Dynamic Dilution Effects in Polymeric Networks

Larsen, Anne Ladegaard; Sommer‐Larsen, Peter; Hassager, Ole

doi:10.1515/epoly.2006.6.1.555

Cited by 12 publications

(13 citation statements)

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“…The functionality, f , of the cross‐linker should be ≥3, in order to form a polymer network. The mechanical properties of a silicone network are governed primarily by the molecular weight of the PDMS chains, whereas the functionality of the cross‐linker is less significant for cross‐linkers with f > 4 and no steric hindrance . When very short polymers are cross‐linked, the silicone elastomer becomes glass‐like and brittle .…”

Section: Introductionmentioning

confidence: 99%

The Current State of Silicone-Based Dielectric Elastomer Transducers

Madsen

Daugaard

Hvilsted

et al. 2016

Macromol. Rapid Commun.

369

392

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Silicone elastomers are promising materials for dielectric elastomer transducers (DETs) due to superior properties such as high efficiency, reliability and fast response times. DETs consist of thin elastomer films sandwiched between compliant electrodes, and they constitute an interesting class of transducer due to their inherent lightweight and potentially large strains. For the field to progress towards industrial implementation, a leap in material development is required, specifically targeting longer lifetime and higher energy densities to provide more efficient transduction at lower driving voltages. In this review the current state of silicone elastomers for DETs is summarised and critically discussed, including commercial elastomers, composites, polymer blends, grafted elastomers and complex network structures. For future developments in the field it is essential that all aspects of the elastomer are taken into account, namely dielectric losses, lifetime and the very often ignored polymer network integrity and stability.Complete Manuscript

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Section: Introductionmentioning

confidence: 99%

The Current State of Silicone-Based Dielectric Elastomer Transducers

Madsen

Daugaard

Hvilsted

et al. 2016

Macromol. Rapid Commun.

369

392

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“…It is believed to be due to steric hindrance of the 80 crosslinker that the stoichiometry is so far from the ideality where r=1 should ensure the strongest network. It is, however, wellknown that a stoichiometry of r=1.1-1.3 usually gives the highest value of the elastic modulus 31 . The unimodal networks with lowest values of r are also extremely fragile and difficult to 85 handle due to low tear strength.…”

mentioning

confidence: 99%

Low moduli elastomers with low viscous dissipation

Bejenariu¹,

Yu²,

Skov³

2012

Soft Matter

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“…The washing procedure has a large influence on the resulting elastic properties since the removal of inelastic material results in an increased density of elastic material in the network sample. This effect is largest for the imperfect networks [115].…”

Section: Introductionmentioning

confidence: 92%

“…Another well-studied phenomenon [4][5][6]17,34] is the occurrence of dangling PDMS chains due to either lack of HMS reaction sites or reaction of stoichiometric amounts of mono-and difunctional DMS chains with HMS giving well-defined amounts of dangling material. Diffusion studies of linear PDMS chains in PDMS networks have been performed [21,35] to clarify the diffusion of unattached PDMS chains and thereby obtain an estimate for the characteristic time scales for the PDMS chains in the restricted network.…”

Section: Introductionmentioning

confidence: 99%

Some experimental results for the end-linked polydimethylsiloxane network system

Larsen

Sommer‐Larsen²,

Hassager

2004

E-Polymers

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Small-strain equilibrium modulus data of polydimethylsiloxane (PDMS) networks are reviewed. 58 different articles in the literature with values of the modulus of end-linked PDMS networks were found [1-58] including more than 250 values of the small-strain equilibrium modulus as function of variables in the crosslinking system. The dominating variable is shown to be the molecular weight of PDMS as expected, whereas the functionality of the crosslinker methylhydrosiloxane/dimethylsiloxane copolymer is shown to be less important in good agreement with the phantom model. The data collected was fitted to the phenomenological model of Langley and Graessley including an entanglement contribution. The fitted entanglement plateau (0.16 MPa) is in good agreement with literature values and with the theoretical prediction of the tube model. Experimental data for the Mooney-Rivlin constants was found and it was shown that C 2 is constant with increasing functionality. Furthermore it was found that trapped entanglements can be split into two categories, viz. locked entanglements contributing to the C 1 term and traditionally trapped entanglements contributing to C 2 .

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Dynamic Dilution Effects in Polymeric Networks

Cited by 12 publications

References 0 publications

The Current State of Silicone-Based Dielectric Elastomer Transducers

The Current State of Silicone-Based Dielectric Elastomer Transducers

Low moduli elastomers with low viscous dissipation

Some experimental results for the end-linked polydimethylsiloxane network system

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