Mechanical and Electrical Ageing Effects on the Long‐Term Stretching of Silicone Dielectric Elastomers with Soft Fillers

Madsen, Frederikke Bahrt; Zakaria, Shamsul Bin; Yu, Liyun; Skov, Anne Ladegaard

doi:10.1002/adem.201600074

Cited by 29 publications

(28 citation statements)

References 38 publications

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“…This broad applicability comes down to some of the main characteristics of dielectric elastomers, namely that they possess high extensibility, exibility and vanishing mechanical fatigue as well as high electrical and mechanical breakdown strengths. 17 As discussed in a recent review by Skov et al 18 on methodologies to improve the electro-mechanical properties of dielectric elastomers, methodologies fall under the following categories: (1) silicone composites, [19][20][21][22][23][24][25][26] (2) silicone/polymer blends, [27][28][29][30][31] (3) chemically modied silicones, [32][33][34][35] and (4) systems with a complex network structure. [36][37][38][39][40][41] Simply blending in functional polymers of various compositions, structures and/or molecular weights is an attractive approach because it is relatively simple to optimise and scale up.…”

Section: Introductionmentioning

confidence: 99%

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Enhancing the electro-mechanical properties of polydimethylsiloxane elastomers through blending with poly(dimethylsiloxane-co-methylphenylsiloxane) copolymers

Madsen

Boucher

et al. 2018

RSC Adv.

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In this work, improved electro-mechanical properties of silicone-based dielectric elastomers are achieved by means of adding so-called "voltage-stabilisers" prepared from phenyl-functional copolymers prepared using oxyanionic ring-opening polymerisation of octamethylcyclotetrasiloxane (D4) and either tetramethyltetraphenylcyclotetrasiloxane (T4) or octaphenylcyclotetrasiloxane (O4). The concentration of the voltage stabiliser was varied both by changing the molar ratio between methyl and phenyl groups in the copolymer and also by varying the amount of copolymer mixed into a PDMS-based elastomer. The phenyl-functional copolymers were generally found to disperse homogeneously in the PDMS matrix and this resulted in networks with improved mechanical and electrical properties. The developed elastomers were inherently extensible with enhanced tensile and tear strengths, due to phenyl-rich microphases acting as reinforcing domains. Furthermore, addition of phenyl-functional copolymers resulted in elastomers with increased relative permittivity and electrical breakdown strength compared to control elastomers while retaining a low dielectric loss. This demonstrates their efficiency as voltage stabilisers.a Phenyl content based on the added phenyl copolymer. b Residual mass fraction of the lm aer extraction and drying. c Mass fraction of the added phenyl copolymer. d Mass fraction of the phenyl copolymer in the extract, calculated from 1 H NMR. e Peak molecular weight of the early eluting peak. f Peak molecular weight relative to the late eluting peak.

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Section: Introductionmentioning

confidence: 99%

“…Dielectric elastomer stability is attracting a lot of attention, and various methods have been proposed recently. 28,29,[42][43][44] All these methods will easily detect phase separation since it will affect all properties largely.…”

Section: Introductionmentioning

confidence: 99%

Enhancing the electro-mechanical properties of polydimethylsiloxane elastomers through blending with poly(dimethylsiloxane-co-methylphenylsiloxane) copolymers

Madsen

Boucher

et al. 2018

RSC Adv.

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“…In general, high-permittivity oils are incompatible with silicone elastomers, and thus category (2) introduces some limitations with respect to ease of processing (and therefore cost) as well as long-term stability. [13][14][15] This leaves the choice of cheap materials for formulating elastomers with high permittivity matter.…”

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confidence: 99%

ZnO as a cheap and effective filler for high breakdown strength elastomers

Skov

2017

RSC Adv.

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Cheap, high-performance dielectric elastomers are in high demand from industry concerning new products based on dielectric elastomer transducers. However, formulating an elastomer that fulfils all the requirements for dielectric elastomers is difficult and, first and foremost, not cheap. In this article, we explore the use of a cheap and abundant metal oxide filler, namely ZnO, as a filler in silicone-based dielectric elastomers. The electro-mechanical properties of the elastomer composites are investigated, and their performance is evaluated by means of figures of merit. Various commercial silicone elastomers and a self-formulated silicone elastomer are utilised as elastomer matrices, the effects of which on the final properties of the elastomer composite are investigated.

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“…To our surprise, elastomers based on 30% with chloropropyl-functional PDMS oil were very stable over time when static pre-stretching. [74]…”

Section: Empirical Descriptions Of Blend System Figures Of Meritmentioning

confidence: 99%

Optimization Techniques for Improving the Performance of Silicone‐Based Dielectric Elastomers

Skov

2017

Adv Eng Mater

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Dielectric elastomers are possible candidates for realizing products that are in high demand by society, such as soft robotics and prosthetics, tactile displays, and smart wearables. Diverse and advanced products based on dielectric elastomers are available; however, no elastomer has proven ideal for all types of products. Silicone elastomers, though, are the most promising type of elastomer when viewed from a reliability perspective, since in normal conditions they do not undergo any chemical degradation or mechanical ageing/relaxation. Within this review, different pathways for improving the electro-mechanical performance of dielectric elastomers are highlighted. Various optimization methods for improved energy transduction are investigated and discussed, with special emphasis placed on the promise each method holds. The compositing and blending of elastomers are shown to be simple, versatile methods that can solve a number of optimization issues. More complicated methods, involving chemical modification of the silicone backbone as well as controlling the network structure for improved mechanical properties, are shown to solve yet more issues. From the analysis, it is obvious that there is not a single optimization technique that will lead to the universal optimization of dielectric elastomer films, though each method may lead to elastomers with certain features, and thus certain potentials.

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Mechanical and Electrical Ageing Effects on the Long‐Term Stretching of Silicone Dielectric Elastomers with Soft Fillers

Cited by 29 publications

References 38 publications

Enhancing the electro-mechanical properties of polydimethylsiloxane elastomers through blending with poly(dimethylsiloxane-co-methylphenylsiloxane) copolymers

Enhancing the electro-mechanical properties of polydimethylsiloxane elastomers through blending with poly(dimethylsiloxane-co-methylphenylsiloxane) copolymers

ZnO as a cheap and effective filler for high breakdown strength elastomers

Optimization Techniques for Improving the Performance of Silicone‐Based Dielectric Elastomers

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