Spectroscopic and thermal investigations of poly(vinylidene fluoride) films composites with LaNi₃Co₂

Abstract

Poly(vinylidene fluoride) (PVDF) and LaNi 3 Co 2 were composites in various combinations by using melting technique. Morphological and physical properties of both the surface and interface of poly(vinylidene fluoride)/ LaNi 3 Co 2 composite films have been investigated. FTIR and XRD diffraction analysis evidenced the increase of α, β and γ-PVDF crystalline phases. The bands at 888 and 1414 cm -1 were assigned to γ-phase of PVDF. Maximum value of the relative amount of β-phase was observed at 35 and 60 % FL. This result was confirmed by X-ray diffraction (XRD) and differential scanning calorimetry (DSC) analysis. Maximum value of degree of crystallinity was observed at 15% Filling level (FL). Morphology of SEM consists of two different size rings and spherulites. DSC was used to identify the melting temperature, the order of reaction and the activation energy of melting. A sharp endothermic peak at T m ≈ 444 K due to melting and T 2 ≈ 360 K due to α-relaxation/transition. Maximum values of magnetoresistance (MR) observed from range (243 to 238K) are due to reorientation of dipoles in a process associated with the glass transition temperature of PVDF.

Fourier transform infrared and ultraviolet-visible investigation of swift heavy 100 MeV Ag-ion- and 75 MeV oxygen-ion-irradiated polyvinylidene fluoride thin films

“…The infrared characteristic band frequencies are given in Table 1 along with their sources of origin. It was observed that the characteristic bands are almost independent of the film thickness and are in conformity with the results obtained by other groups [5,[18][19][20][21][22][23][24][25]. The authors have assigned frequencies 1174, 1167, and 1181 cm −1 corresponding to 9, 12, and 20 μm pristine films, respectively, as CF 2 asymmetric stretching mode, as the CF 2 group absorbs strongly in the region 1120-1350 cm −1 .…”

Influence of the processing method on the properties of a PVDF film

“…Several peaks with different intensities are observed in the diffractogram: a weak peak at 18.3°, a sharp peak at 20.2°, and two smeared peaks near 36 and 40° characteristic for the (100), (020), (110) and (200) PVDF crystal planes [18]. These peaks are typically associated with α-, β-, and γ-phases of PVDF [9,14,[18][19][20].…”

Correlation between Crystallization Kinetics and Electroactive Polymer Phase Nucleation in Ferrite/Poly(vinylidene fluoride) Magnetoelectric Nanocomposites

“…46 The obtained value for the α-PVDF activation energy is in the same order of previous investigations. 47,48 Fine dispersion in the nanocomposite with 0.01 wt % of CoFe 2 O 4 was achieved, and the nucleating effect of nanoparticles was most significant; thus, its crystallization activation energy was the lowest. The increasing crystallization activation energy with increasing ferrite content results from the restriction of polymer chain movements caused by high ferrite loading.…”