Kinetics of PVDF film degradation under electron bombardment

Песин, Л. А.; Morilova, V. M.; Жеребцов, Д. А.; Evsyukov, S. E.

doi:10.1016/j.polymdegradstab.2012.11.007

Cited by 16 publications

(8 citation statements)

References 9 publications

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“…The degradation of pure PVDF under X-rays or electron beam is proposed to occur through de-hydrofluorination, forming radical species such as F* and H* by-products. 26,35,36 In agreement with the literature, we observe partial fluorine loss as highlighted by the decrease of the overall F 1s area with respect to C 1s (inset panels in Figure 3a,b). Since the reaction of a CF 2 group requires the presence of an adjacent CH 2 , the kinetics of the process have been proposed to be of the second order, although the details are still not clear due to the influence of polymer crystallinity and morphology.…”

Section: Experimental Protocolssupporting

confidence: 91%

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Surface analysis insight note: Accounting for X‐ray beam damage effects in positive electrode‐electrolyte interphase investigations

Fantin,

Van Roekeghem,

Rueff

et al. 2024

Surface & Interface Analysis

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We investigated the effects of X‐ray beam damage during X‐ray photoelectron spectroscopy measurement on LiNiO2 electrodes. The degree of damage induced by lab‐based and synchrotron X‐ray radiation has been compared between pristine and cycled electrodes, highlighting the role of positive solid electrode–electrolyte interphase to protect the cycled LiNiO2 surface from beam damage. The possible steps to avoid or at least reduce the beam‐induced effects are outlined.

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Section: Experimental Protocolssupporting

confidence: 91%

“…by normalizing each data point to the initial total area. The fitted parameters are the kinetic constant k and the parameter b, correcting for the initial nonreactive CF 2 35 (Table 2). As shown in Figure 3a, both the decrease of CF 2 groups and the increase of LiF are well-fitted by this formula.…”

Section: Experimental Protocolsmentioning

confidence: 99%

Surface analysis insight note: Accounting for X‐ray beam damage effects in positive electrode‐electrolyte interphase investigations

Fantin,

Van Roekeghem,

Rueff

et al. 2024

Surface & Interface Analysis

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“…The mechanical stability of the particle network guaranteed by the polyvinylidene fluoride (PVDF) can also be affected. Inded, in other fields, the beam-induced damages of PVDF are known and used to synthesize carbyne, for example. − The graphite absorption being weak, it explains why PVDF or electrolyte in the NMC electrode is damaged whereas it is not, or occurs later, in the graphite electrode. Cross-linking, crystallization, and production of radicals are some of the many possibilities of beam-induced electrolyte aging. ,, From this perspective, the chosen X-ray technique does not matter in the extent of damages, but its sensitivity may affect the onset dose value from which the degradations are visible.…”

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confidence: 99%

How Beam Damage Can Skew Synchrotron Operando Studies of Batteries

et al. 2023

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With the advent of high-brilliance synchrotron sources, the issue of beam damage on the samples deserves proper attention. It is especially true for operando studies in batteries, since the intense photon fluxes are commonly used to probe ever finer effects. Here we report on the causes and consequences of synchrotron X-ray beam damage in batteries, based on the case study of operando X-ray diffraction. We show that beam damage is caused by the mingled actions of dose and dose rate. The aftereffects can lie in a broad range, from mild modifications of the crystalline structure to artificial phase transitions, and can thus impede or bias the understanding of the mechanisms at play. We estimate the doses at which the different effects appear in two materials, suggesting that it could be expanded to other materials with the same technology. We also provide recommendations for the design of operando synchrotron experiments.

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“…Meanwhile, another characteristic absorption peak also appeared at 1720 cm -1 , resulting from the carbonyl stretching vibration produced by the oxidation reaction. There have been some studies on the degradation process of PVDF, which mainly includes oxidation reaction and the decomposition of HF [49][50][51][52].…”

Section: Surface Morphologymentioning

confidence: 99%

Degradation of PVDF-Coated Fabrics after Engineering Applications: Correlations between Surface Microstructure, Physical Properties, and Mechanical Properties Based on Statistical Analysis

Shang

Yang

et al. 2021

Advances in Polymer Technology

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Material degradation has marked impact on the long-term properties and service life of membrane structures. This study is aimed at assessing and understanding the deterioration in visual aspect, surface microstructure, and mechanical properties of a polyvinylidene fluoride (PVDF) polymer after engineering applications. Three groups of PVDF-coated fabrics were removed from different membrane structures in China, which have been used for 15, 16, and 19 years, respectively. Firstly, spectrocolorimetry tests were carried out to determine the evolution of chromaticity and lightness. Other methods such as contact angle and thickness measurements were used to characterize the physical properties. Then, surface morphology was observed by using scanning electron microscope (SEM) technology. Moreover, a series of uniaxial tensile tests and tearing tests were performed to obtain the mechanical indicators including uniaxial tensile strength, strain at break, tearing strength, and uniaxial elastic modulus. In order to further study the degradation mechanism, infrared spectroscopy was used to characterize the molecular structure of aged fabrics. Finally, Principal Component Analysis (PCA) provided a comprehensive description of correlations between surface microstructure, physical properties, and mechanical properties. This paper offers a further understanding of the design, qualification, and durability evaluation of membrane structures.

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Kinetics of PVDF film degradation under electron bombardment

Cited by 16 publications

References 9 publications

Surface analysis insight note: Accounting for X‐ray beam damage effects in positive electrode‐electrolyte interphase investigations

Surface analysis insight note: Accounting for X‐ray beam damage effects in positive electrode‐electrolyte interphase investigations

How Beam Damage Can Skew Synchrotron Operando Studies of Batteries

Degradation of PVDF-Coated Fabrics after Engineering Applications: Correlations between Surface Microstructure, Physical Properties, and Mechanical Properties Based on Statistical Analysis

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