Fully printable plasticized fluorinated terpolymers for mirror active morphing control

The use of plasticized P(VDF-TrFE-CFE), a relaxor ferroelectric polymer, has shown major improvements over the past few years. Dedicated to telescopes active optics actuators for the Live-Mirror project, the analysis of the plasticizer (here, DNOP) interaction with various polymer matrixes for high permittivity and softness is investigated here. Contrary to CTFE-based terpolymers, a large proportion of TrFE leads to plasticized films of low Young’s modulus (< 50MPa). Moreover, the amount of termonomer not only leads to a low crystalline fraction but also increases the number of amorphous – crystalline interfaces where it can accumulate and get trapped. Therefore, the obtention of large S33 of 2.5% at 30V/μm (here 6μm), measured by interferometry, vows great displacements for 4D-printed multilayer actuators.