Improving dielectric properties, electrical conductivity, and thermal properties of biodegradable polymer composites prepared with lanthanum

Abstract

The precipitation method was adapted to synthesize the poly(ε-caprolactonecopolymer-ethylene oxide) (ε-CL-co-EO) composite with the salt of lanthanum (La), a rare earth element. This salt was incorporated into the polymer of different weight percentages to study how it affects the thermal and dielectric properties of the polymer. The resulting products were characterized by Fourier Transform Infrared Spectroscopy, X-ray diffractometry (XRD), Scanning electron microscopy (SEM) and thermogravimetric analysis. XRD and SEM data show that the polymer mixes homogeneously with the metal salt. Thermal degradation data show that the thermal stability of composites synthesized with La is lower than that of pure polymer. The dielectric properties and A.C conductivity measurements of the composites were investigated by using impedance analyzer in the frequency range (100 Hz to 20 kHz) at room temperature. The electrical property results of (ε-CL-co-EO)/La composites displayed that dielectric constant (έ), dielectric loss (ε"), tan delta (tan δ) and A.C electrical conductivity (σ ac ) increase with increasing La content. The largest conductivity of (ε-CL-co-EO)/La composite filled with 20 wt% La was 8.80 Â 10 À8 S/cm, which was 162% times pure (ε-CL-co-EO). In addition, impedance (IZI) of composites was evaluated from the dielectric data. This procedure is eco-friendly and easy to handle, which provides a promising route to polymer composites in the application of the conductivity field.

In situ emulsion polymerization of poly (vinyl acetate) and asparagus racemosus biopolymer composites for flexible energy storage applications

“…This is due to the aggregation of AR in the polymer, which reduces the contact between the filler and the polymer, resulting in a reduced dielectric value. [ 40 ] The findings of this research indicate that PVAc/AR composites have excellent mechanical, thermal, and electrical properties, and thus biopolymer composite films could be a candidate for charge storage, flexible electronic, and other electrochemical devices.…”

Improved dielectric properties of poly(arylene ether nitrile) with sulfonated poly(arylene ether nitrile) modified CaCu3Ti4O12

“…The electrical industry's shift toward miniaturization and portability, as well as the growing demand for energy, has resulted in a surge of interest in polymer-based composite dielectric nanomaterials with excellent dielectric properties. [1][2][3][4] These composites hold promise in high-charge storage devices, including film capacitors, 5,6 embedded capacitors, [7][8][9] artificial muscles, smart skins, 10 and high-speed integrated circuit devices. [11][12][13][14][15] However, despite their excellent processability and mechanical properties, the practical applications of polymeric dielectric materials are limited due to their low dielectric constant.…”

“…The electrical industry's shift toward miniaturization and portability, as well as the growing demand for energy, has resulted in a surge of interest in polymer‐based composite dielectric nanomaterials with excellent dielectric properties 1–4 . These composites hold promise in high‐charge storage devices, including film capacitors, 5,6 embedded capacitors, 7–9 artificial muscles, smart skins, 10 and high‐speed integrated circuit devices 11–15 .…”

Water absorption of biomass fillers to impact the degradation of poly(butyleneadipate‐co‐terephthalate) composites

“…Accordingly, some necessary theoretical guidance concerning the adjustment and control of degradation behavior of PBAT composites can be expected to provide. [32][33][34][35] As we know, the degradation of PBAT is actually the hydrolysis of ester bonds in molecular chain. The water absorption of PBAT/biomass filler composites should undoubtedly produce a significant impact on the degradation of PBAT.…”

“…Therefore, it is necessary to found out the key impact factor of biomass fillers on the degradation of PBAT composites. Accordingly, some necessary theoretical guidance concerning the adjustment and control of degradation behavior of PBAT composites can be expected to provide 32–35 …”