Abstract Compact sensing methods are desirable for ionic polymer–metal composite (IPMC) actuators in microrobotic and biomedical applications. In this paper a novel sensing scheme for IPMC actuators is proposed by bonding an IPMC and a PVDF (polyvinylidene fluoride) thin film with an insulating layer in between. The insulating layer thickness is properly designed to minimize the stiffness of th...

This paper reports a systematic optimization of processing conditions of PVDF-TrFE piezoelectric thin films, used as integrated transducers in organic MEMS resonators. Indeed, despite data on electromechanical properties of PVDF found in the literature, optimized processing conditions that lead to these properties remain only partially described. In this work, a rigorous optimization of paramet...

• The air gap effect on PVDF hollow fiber membranes is much more evident for the dope solution with the high PVP concentration than low PVP concentration. • Large macro-voids/cavities in PVDF hollow fiber membranes are suppressed to the finger-like macro-voids and the separation layer is thickened when increasing PVP concentration in dope solution. • The hydrophilicity and viscosity of polymer ...

Thermally sensitive binder (TSB) is developed as an internal safety mechanism of lithium-ion battery (LIB). The TSB is a polymer blend of poly(vinylidene fluoride) (PVDF) and poly(vinylidene fluoride-co-hexafluoropropylene) (PVDF-HFP). Compared with regular PVDF binder, the softening and swelling of TSB are more pronounced when temperature is above 110 8C. With the TSB, the cycling performance ...

This work reports a facile novel approach to prepare asymmetric poly(vinylidene fluoride)/polystyrene (PVDF/PS) composite latex particles with controllable morphologies using one-step soap-free seeded emulsion polymerization, i.e., surface-initiated single electron transfer radical polymerization (SET-RP) of styrene (St) at the surface of PVDF seed particles. It was observed that the morphology...

Binary polyvinylidene fluoride/barium titanate(PVDF/BaTiO3) and its nanographite (GN) doped ternarynanocomposites were fabricated using a simple solution casting process followed by compression molding. The dielectricbehavior of such hybrids over a wide frequency range was studied. Additions of GN with contents close to the percolationthreshold were found to be very effective to...

Isothermal melt crystallization kinetics of PVDF was investigated by differential scanning calorimetry. Thin PVDF film has been fabricated by the solvent casting technique using dimethylformamide (DMF). Then, the samples were melted and subsequently crystallized in the range of the crystallization temperature (Tc) between 138 and 145 °C. The crystallization kinetics was derived from Avrami equa...

In this paper, we report a technique that uses piezoelectric polyvinylidene fluoride (PVDF) microbelts to convert the energy from low-speed air flow to electricity via their resonant oscillation. The micrometre thick PVDF thin films were fabricated by a top-down reactive ion etching process, where the thickness was controlled by etching time and the piezoelectric phase was well preserved. The t...

An attempt to reduce the number of steps and hence the overall costs involved in the preparation of hydrophilic flat sheet poly(vinylidene fluoride) (PVDF) membranes was made by adding PVDF polymer powders directly to an amphiphilic copolymer mixture containing PVDF grafted with poly(ethylene glycol) methyl ether methacrylate (PEGMA) (PVDF-g-PEGMA), solvent and unreacted PEGMA from the atom tra...

In this study, polyvinylidene fluoride (PVDF) flat membranes were treated with potassium hydroxide (KOH), sodium hydroxide (NaOH) and sodium hypochlorite (NaOCl). The effects of temperature, treatment duration and chemical concentration towards the properties of PVDF membrane were contrastively studied. Following treatment, membrane became much brittle with a reduced nominal elongation to as lo...