Increasing the Electrical Values of Polydimethylsiloxaneby the Integration of Carbon Black and Carbon Nanotubes:A Comparison of the Effect of Different Nanoscale Fillers.

Köckritz, Tilo; Wehnert, Franziska; Pap, József-Sebastian; Jansen, Irene

doi:10.11618/adhesion.51.221

Cited by 2 publications

(3 citation statements)

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“…Figure S4 shows the investigated storage and loss modulus vs. the angular frequency. Additional information is presented in [ 33 , 34 , 35 , 36 ].…”

Section: Resultsmentioning

confidence: 99%

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Full Polymer Dielectric Elastomeric Actuators (DEA) Functionalised with Carbon Nanotubes and High-K Ceramics

et al. 2016

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Dielectric elastomer actuators (DEA) are special devices which have a simple working and construction principle and outstanding actuation properties. The DEAs consist of a combination of different materials for the dielectric and electrode layers. The combination of these layers causes incompatibilities in their interconnections. Dramatic differences in the mechanical properties and bad adhesion of the layers are the principal causes for the reduction of the actuation displacement and strong reduction of lifetime. Common DEAs achieve actuation displacements of 2% and a durability of some million cycles. The following investigations represent a new approach to solving the problems of common systems. The investigated DEA consists of only one basic raw polymer, which was modified according to the required demands of each layer. The basic raw polymer was modified with single-walled carbon nanotubes or high-k ceramics, for example, lead magnesium niobate-lead titanate. The development of the full polymer DEA comprised the development of materials and technologies to realise a reproducible layer composition. It was proven that the full polymer actuator worked according to the theoretical rules. The investigated system achieved actuation displacements above 20% regarding thickness, outstanding interconnections at each layer without any failures, and durability above 3 million cycles without any indication of an impending malfunction.

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“…Figure S4 shows the investigated storage and loss modulus vs. the angular frequency. Additional information is presented in [ 33 , 34 , 35 , 36 ].…”

Section: Resultsmentioning

confidence: 99%

“…At first, a homogenous premix was built by using the dual asymmetric centrifuge. Subsequently, the deagglomeration and homogenisation was done by a stepwise processing at a three roll mill, produced by EXAKT Advanced Technologies GmbH (Norderstedt, Germany) [ 33 , 34 , 35 , 36 ].…”

Section: Methodsmentioning

confidence: 99%

Full Polymer Dielectric Elastomeric Actuators (DEA) Functionalised with Carbon Nanotubes and High-K Ceramics

et al. 2016

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“…Adhesive was prepared by dispersing 4 wt% carbon black (CB) (Ketjenblack EC-300 J, Akzo Nobel Functional Chemicals B.V., Arnhem, Netherlands) into a one-component polyurethane prepolymer (laboratory prototype 1506-PV, Jowat SE, Detmold, Germany) by using a dissolver (Dispermat CV-SIP, VMA-Getzmann GMBH, Reichshof, Germany). Compared to other electrically conductive nanofillers with strong agglomerates, CB only needs a good homogenisation (Köckritz et al 2015) and, in case of moisture curing 1C-PUR, other preparations. To prevent moisture uptake during preparation, the CB was dried to equilibrium at 103.5 °C and the dispersion process was performed under argon atmosphere.…”

Section: Sample Preparationmentioning

confidence: 99%

Piezoresistive bond lines for timber construction monitoring—experimental scale-up

et al. 2021

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Several laboratory studies and experiments have demonstrated the usability of polymer films filled with electrically conductive filler as piezoresistive material. Applied to adhesives, the glue lines of wood products can achieve multifunctional—thus bonding and piezoresistive/strain sensing—properties. Based on critical load areas in timber constructions, upscaled test setups for simplified load situations were designed, especially with regard to a stress-free electrical contact. In a second step, another upscaling was done to small glulam beams. Based on an experimental test sequence, the piezoresistive reactions as well as the behaviour until failure were analysed. The results show in all cases that a piezoresistive reaction of the multifunctionally bonded specimens was measurable, giving a difference in the extent of relative change. Additionally, measured phenomena like inverse piezoresistive reactions, electrical resistance drift and the absence of a piezoresistive reaction were discussed, based on additional strain analysis by digital image correlation. A model of macroscopic and microscopic strains influencing the piezoresistive reaction of the electrically conductive bond line in wood was used to explain all experimental results. Finally, a first scale-up of piezoresistive bond lines from laboratory samples to glulam beams was possible and successful.

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Increasing the Electrical Values of Polydimethylsiloxaneby the Integration of Carbon Black and Carbon Nanotubes:A Comparison of the Effect of Different Nanoscale Fillers.

Cited by 2 publications

References 1 publication

Full Polymer Dielectric Elastomeric Actuators (DEA) Functionalised with Carbon Nanotubes and High-K Ceramics

Full Polymer Dielectric Elastomeric Actuators (DEA) Functionalised with Carbon Nanotubes and High-K Ceramics

Piezoresistive bond lines for timber construction monitoring—experimental scale-up

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