Electromechanical response of polyol-polyurethane blends as dielectric elastomer flexible mirco-actuator material

Effect of polyhydric alcohols on the mechanical and thermal properties, porosities, and air permeabilities of polyurethane‐blended films

“…Broad bands at 2974 and 2850 cm −1 that correspond to the asymmetric and symmetric C‐H stretching vibrations of the CH 2 units were also observed. Medium‐intensity bands were observed at 1740, 1710, and 1711 cm −1 in the carbonyl region that arise from the C=O stretching vibrations of urea and urethane . The characteristic –NCO peak (2250–2275 cm −1 ) was not observed in the FTIR spectrum of the neat PU film.…”

“…Each polyhydric alcohol solution exhibited an absorption band at 3600–3300 cm −1 , which is attributable to O‐H (hydroxyl group) stretching vibrations. The strong peak in the 2930–2850 cm −1 region and the small peaks at ~1710 and 1740 cm −1 are associated with C‐H and C=O stretching vibrations, respectively, while absorption peaks at 1457–1300, 1246, 1116, and 1074 cm −1 that correspond to CH 2 , CH 2 , CH 2 , and C‐O‐C vibrations, respectively, were observed in the region below 1500 cm −1 . Meanwhile, the absorption peak at 2300 cm −1 corresponds to CO 2 in air and was observed during FTIR analyses.…”

“…Therefore, PEGs of different molecular weights act through different plasticization mechanisms that depend on polymer/plasticizer compatibility. Chen et al . prepared PU composite films using three polyols, namely glycerol, ethylene glycol, and triethylene glycol, in PU matrices by blending methods; these films were flexible dielectric‐elastomer micro‐actuating materials.…”

“…The presence of the polyol as a plasticizer in the chitosan and gelatin blended film was found to enhance the mobility of the polymer blend due to lower T m s (melting points) and T g s (glass‐transition temperatures), while the mechanical‐tensile strength and gas/water permeation rates were found to be proportional to the total plasticizer concentration. Chen et al . prepared a polyol‐PU blend and produced PU matrices with glycerol, ethylene glycol, and triethylene glycol as fillers.…”

A Facile Strategy to Enhance the Dielectric and Mechanical Properties of MWCNTs/PVDF Composites with the Aid of MMA-co-GMA Copolymer

“…With the development of the electronics industry, the fabrication of advanced dielectric composites is highly desirable for their applications. Polymer-based composites with excellent dielectric constant attracted intensive attention over the world, which can be used as embedded capacitors, electric actuators, and energy storage devices [ 1 , 2 , 3 , 4 , 5 , 6 , 7 ]. Poly (vinylidene fluoride) (PVDF) and its copolymers have been frequently used as a precursor to prepare dielectric materials due to their high dielectric constant, breakdown strength, thermal stability, and favorable flexibility [ 8 , 9 , 10 , 11 , 12 , 13 ].…”