Novel cross-linkers for PDMS networks for controlled and well distributed grafting of functionalities by click chemistry

Madsen, Frederikke Bahrt; Dimitrov, Ivaylo; Daugaard, Anders Egede; Hvilsted, Søren; Skov, Anne Ladegaard

doi:10.1039/c2py20966g

Cited by 76 publications

(79 citation statements)

References 34 publications

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“…[17] Polymer viscosity, filler type and filler quantity will affect the tensile strength, maximum elongation and toughness of the cured silicone. From a transducer point of view LSRs should possess high dielectric permittivity, little dielectric loss, high tear strength, large elongation at the break, a low Young's modulus (in the case of an actuator), little viscous dissipation and the films should be perfectly homogeneous.…”

Section: Introductionmentioning

confidence: 99%

Silicone rubbers for dielectric elastomers with improved dielectric and mechanical properties as a result of substituting silica with titanium dioxide

Skov

2015

International Journal of Smart and Nano Materials

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Section: Introductionmentioning

confidence: 99%

Silicone rubbers for dielectric elastomers with improved dielectric and mechanical properties as a result of substituting silica with titanium dioxide

Skov

2015

International Journal of Smart and Nano Materials

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“…Much focus has, therefore, during recent years been on increasing the dielectric permittivity of silicone DEs. Increased dielectric permittivity leads to increased elastomer energy density and thereby an increased strain at a given voltage can be obtained 3,4 . Large increases in dielectric permittivity have most often been accomplished through the use of metal oxide fillers creating silicone elastomer composites.…”

Section: Introductionmentioning

confidence: 99%

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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“…Increasing attention is also attracted towards grafting of polar molecules onto the silicone polymer backbone which significantly improves the dielectric permittivity without compromising its high inherent breakdown strength and increasing dielectric loss [4]. It was also reported that grafting of less than 0.5 wt.% of push-pull dipols onto a crosslinker of the silicones can enhance the dielectric constant by 19% [5,6].…”

Section: Introductionmentioning

confidence: 99%

Novel encapsulation technique for incorporation of high permittivity fillers into silicone elastomers

2014

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The research on soft elastomers with high dielectric permittivity for the use as dielectric electroactive polymers (DEAP) has grown substantially within the last decade. The approaches to enhance the dielectric permittivity can be categorized into three main classes: 1) Mixing or blending in high permittivity fillers, 2) Grafting of high permittivity molecules onto the polymer backbone in the elastomer, and 3) Encapsulation of high permittivity fillers. The approach investigated here is a new type of encapsulation which does not interfere with the mechanical properties to the same content as for the traditionally applied thermoplastic encapsulation. The properties of the elastomers are investigated as function of the filler content and type. The dielectric permittivity, dielectric loss, conductivity, storage modulus as well as viscous loss are compared to elastomers with the same amounts of high permittivity fillers blended into the elastomer, and it is found that the encapsulation provides a technique to enhance some of these properties.

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Novel cross-linkers for PDMS networks for controlled and well distributed grafting of functionalities by click chemistry

Cited by 76 publications

References 34 publications

Silicone rubbers for dielectric elastomers with improved dielectric and mechanical properties as a result of substituting silica with titanium dioxide

Silicone rubbers for dielectric elastomers with improved dielectric and mechanical properties as a result of substituting silica with titanium dioxide

Super soft silicone elastomers with high dielectric permittivity

Novel encapsulation technique for incorporation of high permittivity fillers into silicone elastomers

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