Molecular Vibrations of Three Crystal Forms of Poly(vinylidene fluoride)

Alkaline anion-exchange radiation-grafted membranes for possible electrochemical application in fuel cells

“…2). The Raman bands of PVDF have been previously assigned by Tadokoro et al 20 The Raman bands of styrene grafted PVDF membranes have also been reported extensively 21 and can be directly compared to those of the AEMs here. For PVDF, the strong CF 2 bend + CCC skeletal out-of-phase combination band at 612 cm -1 , the CF 2 bend at 537 cm -1 , and the CF 2 bend + CF 2 wag in-phase combination band at 486 cm -1 were indicative of the -phase of PVDF with a trans-gauchetrans-gauche chain conformation.…”

Effect of Solution Concentration on the Electrospray/Electrospinning Transition and on the Crystalline Phase of PVDF

“…All samples presented bands at 445, 510 and 840 cm -1 , characteristic of the  phase of PVDF [22,23]. Therefore, the β phase predominated both in the electrosprayed films and the electrospun meshes.…”

Quantum Chemical Investigations of Structural Parameters of PVDF-based Organic Ferroelectric Materials

“…Together with this strategy they also used the OPIUM code which led to a full reproduction of the structure and NMR and FTIR vibrational frequencies of the α-PVDF phase. With these results, they contributed to the understanding of those mode ambiguities founded experimentally (Makarevich & Nikitin, 1965;Wentink et al, 1961;Cortili & Zerbi, 1967;Kobayashi et al, 1975). In the case of finite models that are treated as molecules (Das et al, 1999), the DFT methodology with ab-initio methods implemented in the Gaussian 94 software package help in geometric structure, vibrational frequency, dipole moment and singlet-triplet energy separation of CH 2 , CHF, CF 2 , CCl 2 and CBr 2 studies, using B3LYP, B3P86 and B3PW91 hybrid density functionals.…”