Performance of PMMA-PnBA-PMMA dielectric film actuator with controllable phase morphology

Improved electromechanical properties of brominated butyl rubber filled with modified barium titanate

“…Several researchers tend to prepare and nd new DE materials with both high dielectric constant and low elastic modulus. 16,17 Yeonju Jang et al 18 investigated poly(methylmethacrylate) (PMMA)-b-poly(nbutylacrylate) (PnBA)-b-poly(methylmethacrylate) (PMMA) lms with cylindrical and lamellar morphologies, which were prepared with toluene and acetone casting solvents. The maximum strain of the toluene PMMA-PnBA-PMMA lm actuator was almost 12%, about 3 times larger than an acetone PMMA-PnBA-PMMA lm actuator.…”

Influence of Morphology and Rheological Properties on the Mechanical and Dielectric Behavior of Block Copolymer Gels

“…Similarly to the mechanical behavior, the morphology of a block copolymer affects its electrical response. As observed in other works, the dielectric constant was lower for the LAM morphology and, as the soft block prevails, this value increases for HEX and MIC morphologies.…”

“…When the reduction of the elastic modulus and the increase of the dielectric constant of these elastomers are achieved, they allow large deformations from an electric field . Among these, block copolymers (BCPs) have promising properties to be used as nanostructured dielectric elastomers …”

“…Jang and co‐workers demonstrated that HEX or BCC morphologies, with predominance of the softer block, present higher dielectric constants, in any frequency range studied, when compared to the LAM morphology, formed by alternating layers of the constituent blocks. In order to increase the predominance of the soft block, a strategy has been to prepare BCP physical gels, in which a large concentration of a low molecular weight compound selectively swells the soft block and the phase‐separated microdomains act as physical aggregates . Thus, in addition to increasing the dielectric constant, the gels allow the reduction of stiffness of the block copolymers, since the low molecular weight compound acts as a plasticizer in the system, achieving greater success for application as DEs.…”

Electroactive Thermoplastic Dielectric Elastomers as a New Generation Polymer Actuators

“…However, electroactive thermoplastic dielectric elastomer, sometimes referred to as electroactive nanostructured polymers (ENP), is a quite new terminology in the field of electroactive polymers (Chmidt et al, 2008;Jang et al, 2011;Kim et al 2010Kim et al , 2011Shankar et al, 2007aShankar et al, , 2007bShankar et al, , 2007cShankar et al, , 2008Vargantwar, 2011). Thus, this book www.intechopen.com will focus on demonstrating unique electric actuation properties of the thermoplastic dielectric elastomers.…”