Lately, dielectric elastomers (DEs) which consist of an elastomer sandwiched between electrodes on both sides, have gained interest as materials for actuators, generators, and sensors. An ideal elastomer for DE uses is characterized by high extensibility, flexibility and good mechanical fatigue as well as high electrical and mechanical breakdown strengths.  Most model elastomers are prepared by an end-linking process using a crosslinker with a certain functionality f and a linear polymer with functional groups in both ends, and the resulting networks are so-called unimodal networks where unimodal refers to that there is one polymer only in the system. As an alternative to unimodal networks there are the bimodal networks where two polymers with significantly different molecular weights are mixed with one crosslinker. Silicone rubber can be divided into condensation type and addition type according to the curing reaction. The advantages of condensation silicones compared to addition are the relatively low cost, the curing rate largely being independent of temperature, the excellent adhesion, and the catalyst being nontoxic. In this work, a series of bimodal condensation silicone elastomers were prepared by mixing different mass ratios between long polydimethylsiloxane (PDMS) chains and short PDMS chains. The resulting elastomers were investigated with respect to their rheology, dielectric properties, tensile strength, electrical breakdown, thermal stability, as well as hydrophobicity and morphology.
|Number of pages||1|
|Publication status||Published - 2016|
|Event||6th International Conference on Electromechanically Active Polymer (EAP) Transducers & Artificial Muscles: 6th international conference - Helsingør, Helsingør, Denmark|
Duration: 14 Jun 2016 → 15 Jun 2016
|Conference||6th International Conference on Electromechanically Active Polymer (EAP) Transducers & Artificial Muscles|
|Period||14/06/2016 → 15/06/2016|
- Condensation silicone
- Dielectric properties
- Tensile sterngth
- Electrical breakdown
Yu, L., Madsen, F. B., & Skov, A. L. (2016). Bimodal condensation silicone elastomers as dielectric elastomers. Poster session presented at 6th International Conference on Electromechanically Active Polymer (EAP) Transducers & Artificial Muscles, Helsingør, Denmark.