Thermal-mechanical stability of ethylene tetrafluoroethylene alternating copolymer, and modification thereof

Yuan, Wang Zhang; Zhao, Junhong; Yang, Lei; Li, Hong; Li, Lei; Zhang, Yongming

doi:10.1007/s10965-011-9820-2

Cited by 6 publications

(2 citation statements)

References 41 publications

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“…Several studies have focused on the degradation of PVDF and ETFE. − However, most of the previous studies examined the thermal stability or aging characteristics of the polymers; none focused on their decomposition to obtain F – ions for waste treatment. Only one report, a patent describing monomer production for numerous polymers in supercritical water, noted PVDF as an applicable species, but no specific results were shown.…”

Section: Introductionmentioning

confidence: 99%

Efficient-Oxygen Induced Mineralization of Melt-Processable Fluoropolymers in Subcritical and Supercritical Water

Hori

Sakamoto

Ohmura

et al. 2014

Ind. Eng. Chem. Res.

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The decomposition of poly(vinylidene fluoride) (PVDF) and ethylene–tetrafluoroethylene copolymer (ETFE) in subcritical and supercritical water was investigated. Heating PVDF in supercritical water at 380 °C for 6 h with an approximately 5.8-fold molar excess of O2 relative to the fluorine or carbon content in the polymer afforded F– and CO2 in 96.9% and 99.3% yields, respectively. ETFE was also efficiently mineralized to F– (97.6%) and CO2 (98.2%) with an 11-fold molar excess of O2 relative to the fluorine or carbon content of the polymer under the same reaction conditions. The PVDF and ETFE reactivities differed markedly under argon: PVDF formed mainly F–, CO2 formation was suppressed, and a carbon-rich residue formed; in contrast, ETFE was unreactive. This difference suggests that PVDF decomposed via dehydrofluorination in the absence of O2, whereas ETFE did not. Adding stoichiometric Ca(OH)2 to the reaction in the presence of O2 afforded X-ray spectrometrically pure CaF2.

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Section: Introductionmentioning

confidence: 99%

Efficient-Oxygen Induced Mineralization of Melt-Processable Fluoropolymers in Subcritical and Supercritical Water

Hori

Sakamoto

Ohmura

et al. 2014

Ind. Eng. Chem. Res.

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“…Figure 1 also shows that ETFE is a highly crystalline polymer, crystallinity level based on melt curve is 52.5 %, while on crystallization curve 49.2 %. In addition, we have confirmed that ETFE would degrade as temperature was above 300°C [25]. Based on the above mentioned evidence, we select 270-300°C as experimental temperature range.…”

Section: Resultsmentioning

confidence: 81%

Melt rheological properties of ETFE: an attempt to illuminate the fluorine-substitution effect

Yuan

et al. 2012

Polym. Bull.

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Flow behaviors and rheological properties of ethylene tetrafluoroethylene alternating copolymer (ETFE) under high-shear conditions were first reported. Flow instabilities, shear and extensional viscosities, and die swell of ETFE were investigated. Rheological behaviors of perfluorinated ethylene propylene copolymers (FEP), partially fluorinated ETFE, and non-fluorinated polyethylenes (PE) were compared for understanding the role of fluorine incursion on materials properties. It is found that (1) ETFE does not have sharkskin region or second smooth region which frequently occurs in FEP and linear PE; (2) critical shear stresses at which surface melt fracture occurs for the three polymers follow the order: FEP \ ETFE \ PE; (3) stable flow region narrows, die swell weakens, and flow activation energy increases when fluorine content of polymer increases. After time-temperature superposition, shifted shear viscosity, extensional viscosity, and elastic data (die swell) present universal scaling characteristic and superpose well in term of the same shift factors.

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Analysis of the chemical behavior at the molecular level of lined pipes with fluoropolymers in a sodium hypochlorite production line/bibliographic review

Rosero¹,

Rodríguez²,

Fonseca³

2022

SN Appl. Sci.

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This case study is about finding the best fluoropolymer coating for pipes that resists the sodium hypochlorite continue production, which is one of the most aggressive chemical processes that can lead to molecular attack in reactors made by lined pipes. There are several types of coatings pipe such as fiberglass, polymers and elastomers, but the fluoropolymers which have unique properties that make them resistant to chemical attack. In this production process, the premature deterioration of coating pipes is common, due to the expansion of chlorine at the inlet of the reactor, caused by the reaction of chlorine–sodium hydroxide, this is the critical point of the process. Some problems that we find is the chemical attack in that some fluoropolymers coating suffer premature degradation caused by the chemical compatibility, in this case, we explain in detail the chemical and molecular composition of each of the fluoropolymers and how this change occurs at the molecular level. While the lined pipes are the best economical option for chemicals applications, however, it is important to know the correct coating to ensure a long lifetime and avoid piping changes due to premature degradation. Based on the findings of the chemical resistance of each fluoropolymer under study, it is determined which is the best fluoropolymer that resists continuous production of sodium hypochlorite. Results were obtained by a systematic review of the literature.

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Thermal-mechanical stability of ethylene tetrafluoroethylene alternating copolymer, and modification thereof

Cited by 6 publications

References 41 publications

Efficient-Oxygen Induced Mineralization of Melt-Processable Fluoropolymers in Subcritical and Supercritical Water

Efficient-Oxygen Induced Mineralization of Melt-Processable Fluoropolymers in Subcritical and Supercritical Water

Melt rheological properties of ETFE: an attempt to illuminate the fluorine-substitution effect

Analysis of the chemical behavior at the molecular level of lined pipes with fluoropolymers in a sodium hypochlorite production line/bibliographic review

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