Results 211 to 220 of about 805,268 (254)
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Structure and Morphology of Poly(vinylidene fluoride) Nanoscrolls
ACS Macro Letters, 2017To date the scrolled morphology of γ-phase poly(vinylidene fluoride) (PVDF) has been witnessed via high temperature melt crystallization of crystalline thin films and through imaging of chemical etched PVDF bulk films. Here we show the first growth and characterization of free-standing γ-phase PVDF scrolls via solution crystallization.
Gabriel R. Burks +4 more
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Journal of The Electrochemical Society, 2006
The compatibility of a poly(vinylidene fluoride)/poly(methyl methacrylate) (PVDF/PMMA) blend and the crystal structure of PVDF were examined according to the blend ratio, the cooling speed from the melt state, and the annealing condition. Different crystal structures, PVDF (form I) and PVDF (form II), could be produced from the PVDF/PMMA blend ...
Hideo Horibe, Mitsuru Taniyama
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The compatibility of a poly(vinylidene fluoride)/poly(methyl methacrylate) (PVDF/PMMA) blend and the crystal structure of PVDF were examined according to the blend ratio, the cooling speed from the melt state, and the annealing condition. Different crystal structures, PVDF (form I) and PVDF (form II), could be produced from the PVDF/PMMA blend ...
Hideo Horibe, Mitsuru Taniyama
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Journal of Polymer Science Part B: Polymer Physics, 1987
AbstractTemperature dependent Brillouin scattering studies of PVF2 films stretched to various stretch ratios have been carried out. Elastic constants for unstretched and stretched films have been obtained as functions of temperature. The elastic constant C33 of the stretched films has a greater temperature dependence than that of unstretched films.
C. H. Wang, Q.‐L. Liu, B. Y. Li
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AbstractTemperature dependent Brillouin scattering studies of PVF2 films stretched to various stretch ratios have been carried out. Elastic constants for unstretched and stretched films have been obtained as functions of temperature. The elastic constant C33 of the stretched films has a greater temperature dependence than that of unstretched films.
C. H. Wang, Q.‐L. Liu, B. Y. Li
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Chlorinated poly(vinylidene fluoride)
Journal of Applied Polymer Science, 1980AbstractChlorinated poly(vinylidene fluoride) (PVF2) was prepared by introducing chlorine gas into a CCI4 suspension of PVF2 at reflux temperature. Polymer crystallinity and softening point decrease, while solubility and adhesion increase with the degree of chlorination.
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New vinylidene fluoride copolymers: Poly(vinyl acetate-co-vinylidene fluoride)
Journal of Polymer Science Part C: Polymer Letters, 1989Abstract : Copolymers of vinylidene fluoride and vinyl acetate have been prepared at varied compositions and characterized by 1H-NMR, 13C-NMR, FTIR, DSC and TGA. Copolymers were obtained as both THF soluble and insoluble fractions with the former having a relatively random distribution of monomers along the chain and the latter being somewhat blocky in
V. Panchalingam, John R. Reynolds
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Journal of Applied Polymer Science, 2017
ABSTRACTConsidering the complementary properties of poly(vinylidene fluoride) (PVDF) and poly(vinylidene fluoride‐trifluoroethylene) [P(VDF‐TrFE)], it appears that their blends have the potential to be promising candidates for device applications. We report the evolution of morphology, ferroelectric, and mechanical properties (modulus and hardness) and
G. Suresh +5 more
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ABSTRACTConsidering the complementary properties of poly(vinylidene fluoride) (PVDF) and poly(vinylidene fluoride‐trifluoroethylene) [P(VDF‐TrFE)], it appears that their blends have the potential to be promising candidates for device applications. We report the evolution of morphology, ferroelectric, and mechanical properties (modulus and hardness) and
G. Suresh +5 more
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Journal of Polymer Science Part B: Polymer Physics, 1996
Thermoreversible gelation behavior of blend of poly(vinylidene fluoride) and poly(vinylidene fluoride-trifluoroethylene) in γ-butyrolactone solution was studied. Sol-gel transition temperature increased with the increase of polymer concentration, but was independent of the blend ratio of two polymers. An equation for gelation rate was derived, assuming
Jae Whan Cho, Gyu Won Lee
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Thermoreversible gelation behavior of blend of poly(vinylidene fluoride) and poly(vinylidene fluoride-trifluoroethylene) in γ-butyrolactone solution was studied. Sol-gel transition temperature increased with the increase of polymer concentration, but was independent of the blend ratio of two polymers. An equation for gelation rate was derived, assuming
Jae Whan Cho, Gyu Won Lee
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Journal of Applied Polymer Science, 2002
AbstractThis study presents an investigation of the effect of the different crystalline phases of each blend component on miscibility when blending poly(vinylidene fluoride) (PVDF) and its copolymer poly[(vinylidene fluoride)‐ran‐trifluorethylene] [P(VDF–TrFE)] containing 72 mol % of VDF.
Rinaldo Gregorio +3 more
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AbstractThis study presents an investigation of the effect of the different crystalline phases of each blend component on miscibility when blending poly(vinylidene fluoride) (PVDF) and its copolymer poly[(vinylidene fluoride)‐ran‐trifluorethylene] [P(VDF–TrFE)] containing 72 mol % of VDF.
Rinaldo Gregorio +3 more
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Ferroelectrics, 1998
Abstract We present calculated compliance and piezoelectric constants for polyvinylidene fluoride (PVDF) and its copolymer with trifluoroethylene P(VDF/TrFE). The constants were derived by minimizing the energy of the unit cell under various states of stress, using a modified molecular mechanics force field.
G. J. Kavarnos +2 more
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Abstract We present calculated compliance and piezoelectric constants for polyvinylidene fluoride (PVDF) and its copolymer with trifluoroethylene P(VDF/TrFE). The constants were derived by minimizing the energy of the unit cell under various states of stress, using a modified molecular mechanics force field.
G. J. Kavarnos +2 more
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Poly(vinylidene fluoride) membranes
2016Poly(vinylidene fluoride) (PVDF) membranes have been intensively investigated and commercialised with broad applications in water purification and wastewater treatment for decades due to its outstanding properties. Currently, PVDF membranes are mainly produced by the phase inversion technique, which is predominant in both laboratory research and ...
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