Nanoscale interfacial electroactivity in PVDF/PVDF-TrFE blended films with enhanced dielectric and ferroelectric properties

Abstract

The existing interactions substantially affect the structure of PVDF/PVDF-TrFE blends as well as their electric properties.

Carbon Nanolights in Piezopolymers are Self‐Organizing Toward Color Tunable Luminous Hybrids for Kinetic Energy Harvesting

“…The crystal forms of the polymer in the hybrids were subsequently determined by WAXD and ATR‐FTIR. With reference to X‐ray diffraction data (Figure 3b), the distinct Bragg reflection peak at the 2θ angle of 19°–20°, corresponding to the (110)/(200) lattice planes, indicated the presence of crystalline β phase PVDF‐TrFE for all the hybrid samples . As for IR spectra (Figure 3c), the prominent characteristic bands associated with polar β‐phase, at the wavelengths of 840, 1286, and 1430 cm −1 , respectively, further confirmed the β phase of the polymer in the pressure crystallized hybrids …”

“…Similar to PVDF, PVDF‐TrFE is a semicrystalline polymer with at least four polymorphs (α, β, γ, and δ) . The content and structure of crystalline β phase is responsible for its piezoresponse magnitude . However, homopolymer PVDF generally crystallizes in nonpolar α phase, whereas copolymer PVDF‐TrFE readily crystallizes into polar β phase regardless of processing method .…”

“…The content and structure of crystalline β phase is responsible for its piezoresponse magnitude . However, homopolymer PVDF generally crystallizes in nonpolar α phase, whereas copolymer PVDF‐TrFE readily crystallizes into polar β phase regardless of processing method . The introduction of TrFE co‐monomer into VDF sterically hinders the formation of a trans‐gauche‐trans‐gauche ( tg + tg − ) configuration .…”

“…However, homopolymer PVDF generally crystallizes in nonpolar α phase, whereas copolymer PVDF‐TrFE readily crystallizes into polar β phase regardless of processing method . The introduction of TrFE co‐monomer into VDF sterically hinders the formation of a trans‐gauche‐trans‐gauche ( tg + tg − ) configuration . It forces the molecular chains into an all‐trans ( tttt ) conformation (β phase) .…”

Perovskite Srx(Bi1−xNa0.97−xLi0.03)0.5TiO3 ceramics with polar nano regions for high power energy storage

“…However, the low energy density of dielectric capacitors is the barrier for applications. At present, the typical value of energy density for commercial polymer based capacitors is around 1 J/cm 3 (Biaxially Oriented Polypropylene, BOPP) and even lower for ceramic capacitors (0.1-0.5 J/cm 3 ) [11].…”