Raman, morphology and electrical behavior of nanocomposites based on PEO/PVDF with multi-walled carbon nanotubes

Abstract

a b s t r a c tIn this work, FT-IR, Raman, TEM spectroscopy and AC conductivity were used to study and characterize of PEO/PVDF blend incorporated with low content of multi-walled carbon nanotubes (MWCNTs). Main characteristics of IR and Raman bands for the two polymers and MWCNTs were observed. The shift of G, D and G 00 bands of MWCNTs occurred. All results showed that MWNTs-COOH were covalently linked with the blend through OH and C-C bonds. TEM images illustrated that MWNTs were well dispersed into polymeric matrices and wrapped with PEO/PVDF chains. The temperature dependent conductivity measurements of nanocomposites were studied. The addition of MWCNTs increases and enhances the conductivity attributed to charge carrier build up and increases in segmental mobility of polymeric chains. Molecules in the loaded samples begin to bridge the gap which separates them by lowering potential barriers and the localized state between them. Values of both e 0 and e 00 are high at lower frequency and decrease with an increase of frequencies due to polarization effects.

Eudragit E100/poly(ethylene oxide) electrospun fibers for DNA removal from aqueous solution

“…Characteristics peaks of PEO were observed at 1475 cm −1 (in‐phase group vibration of CH 2 ), bands at 1226 and 1275 cm −1 are assigned to out‐of‐phase twisting of C‐H group, band at 1055 cm −1 is assigned to stretching mode of C‐O group while band at 836 cm −1 is identified as the response of hydroxyl end groups . The comparison of bands in pristine compounds (as powder) and the resulting Raman spectrum of fibers of Eudragit E100/PEO confirmed the presence of bands for both polymers and revealed the adequate incorporation of PEO in electrospun fibers.…”

A Highly Stable Separator from an Instantly Reformed Gel with Direct Post‐Solidation for Long‐Cycle High‐Rate Lithium‐Ion Batteries

“…The peaks at 839 and 878 cm À1 are associated with the amorphous phase of PVDF-HFP.T he increased intensity of the peak at 839 cm À1 indicates that the separators become more amorphous as the amount of NMP solvent increases because NMP serves as an internal coagulant and makest he separator structure more flexible. [24][25][26][27] .T he XRD patterns of M-0, M-0.5,M -1, and M-1.5 presentedi nF igure2bs how four distinct characteristicp eaks at 18.3, 20.1, 27, and3 9.58,w hich correspondt ot he (0 20), (110), (0 21), and( 200) planes of the a-phaseP VDF-HFPc rystal. [25,27] In addition, with increasing NMP solvent, the peaks at 18.3, 27, and 39.58 disappear gradually as ar esult of the increasingly amorphous structure.…”

Free-Standing PVDF/Reduced Graphene Oxide Film for All-Solid-State Flexible Supercapacitors towards Self-Powered Systems

“…Figure 3B shows the Raman bands of the PVDF/reduced graphene oxide composite film exhibits the characteristic Raman vibrational bands of graphene. The band at 1357 and 1599 cm −1 corresponds to the D and G band of the graphene in the PVDF matrix [41], and the other bands in the region of 700 to 1000 cm −1 corresponds to the characteristic band of PVDF [42]. The surface morphology and the elemental mapping analysis of PVDF/reduced graphene oxide composite film are shown in Figure 3C-G. Figure S4A,B show the FE-SEM micrograph of reduced graphene oxide resembling the sheet like morphology.…”