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Polyurethanes (PU) have demonstrated their ability to convert electrical energy into mechanical energy and vice versa. The incorporation into a PU matrix of nanofillers, such as carbon nanotubes (CNT), can even enhance the actuation and the harvested energy performances. However, it is well known that CNTs are hardly dispersed in a polymeric matrix, and that the interfacial adhesion strength is generally...
The paper deals with electromechanical and dielectric properties of polyurethanes (PU) block-copolymers. Most of the works published in the literature only consider electrostriction at room temperature at a given frequency. In this work, it is shown that electrostrictive coefficient M E is divided by 3–10 at increasing frequency over 3 decades of frequency, depending on the ratio of hard to...
Polyurethane (PU) exhibit very high electromechanical activity, and has a great interest for a wide range of transducer and actuator applications. It has been recently pointed out that this strong electrostriction may result from the phase separation. In the present work, a model taking account the PU nanostructure is presented. In order to validate this model, three PUs of similar compositions but...
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