Perturbing effects of bulky comonomers on the chain conformation of poly(vinylidene fluoride)

Yang, Yuning; Ramalingam, Suriyakala; Wu, Guolin; Hsu, Shaw Ling; Kleiner, Lothar W.; Tang, Fuh-Wei; Ding, Nadine; Hossainy, Syed

doi:10.1016/j.polymer.2008.02.015

Cited by 12 publications

(6 citation statements)

References 40 publications

(33 reference statements)

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“…8,9 The PVDF-HFP copolymer is often employed to form a polymer gel swollen with an IL, wherein the semicrystalline phase of PVDF segments serves as a cross-linking point in the polymer network. [10][11][12] The HFP components enhance the amorphous domains of the copolymer, resulting in a high IL uptake and a higher ionic conductivity on the order of 10 −4 -10 −3 S cm −1 at room temperature. However, even highly ion-conductive IL-based gel electrolytes have a low Li + transference number, which is a typical shortcoming of IL-based electrolytes.…”

Section: Introductionmentioning

confidence: 99%

Electrochemical Properties of Poly(vinylidene fluoride-<i>co</i>-hexafluoropropylene) Gel Electrolytes with High-Concentration Li Salt/Sulfolane for Lithium Batteries

et al. 2021

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Combining highly concentrated electrolytes with a polymer network is a valid approach to simultaneously achieve fast Li + ion transport, high thermal stability, and a wide electrochemical window in a quasi-solid-state form. In this work, flexible gel electrolytes comprising commercially available poly(vinylidene fluoride-co-hexafluoropropylene) (PVDF-HFP) and highly concentrated electrolytes of Li salts/sulfolane (SL) were prepared by a simple solution casting method. The anionic effects of the gel electrolytes on the Li-ion conductivity and charge transfer kinetics at the gel/electrode interface were investigated. The SL-based gel electrolyte with lithium bis(fluorosulfonyl)amide (LiFSA) showed an ionic conductivity of 0.7 mS cm −1 and a high Li transference number (> 0.5) at 30 °C. The charge transfer resistance in a [Li/gel/LiCoO2] cell with LiFSA was lower than that of the cells with lithium bis(trifluoromethanesulfonyl)amide (LiTFSA) or LiBF4, indicating faster interfacial charge transfer kinetics in the gel electrolyte with FSA. The Li/LiCoO2 cell with the LiFSA/SL gel electrolyte exhibited a higher capacity than that of the cells with the LiTFSA/SL and LiBF4/SL gel electrolytes. Hence, rationally designed gel electrolytes containing highly concentrated SL-based electrolytes enable the high rate performance of Li batteries.

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Section: Introductionmentioning

confidence: 99%

Electrochemical Properties of Poly(vinylidene fluoride-<i>co</i>-hexafluoropropylene) Gel Electrolytes with High-Concentration Li Salt/Sulfolane for Lithium Batteries

et al. 2021

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“…Poly(vinylidene fluoride) (PVDF) is a widely known fluorinated polymer due to its high piezoelectric constant and has been used for commercial electromechanical devices such as speakers and microphones 19. Monolayers of fluorinated organic molecules exhibit low free surface energies leading to applications ranging from tribologically active coatings20 to paints in marine technology for the prevention of biofouling 21.…”

Section: Introductionmentioning

confidence: 99%

“…17 Fluorinated polyimide/poly(propylene oxide) membranes proved to be a promising material due to their low dielectric constant, since their pores remained stable even at temperatures above 300 C. 18 Poly(vinylidene fluoride) (PVDF) is a widely known fluorinated polymer due to its high piezoelectric constant and has been used for commercial electromechanical devices such as V C 2011 Wiley Periodicals, Inc. speakers and microphones. 19 Monolayers of fluorinated organic molecules exhibit low free surface energies leading to applications ranging from tribologically active coatings 20 to paints in marine technology for the prevention of biofouling. 21 Fluorine based polymers combine low surface energy with mechanical stability exhibiting interesting optical and electrical properties.…”

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confidence: 99%

Synthesis, molecular, and morphological characterization of initial and modified diblock copolymers with organic acid chloride derivatives

Politakos

Weinman

Paik

et al. 2011

J. Polym. Sci. A Polym. Chem.

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Six well defined PS-b-PB 1,2 diblock copolymers (PS: polystyrene and PB: polybutadiene) with almost 100% of 1,2 microstructure for the PB segment were synthesized. Size exclusion chromatography (SEC), membrane osmometry (MO) and proton nuclear magnetic resonance spectroscopy (1 H NMR) were used for verification of the molecular characteristics and the 100%-1,2 addition for the PB blocks. Modification with heptanoyl or pentadecafluorooctanoyl chloride was accomplished via hydroboration and subsequent oxidation, leading to hydroxylated PB blocks and was verified with 1 H NMR and Fourier transform infrared (FTIR) spectroscopy. Only two samples were modified with both organic acid chloride derivatives. Structural characterization was accomplished via transmission electron mi-croscopy (TEM) and small-angle X-ray scattering (SAXS) in all cases. The self-assembly was more evident in the modified copolymers with the corresponding halides due to the increase of the molecular weight of the modified PB block. Taking into consideration the vN values in each case and comparing the results with those of PS-b-PI copolymers already reported in the literature the discrepancies with the theoretical predictions are very small or minimal. V

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“…Indeed, these copolymers have a high solubility, a low degree of crystallinity, and a low glass transition temperature. [2] On larger scales, they have good thermal properties and chemical inertness to acids and petroleum. [3] The study of aging under controlled conditions makes it possible to better identify the degrading factors, to understand the effect of changes in molecular structure on mechanical properties, and finally to determine the degradation mechanisms.…”

Section: Introductionmentioning

confidence: 99%

Degradation of PVDF‐HFP Matrix

Julienne

Richaud

2022

Macromolecular Symposia

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This paper explores both physical ageing of polyvinylidene fluoride (PVDF) and its copolymers with hexafluoropropylene (HFP). Water ageing and annealing are shown to have a negligible influence on mechanical properties. Chemical ageing is thus expected to be the main source of long‐term degradation. The nature of associated chemical trackers is discussed but it seems clear that their fraction is very slow for low temperature thermal ageing.

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Perturbing effects of bulky comonomers on the chain conformation of poly(vinylidene fluoride)

Cited by 12 publications

References 40 publications

Electrochemical Properties of Poly(vinylidene fluoride-<i>co</i>-hexafluoropropylene) Gel Electrolytes with High-Concentration Li Salt/Sulfolane for Lithium Batteries

Electrochemical Properties of Poly(vinylidene fluoride-<i>co</i>-hexafluoropropylene) Gel Electrolytes with High-Concentration Li Salt/Sulfolane for Lithium Batteries

Synthesis, molecular, and morphological characterization of initial and modified diblock copolymers with organic acid chloride derivatives

Degradation of PVDF‐HFP Matrix

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