Structure

Poly(vinylidene fluoride)

CAS
24937-79-9
Catalog Number
ACM24937799-2
Category
Polymer/Macromolecule
Molecular Formula
(-CH2CF2-)n

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Specification

Description
Inert coating resin.
Polydispersity 2.5-3.0
SOLUBILITY: DMF, DMAc, DMSO, ethylene carbonate
Melting Point
155-160 °C
Density
1.76 g/cm3
Storage
Store at room temperature
Alpha Sort
Poly(vinylidene fluoride)
Color/Form
Colorless gas;Colorless gas [Note: Shipped as a liquefied compressed gas].;Crystals ... Available forms: powder, pellets, solution, and dispersion
Complexity
27
Covalently-Bonded Unit Count
1
Decomposition
The substance decomposes on heating or on burning producing toxic and corrosive fumes including hydrogen fluoride, fluorine and fluorides.
EC Number
200-867-7;607-458-6
Exact Mass
64.012456g/mol
Formal Charge
0
H-Bond Acceptor
2
H-Bond Donor
0
Heat of Vaporization
1.7712X10+07 J/kmol at melting point
Heavy Atom Count
4
ICSC Number
0687
LogP
1.24 (LogP);log Kow = 1.24;1.24
Monoisotopic Mass
64.012456g/mol
NSC Number
267683
Odor
Nearly odorless;Faint, ethereal
Other Experimental
Conversion factors: 1 mg/L is equivalent to 382 ppm and 1 ppm is equivalent to 2.62 mg/cu m at 25 °C, 760 mm Hg;Critical density = 417 kg/cu m; Heat of formation = -345.2 kJ/mol at 25 °C; Heat of polymerization = -474.21 kJ/mol at 25 °C; explosive limits = 5.8-20.3 vol % in air;Critical molar volume: 154 cu cm/mol;Dipole moment = 1.3893;Explosive limits in air 5.5-21%;Heat of evaporation = 13189 J/mol at -40 °C;Liquid molar volume = 0.055194 cu m/kmol; Vapor pressure = 3X10+4 mm Hg at 25 C (calculated from experimentally derived coefficients);Sensitive to heat or stabilizers; alkyl boron and alkyl hyponitrite compounds, among others, initiate polymerization;Henry's Law constant = 3.79X10-1 atm-cu m/mol at 25 °C (est);Hydroxy radical reaction rate constant = 2.10X10-12 cu cm/molec-sec at 23 °C;Thermally stable from -62 to 148 °C; combustible, self-extinguishing and non-dripping; Tensile strength 7000 psi at 25 °C, yield strength 5,500 psi, elongation 300%, compression strength 10,000 psi, thermal conductivity 1.05 Btu/hr/sq ft/F/in; water absorption 0.04% in 24 hr; resistant to oxidative degradation, electricity, acods, alkalies, oxidizers, halogens;Specific gravity: 1.75-1.80; glass transition: -40 °C;Specific heat: 1255-1525 J/(kg K)
Refractive Index
n25/D 1.420
Rotatable Bond Count
0
RTECS Number
KW0560000
Stability
Chemical stability: Stable under recommended storage conditions.
UNII
3C1IX2905B
UN Number
1959;1959;1959;1959;1959
Vapor Density
2.2 (NTP, 1992) (Relative to Air);2.2 (AIR= 1);Relative vapor density (air = 1): 2.2;2.21
Viscosity
28-34 K poise
XLogP3
1.3

Effect of Polyvinylidene Fluoride (PVDF) as a Binder on Electrode Performance

Wang M, et al. Journal of The Electrochemical Society, 2019, 166(10): A2151.

Many commercial lithium-ion batteries employ polyvinylidene fluoride (PVDF) as a binder due to its excellent electrochemical stability, wettability with the electrolyte, and acceptable bond strength between the electrode laminate and current collector.
· Preparation of electrode powders: The powder mixtures, composed of 90 wt% LiNi0.33 Co33Mn0.33O2(NMC), 5 wt% conductive carbon black, and 5 wt% PVDF were prepared in a planetary mixer for 4 cycles.
· Effect of PVDF binder: The microstructure and porosity of the PVDF layer depend strongly on the molecular weight of the PVDFs. With increasing molecular weight, the PVDF layer becomes more porous, improving the high-rate capacity without decreasing binding strength and long-term cycling performance of the electrodes.

Plasma Treatment of PVDF Powder for Preparation of Antifouling Ultrafiltration Membrane

Zhao, Xinzhen, et al. RSC advances, 2015, 5(79), 64526-64533.

In order to improve antifouling properties, plasma treatment was used to modify PVDF powder, followed by polymerization to prepare PVDF-g-PAA amphiphilic copolymer, and non-solvent induced phase separation (NIPS) method to prepare modified PVDF membrane.
Preparation of antifouling PVDF membrane
· Evenly distribute the PVDF powder on the cardboard, put it into a plasma chamber, use helium (He, 50 Pa) as the discharge gas, process it at 100 W for 100 s, and then place the treated PVDF powder in the atmosphere for 1 h Fully oxidized.
· Dissolve the treated PVDF powder and dimethylacetamide (DMAC) in a three-flask at room temperature, then add acrylic acid (AA) monomer for subsequent polymerization, and steadily pass nitrogen flow into the mixture for 30 minutes, and then add the three-flask The flask was transferred to an 80°C oil bath and the reaction continued for 1 hour.
· Add PVDF powder to the above mixed solution to obtain a uniform casting liquid. Use a 200 μm pouring knife to pour the pouring solution onto the glass plate and immediately immerse it in the water coagulation bath. All prepared membranes were stored in pure water for 24 h to remove monomers and homopolymers of AA.

Improvement of Dielectric Properties of BaTiO3/Polyvinylidene Fluoride Composites

Fu, Jing, et al. ACS applied materials & interfaces, 2015, 7(44), 24480-24491.

In order to improve the dielectric properties of BaTiO3/polyvinylidene fluoride (BT/PVDF) composites such as poor interfacial compatibility and low dielectric constant, a simple modification strategy was adopted to introduce high spontaneous polarization coarse BT particles. In this strategy, the maximum energy density of the obtained BT/PVDF composite is 30×10-3 J/cm3 at 10 kV/mm, which is approximately 4.5 times that of the pure PVDF matrix.
Preparation steps of BT/PVDF composite materials
· First, BT particles of different particle sizes with good dispersion were synthesized through a simple molten salt method by adjusting the calcination temperature.
· PVP-coated BT composites were prepared by modification treatment with water-soluble polyvinylpyrrolidone (PVP) reagent, which exhibited a fine core-shell structure.
· Finally, the powdered PVDF polymer was dissolved in N,N-dimethylformamide (DMF) solvent, and functional PVP/BT nanoparticles were added to the solution with dissolved PVDF. The composite material was obtained after solution sonication, solvent evaporation and hot-pressing processes.

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