On blends of poly(vinylidene fluoride) and poly(vinyl fluoride)

Guerra, Gaetno; Karasz, Frank E.; MacKnight, William J.

doi:10.1021/ma00161a026

Cited by 76 publications

(42 citation statements)

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“…Most studies concern the miscibility and phase behavior of amorphous-amorphous blends 1,2 or amorphous-semicrystalline ones. [3][4][5] Less studies, most of which are very recent, have focused on semicrystalline-semicrystalline blends; among the very important ones are those of different grades of polyethylene, 6 -10 poly(vinylfluoride), and poly(vinylidenfluoride), [11][12] as well as vinylidenfluoride-trifluoroethylene copolymers, 13 poly-(tetrafluoroethylene), and poly(tetrafluoroethyleneco-perfluoro-n-propylvi-nylether). 14 In the present article, we are interested in polymer blends obtained by melt mixing of poly-(tetrafluoroethylene) (PTFE) with random fluorinated copolymers of tetrafluoroethylene and perfluoromethylvinylether (PFMVE) or hexafluoropropylene (FEP) and between FEP and PFMVE.…”

Section: Introductionmentioning

confidence: 99%

Phase behavior of crystalline blends of poly(tetrafluoroethylene) and of random fluorinated copolymers of tetrafluoroethylene

Pucciariello

Angioletti

1999

J. Polym. Sci. B Polym. Phys.

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In the present article, we investigate by differential scanning calorimetry (DSC) the thermal behavior (melting, crystallization, and crystal–crystal transitions) far from equilibrium of blends constituted of two crystalline polymers. In particular, the following blends are examined: PTFE–PFMVE, PTFE–FEP, and FEP–PFMVE where PTFE is poly(tetrafluoroethylene), PFMVE is poly(tetrafluoroethylene‐co‐perfluoromethylvinylether), and FEP is poly(tetrafluoroethylene‐co‐hexafluoropropylene). The two last ones are random tetrafluoroethylene copolymers with small amounts of comonomer. Our results indicate that, under the experimental investigated conditions, the blends containing PTFE do not give cocrystallization on cooling from the melt, although under very rapid crystallization conditions, quenching, the presence of the copolymer would seem to slightly influence PTFE crystallization (lower peak temperatures are observed for the crystalline transitions and the melting with respect to those of the neat homopolymer). The behavior of the FEP–PFMVE blend is completely different; in fact, our results indicate the occurrence of cocrystallization, then miscibility in the crystalline phase, for almost all compositions and all investigated experimental conditions. © 1999 John Wiley & Sons, Inc. J Polym Sci B: Polym Phys 37: 679–689, 1999

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Section: Introductionmentioning

confidence: 99%

Phase behavior of crystalline blends of poly(tetrafluoroethylene) and of random fluorinated copolymers of tetrafluoroethylene

Pucciariello

Angioletti

1999

J. Polym. Sci. B Polym. Phys.

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“…It is also used in various device applications, due to its unique piezoelectric [8±10] and pyroelectric [11] properties. There are five known crystalline forms or polymorphs of PVDF: a, b, c, d, and e. [12] The a phase is the most common in melt crystallization, and remains the dominant crystalline form versus the b, and c phases. The c phase does not form except at high temperatures and pressures.…”

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confidence: 99%

Dramatic Enhancements in Toughness of Polyvinylidene Fluoride Nanocomposites via Nanoclay‐Directed Crystal Structure and Morphology

et al. 2004

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Addition of nanoclays or other nanoparticles into various polymers to produce nanocomposites has been extensively utilized in an attempt to enhance the mechanical, physical, and thermal properties of polymers. While some interesting properties have been demonstrated, the resulting nanocomposites have yet to realize their full potential. Nanoparticles in general, and nanoclays in particular, with their nanometer size, high surface area, and the associated predominance of interfaces in the nanocomposites, can function as structure and morphology directors, for example stabilizing a metastable or conventionally inaccessible polymer phase, or introduce new energy dissipation mechanisms. Thus, what distinguishes nanoparticles from conventional micrometer-size rigid reinforcements is that their role might not be limited to only adding stiffness to the polymer, but also to directing morphology, as well as introducing new energy-dissipation mechanisms leading to enhanced toughness in the nanocomposites. Herein we demonstrate this potential by reporting a remarkable (order of magnitude) increase in toughness with a concurrent increase in stiffness in a poly(vinylidene fluoride) (PVDF) nanocomposite.The kinetics of crystallite growth and the details of crystallite morphology of semicrystalline polymers can be affected by the presence of layered silicates. [1,2] Although some changes in morphology have been described in polymer/nanoparticle hybrids, [3±7] near-total stabilization and control of a crystalline phase, coupled with dramatic enhancements in materials properties, has not yet been reported. PVDF is an important engineering plastic. It is used extensively in the pulp and paper industry due to its resistance to halogens and acids, in nuclear-waste processing for radiation-, and hot-acid applications, and in the chemical processing industry for chemical and high-temperature applications. It is also used in various device applications, due to its unique piezoelectric [8±10] and pyroelectric [11] properties. There are five known crystalline forms or polymorphs of PVDF: a, b, c, d, and e.[12] The a phase is the most common in melt crystallization, and remains the dominant crystalline form versus the b, and c phases. The c phase does not form except at high temperatures and pressures. Earlier reports have shown that the a phase (chain conformationÐtrans-gauche trans-gauche, tgis inactive with respect to piezo-and pyroelectric properties, while the b form (all trans) exhibits the most activity, and is thus the focus for electromechanical and electroacoustic transducer applications. Thus, the b form has great technological utility and there have been numerous attempts to stabilize this phase. For example, the b form of the PVDF has been obtained by careful crystallization from solution, [13] by melt crystallization at high pressure, by application of a strong electric field, [14] by molecular epitaxy, [15] and by preparing a carbon-coated, highly oriented ultrathin film.[16] Earlier reports have indicated the possibility...

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“…X-ray diffraction pattern (A) and DSC thermograms of first and second heating (B) of 70:30 films annealed at 50, 90 and 120°C for 24h (S. On the basis of the reported data in literatures, WAXD data of neat PVDF contain 100, 020, 110, 021 reflections at 2θ= 17.9°, 18.4°, 20.1°, and 26.7° for -and only 200/110 reflection at 2θ= 20.8° for -crystalline form (A. Kaito, 2007, L.Yu, 2009& G. Guerra, 1986). -crystal planes are known to have overlapping reflections with (020), (110) and (021) -crystal planes and also 200/110 reflection of -phase.…”

Section: Resultsmentioning

confidence: 92%

Preparation and Characterization of PVDF/PMMA/Graphene Polymer Blend Nanocomposites by Using ATR-FTIR Technique

Mohamadi¹

2012

Infrared Spectroscopy - Materials Science, Engineering and Technology

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On blends of poly(vinylidene fluoride) and poly(vinyl fluoride)

Cited by 76 publications

References 7 publications

Phase behavior of crystalline blends of poly(tetrafluoroethylene) and of random fluorinated copolymers of tetrafluoroethylene

Phase behavior of crystalline blends of poly(tetrafluoroethylene) and of random fluorinated copolymers of tetrafluoroethylene

Dramatic Enhancements in Toughness of Polyvinylidene Fluoride Nanocomposites via Nanoclay‐Directed Crystal Structure and Morphology

Preparation and Characterization of PVDF/PMMA/Graphene Polymer Blend Nanocomposites by Using ATR-FTIR Technique

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