) have many favourable properties. The obstacle of high driving voltages, however, limits the commercial viability of the technology at present. Driving voltage can be lowered by decreasing the Young's modulus and increasing the dielectric permittivity of silicone elastomers. A decrease in Young's modulus, however, is often accompanied by the loss of mechanical stability and thereby the lifetime of the DE. New soft elastomer matrices with high dielectric permittivity and low Young's modulus, with no loss of mechanical stability, were prepared by two different approaches using chloropropyl-functional silicone polymers. The first approach was based on synthesised chloropropyl-functional copolymers that were cross-linkable and thereby formed the basis of new silicone networks with high dielectric permittivity (e.g. a 43% increase). These networks were soft without compromising other important properties of DEs such as viscous and dielectric losses as well as electrical breakdown strength. The second approach was based on the addition of commercially available chloropropyl-functional silicone oil to commercial LSR silicone elastomer. Two-fold increase in permittivity was obtained by this method and the silicone oil decreased the Young's modulus significantly. The viscous losses, however, also increased with increasing content of silicone oil. Cross-linkable chloropropyl-functional copolymers offer a new silicone elastomer matrix that could form the basis of dielectric elastomers of the future, whereas the chloropropyl silicone oil approach is an easy tool for improvement of the properties of existing commercial silicone elastomers.

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Section: Methodsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Super soft silicone elastomers with high dielectric permittivity

Madsen

Hvilsted

et al. 2015

SPIE Proceedings

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“…Unimodal refers to the polymer used in the preparation, which has a unimodal molecular weight distribution ensuring homogeneous distribution of the crosslinks. Details of the unimodal networks synthesis procedure have been explained in details elsewhere 20,21 .…”

Section: Preparation Of Different Silicone Networkmentioning

confidence: 99%

Front Matter: Volume 8340

Bar‐Cohen¹

2012

SPIE Proceedings

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The effect of different fillers on the mechanical and dielectric properties of soft elastomers has been investigated. It was found that the addition of a small amount of silica fillers would increase the Young's modulus significantly but not simultaneously increase the tear strength sufficiently for processing as thin films. Addition of nanoclay and barium titanate nanoparticles to the soft elastomers was shown to be very favorable for the enhancement of the dielectric properties without increasing the Young's modulus significantly and could be used for DEAP material in e.g. microprocessing where the tear strength is not crucial for processing. However, for elastomer film processing it is suggested that a combination of the nanoclay or barium titanate with either silica particles or bimodal networks would give the right tear strength together with the desired increased dielectric permittivity.

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“…So-called bimodal networks are prepared by a tedious synthesis procedure where small hyperbranched clusters are allowed to form before allowing the network to form. This reaction schema gives excellent tear strength as well as highly extensible elastomers [9][10] . However, in most commercial elastomer formulations silica particles are used to reinforce the elastomer.…”

Section: Introductionmentioning

confidence: 99%

Novel silicone elastomer formulations for DEAPs

2013

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We demonstrate that the force output and work density of polydimethylsiloxane (PDMS) based dielectric elastomer transducers can be significantly enhanced by the addition of high permittivity titanium dioxide nanoparticles which was also shown by Stoyanov et al [1] for pre-stretched elastomers and by Carpi et al for RTV silicones [2]. Furthermore the elastomer matrix is optimized to give very high breakdown strengths. We obtain an increase in the dielectric permittivity of a factor of approximately 2 with a loading of 12% TiO 2 particles compared to the pure modified silicone elastomer with breakdown strengths remaining more or less unaffected by the loading of TiO 2 particles. Breakdown strengths were measured in the range from approximately 80-150 V/μm with averages of the order of 120-130 V/μm for the modified silicone elastomer with loadings ranging from 0 to 12%.

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Low moduli elastomers with low viscous dissipation

Abstract: A controlled reaction schema for addition curing silicones leads both to significantly lower elastic modulus and lower viscous dissipation than for the chemically identical network prepared by the traditional reaction schema.

Cited by 55 publications

References 28 publications

Super soft silicone elastomers with high dielectric permittivity

Super soft silicone elastomers with high dielectric permittivity

Front Matter: Volume 8340

Novel silicone elastomer formulations for DEAPs

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