Infrared spectroscopic investigation of chain conformations and interactions in P(VDF-TrFE)/PMMA blends

Deciphering TrFE Fingerprints in P(VDF-TrFE) by Raman Spectroscopy: Defect Quantification and Morphotropic Phase Boundary

“…Immediately after, zone 4 (1320–1380 cm –1 ) contains modes associated with the TrFE units (around 1347 and 1366 cm –1 ). This assignment has not always been reported in the literature, with works disregarding these bands, performing wrong mode attribution, or acknowledging its relationship with TrFE without further exploration. ,− The neglect is in part due to the low intensity of these bands for low TrFE contents. So far, there has not been an exploration of the type of vibration, the associate chain segments, or their relationship with the material behavior or crystallinity, despite reports during the 1980s and 1990s on the synthesis of P­(VDF-TrFE) and polytrifluoroethylene (PTrFE) and their IR and Raman spectra. ,− An increase in mode intensity is clearly observed with the TrFE molar content.…”

“…This analysis intends primarily to extract valuable information from the Raman spectra, by providing detailed vibration band labeling and relating the changes observed to the structure with respect to the TrFE content. In the literature, the chain conformation analysis has been predominantly made with FT-IR spectroscopy, with only a handful of works providing in-depth discussions of Raman spectra. ,− ,− Several of these works have performed crystalline band labeling based on theoretical spectral simulations. Simulations of Raman and FT-IR spectra identify the lattice modes of an ideal crystal, which calculates the contribution of an infinite crystal lattice.…”

Designing Micro Bulge Structure with Uniform PS Microspheres for Boosted Dielectric Hydrophobic Blend Films

“…With the addition of different particle size and different mass fraction of PS, the melting temperatures are basically the same, indicating that the addition of PS has no obvious effect on the melting temperature of the composite films. According to the literature [9,22,24,25], the glass transition temperature (T g ) was about −20 • C, but because the temperature signal of the transition point was weak, we used the same differential scanning calorimeter to analyze the modulation melting curve and get the curve of temperature derivative of the modulation melting curve in Figure 7c. The glass transition temperature (T g ) was about −20 • C. The T g values of the blend films with different mass fractions are shown in Table 1.…”

Magnetic ionic liquid/polymer composites: Tailoring physico-chemical properties by ionic liquid content and solvent evaporation temperature

“…(Figure 3a) and with different MIL contents (Figure 3b). The bands at 1432 and 1398 cm -1 are assigned to the bending and wagging vibrational modes of CH2, and to the symmetric stretching vibration of C-C group, respectively 22 . The bands at approximately 1171, 882, 842, 502, 465 and 411 cm -1 can be assigned to the stretching vibration of the group CF2.…”

“…The feature at 842 cm -1 is the band assigned to the β-phase of the polymer 22 . No other polymer characteristic phases were observed since, it is known that for solvent evaporation temperatures up to 80 °C, the chain entanglements of the polymer chain lead to an oriented packing of CH2-CF2 dipoles promoting the nucleation of the β-phase 23 .…”