Fluorinated Elastomers

Améduri, Bruno

doi:10.1002/0471440264.pst137.pub2

Cited by 4 publications

(2 citation statements)

References 38 publications

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“…Currently, these specialty polymers are also involved in specific UV and aging resistant coatings and have been involved in many other applications: (i) Wires and cables in wide domains such as aerospace (because of their high limiting oxygen index value, PTFE coatings ensure fire retardancy in several-hundred-kilometer cables and connections in planes), insulation (insulation resistance ≥ 1500 MΩ.km), electrical applications, and high-frequency (5000 V) performance in coaxial cables for avionics and high-temperatureresistant cables for aeroengine services [71]. The resilience and inertness of crosslinked elastomers provide exceptional performance to gaskets in shuttles [72]. (ii) Materials for energy storage and conversion (as key candidates for the energetic transition: cathode binders in lithium ion batteries, proton exchange fuel cell membranes, backsheets of photovoltaic panels, electroactive (piezoelectric and electrothermal) devices [73], haptics, printed electronics, dielectrics, for virtual reality, and actuators for artificial muscles, and are indispensable drivers of the European Green Deal).…”

Section: Fluoropolymers (Ie Backbone Containing C-f Bonds) Valuable F...mentioning

confidence: 99%

“…The most prevalent materials are PTFE [61], PVDF [73,85], poly(chlorotrifluoroethylene), PCTFE [86], and the copolymers based on tetrafluoroethylene, TFE [87], and vinylidene fluoride, VDF [88], which can be either thermoplastics or elastomers [72]. Usually, in their conditions of uses, FPs are safe, stable (thermally, chemically against UV and aging, and biologically), durable, non-toxic, non-bioaccumulative, insoluble in water and thus nonmobile, hydrolytically stable, and are not subject to hydrolysis-catalyzed or -metabolized degradation.…”

Section: Fluoropolymers (Ie Backbone Containing C-f Bonds) Valuable F...mentioning

confidence: 99%

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Fluoropolymers as Unique and Irreplaceable Materials: Challenges and Future Trends in These Specific Per or Poly-Fluoroalkyl Substances

Améduri

2023

Molecules

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In contrast to some low-molar-mass per- and polyfluoroalkyl substances (PFASs), which are well established to be toxic, persistent, bioaccumulative, and mobile, fluoropolymers (FPs) are water-insoluble, safe, bioinert, and durable. These niche high-performance polymers fulfil the 13 polymer-of-low-concern (PLC) criteria in their recommended conditions of use. In addition, more recent innovations (e.g., the use of non-fluorinated surfactants in aqueous radical (co)polymerization of fluoroalkenes) from industrial manufacturers of FPs are highlighted. This review also aims to show how these specialty polymers endowed with outstanding properties are essential (even irreplaceable, since hydrocarbon polymer alternatives used in similar conditions fail) for our daily life (electronics, energy, optics, internet of things, transportation, etc.) and constitute a special family separate from other “conventional” C1–C10 PFASs found everywhere on Earth and its oceans. Furthermore, some information reports on their recycling (e.g., the unzipping depolymerization of polytetrafluoroethylene, PTFE, into TFE), end-of-life FPs, and their risk assessment, circular economy, and regulations. Various studies are devoted to environments involving FPs, though they present a niche volume (with a yearly production of 330,300 t) compared to all plastics (with 460 million t). Complementary to other reviews on PFASs, which lack of such above data, this review presents both fundamental and applied strategies as evidenced by major FP producers.

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Section: Fluoropolymers (Ie Backbone Containing C-f Bonds) Valuable F...mentioning

confidence: 99%

Section: Fluoropolymers (Ie Backbone Containing C-f Bonds) Valuable F...mentioning

confidence: 99%

Fluoropolymers as Unique and Irreplaceable Materials: Challenges and Future Trends in These Specific Per or Poly-Fluoroalkyl Substances

Améduri

2023

Molecules

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Proton‐conducting γ‐sulfopropyl Acrylate Tethered Halato‐Telechelic PVDF Membranes for Vanadium Redox Flow Batteries

Sharma,

Améduri,

Kulshrestha

2024

ChemElectroChem

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Advanced fluorinated proton‐conducting membrane are dominating functional macromolecules due to their high performance in electrochemical energy devices. However, the co‐ion leakage and low power densities still proposes a challenge. Herein, a novel functionally tailored polyvinylidene fluoride‐co‐(γ)‐sulfopropyl acrylate (PVDF‐g‐SA) based proton‐conducting membrane is prepared for vanadium redox flow batteries (VRFBs). The approach introduces a facile guideline to design halato‐telechelic −SO3H architectures by tethering γ‐sulfopropyl acrylate onto dehydrofluorinated PVDF. The optimized PVDF‐g‐SA‐15 exhibits proton conductivity (κmH+) of 17 mS cm−1 (akin Nafion: ~19 mS cm−1) and retained 87 % and >95 % of its properties in Fenton's reagent and 3 M H2SO4, respectively. In VRFB device, the PVDF‐g‐SA‐15 shows ∼98 % capacity utilization outperforming Nafion‐117 (∼85 %). Moreover, bearing dense ionic orientation (viz AFM phases), the potential drop rate is ~2× lower for PVDF‐g‐SA‐15 (1.4×10−3 V min−1) than that of Nafion‐117 (2.6×10−3 V min−1). Operational endurance is evaluated fit for 150 mA cm−2 showing maximum coulombic, energy and voltage efficiencies of >98 %, ∼78 %, ∼80 %, respectively. Further investigation for ~200 cycles infer excellent durability with ∼95 % property retention. Additionally, the PVDF‐g‐SA‐15 can deliver ~20 % higher power density than Nafion‐117 does. Thus, the revealed alternate membrane holds promising utility in VRFB applications.

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TFE Terpolymers: Once Promising – Are There Still Perspectives in the 21st Century: Synthesis, Characterization, and Properties‐Part I

Ok,

Steinhart,

Scheler

et al. 2024

Macromol. Rapid Commun.

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Polytetrafluoroethylene (PTFE) exhibits outstanding properties such as high‐temperature stability, low surface tension, and chemical resistance against most solvents, strong acids, and bases. However, these traits make it challenging to subject PTFE to standard polymer processing procedures, such as thermoforming and hot incremental forming. While polymer processing at temperatures above the melting point of PTFE is already demanding, the typically large molar mass of PTFE results in extremely high melt viscosities, complicating the processing of PTFE. Also, PTFE tends to decompose at temperatures close to its melting point. Therefore, fluoropolymers obtained by copolymerizing tetrafluoroethylene (TFE) with various co‐monomers are studied as alternatives to PTFE (e.g., fluorinated ethylene‐propylene (FEP)), combining its advantages with better processability. TFE terpolymers have emerged as desirable PTFE alternatives. This review provides an overview of the synthesis with various comonomers and microstructural analysis of PTFE terpolymers and the relationships between the microstructures of TFE terpolymers and their properties.

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Fluorinated Elastomers

Cited by 4 publications

References 38 publications

Fluoropolymers as Unique and Irreplaceable Materials: Challenges and Future Trends in These Specific Per or Poly-Fluoroalkyl Substances

Fluoropolymers as Unique and Irreplaceable Materials: Challenges and Future Trends in These Specific Per or Poly-Fluoroalkyl Substances

Proton‐conducting γ‐sulfopropyl Acrylate Tethered Halato‐Telechelic PVDF Membranes for Vanadium Redox Flow Batteries

TFE Terpolymers: Once Promising – Are There Still Perspectives in the 21st Century: Synthesis, Characterization, and Properties‐Part I

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