Analysis of 19F NMR spectra of vinylidene fluoride-trifluorochloroethylene copolymers

Murasheva, Ye.M.; Шашков, А. С.; Galil-Ogly, F.A.

doi:10.1016/0032-3950(79)90201-6

Cited by 27 publications

(30 citation statements)

References 9 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Determination of the comonomer content in the CTFE copolymer was more complex due to overlapping peaks, and was calculated using an equation derived previously (Murasheva et al, 1979;Isbester et al, 1998):…”

Section: Compositionmentioning

confidence: 99%

Evaluation of vinylidene fluoride polymers for use in space environments: Comparison of radiation sensitivities

Dargaville

Celina

Clough

2006

Radiation Physics and Chemistry

View full text Add to dashboard Cite

Section: Compositionmentioning

confidence: 99%

Evaluation of vinylidene fluoride polymers for use in space environments: Comparison of radiation sensitivities

Dargaville

Celina

Clough

2006

Radiation Physics and Chemistry

View full text Add to dashboard Cite

“…As illustrated in Scheme 1 , P(VDF-TrFE-DB)s containing varied CH=CH double bonds were synthesized from P(VDF-TrFE). The chemical composition of the desired P(VDF-TrFE-DB)s was finely controlled and identified using 1 H NMR as shown in Figure 1 and 19 F NMR for comparison [ 26 , 27 , 28 ], which was previously well assigned. Comparing the 1 H NMR spectra of P(VDF-TrFE), the new multiple signals (4) at 6.5–7.0 ppm of P(VDF-TrFE-DB)s from Figure 1 are identified as the protons on the double bonds (–CF 2 –CH=CH–CF 2 –) after the elimination of HF from (–CF 2 CH 2 –CFHCF 2 –).…”

Section: Resultsmentioning

confidence: 99%

Regulating Dielectric and Ferroelectric Properties of Poly(vinylidene fluoride-trifluoroethylene) with Inner CH=CH Bonds

et al. 2018

View full text Add to dashboard Cite

Poly(vinylidene fluoride) (PVDF) based ferroelectric polymers have attracted considerable attention both academically and industrially due to their tunable ferroelectric properties. By pinning the conformation of the polymer chain and the ferroelectric phase physically or chemically, the ferroelectric behaviors of PVDF based polymers could be finely turned from normal ferroelectric into relaxor ferroelectric, anti-ferroelectric like, and even linear dielectric. Besides high energy electron irradiation and chemical copolymerization with the bulky monomers, in this work, an alternative strategy is presented to regulate the dielectric and ferroelectric performances of PVDF based ferroelectric polymer for the first time. CH=CH bonds with the desired content are inserted by a controlled dehydrofluorination reaction into a poly(vinylidene fluoride-trifluoroethylene) (P(VDF-TrFE)) copolymer (TrFE refers to trifluoroethylene) synthesized from the hydrogenation of P(VDF-CTFE) (CTFE refers to chlorothrifluoroethylene). The influence of the CH=CH bonds along with the fabrication conditions on the crystallization and ferroelectric relaxation of the resultant copolymers (referred to P(VDF-TrFE-DB)) was carefully characterized and discussed. The nonrotatable CH=CH bonds result in depressed dielectric and ferroelectric performances in the as-cast films by confining the orientation of ferroelectric grains in P(VDF-TrFE). The normal ferroelectric performance of P(VDF-TrFE) is turned into anti-ferroelectric like behavior in the resultant P(VDF-TrFE-DB). The cleavage of CH=CH bonds is responsible for the recovery of the ferroelectric behavior in the annealed samples. Uniaxial stretching favors the alignment of the polymer chain and ferroelectric domains, which may address the further regulated ferroelectric characters in the stretched samples.

show abstract

“…7,8 Muresheva developed the following equation for determining the monomer ratio for VF 2 and CTFE copolymers. 7 The following assumptions were used in the derivation Table 3. Note: Copolymer B has both additional curesite monomer and TFE impurity, as shown by peaks at -108.8, -109.8, and -119 to -125 ppm.…”

Section: Resultsmentioning

confidence: 99%

High-Resolution Variable-Temperature ¹⁹F MAS NMR Spectroscopy of Vinylidene Fluoride Based Fluoropolymers

et al. 1998

View full text Add to dashboard Cite

Variable-temperature (VT) solid-state 19 F NMR spectroscopy with high-speed magic-angle spinning (MAS) has been used to study copolymers of vinylidene fluoride and hexafluoropropylene and of vinylidene fluoride and chlorotrifluoroethylene, and terpolymers of vinylidene fluoride, tetrafluoroethylene, and hexafluoropropylene. High-resolution spectra were obtained by simultaneously using MAS speeds up to 25 kHz and heating to 250°C. Sufficient resolution was achieved to assign peaks by comparison to results obtained from solution-state NMR studies and to determine the monomer composition of the polymer.

show abstract

Analysis of 19F NMR spectra of vinylidene fluoride-trifluorochloroethylene copolymers

Cited by 27 publications

References 9 publications

Evaluation of vinylidene fluoride polymers for use in space environments: Comparison of radiation sensitivities

Evaluation of vinylidene fluoride polymers for use in space environments: Comparison of radiation sensitivities

Regulating Dielectric and Ferroelectric Properties of Poly(vinylidene fluoride-trifluoroethylene) with Inner CH=CH Bonds

High-Resolution Variable-Temperature ¹⁹F MAS NMR Spectroscopy of Vinylidene Fluoride Based Fluoropolymers

Contact Info

Product

Resources

About

Analysis of 19F NMR spectra of vinylidene fluoride-trifluorochloroethylene copolymers

Cited by 27 publications

References 9 publications

Evaluation of vinylidene fluoride polymers for use in space environments: Comparison of radiation sensitivities

Evaluation of vinylidene fluoride polymers for use in space environments: Comparison of radiation sensitivities

Regulating Dielectric and Ferroelectric Properties of Poly(vinylidene fluoride-trifluoroethylene) with Inner CH=CH Bonds

High-Resolution Variable-Temperature 19F MAS NMR Spectroscopy of Vinylidene Fluoride Based Fluoropolymers

Contact Info

Product

Resources

About

High-Resolution Variable-Temperature ¹⁹F MAS NMR Spectroscopy of Vinylidene Fluoride Based Fluoropolymers