Inkjet printed micropump actuator based on piezoelectric polymers: Device performance and morphology studies

The use of constitutive equations to describe the electro-mechanical behavior of electrostrictive materials began over 100 years ago. While these equations have been used to model a host of ceramic-based and polymer-based electroactive materials, a fully-characterized model has not yet been developed to predict the response of transversely-isotropic polymer electrostrictives. A constitutive model is developed within a thermodynamic and hyperelastic framework that incorporates the transversly-isotropic material symmetry that is present in many polymer-based electrostrictives. The resulting constitutive model is characterized for three electrostrictive polymer systems using empirical data that is available in the literature. The model has a relatively simple functional form that is easily adaptable to other polymer electrostrictive material systems.

/pdf/constitutive-modeling-of-electrostrictive-polymers-using-a-4110mtqkcq.pdf

Constitutive Modeling of Electrostrictive Polymers using a Hyperelasticity-Based Approach

In-situ electron microscopy investigation of ferroelectric domain switching kinetics

All inkjet-printed piezoelectric polymer actuators: Characterization and applications for micropumps in lab-on-a-chip systems

Greatly enhanced energy density in poly(vinylidene fluoride-chlorotrifluoroethylene) [P(VDF-CTFE)] is realized through interface effects induced by a photo cross-linking method. Being different from nanocomposites with lowered dielectric strength, the cross-linked P(VDF-CTFE)s possess a high breakdown field as well as remarkably elevated polarization, both of which contribute to the enhanced energy density as high as 22.5 J · cm -3 . Moreover, patterned thin films with various shapes and sizes are fabricated by photolithography, which sheds new light on the integration of PVDF-based electroactive polymers into organic microelectronic devices such as flexible pyroelectric/piezoelectric sensor arrays or non-volatile ferroelectric memory devices.

Greatly enhanced energy density and patterned films induced by photo cross-linking of poly(vinylidene fluoride-chlorotrifluoroethylene).

The relaxor ferroelectric polymer, based on poly(vinylidene fluoride-trifluoroethylene- chlorofluoroethylene) (P(VDF-TrFE-CFE)) terpolymer, exhibits high electromechanical response and dielectric response, suitable for a wide range of army applications such as micro-actuators, high efficiency pulse power capacitors, and solid state cooling devices. Recent experimental results show that with a simple blends approach, the terpolymer glass transition temperature can be raised quite markedly, resulting in a significant increase in the elastic modulus and consequently the elastic energy density, while the polarization response and electrostrictive strain remaining nearly the same. Utilizing the high electromechanical response, thin film microactuators and micropumps were fabricated, which showed very high microactuator displacement and force capability in comparison with the traditional piezoceramic based microdevices. Ink-jet microprinting technique was investigated for the fabrication of thin film devices an...

Relaxor Ferroelectric Polymers, Thin Film Devices, and Ink-Jet Microprinting for Thin Film Device Fabrication

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Relaxor Ferroelectric Polymers, Thin Film Devices, and Ink-Jet Microprinting for Thin Film Device Fabrication