Preparations and Infrared Spectrum Studies of Polytetrafluoroethylene Thin Films

Zhu, Kaigui; Jian-zhong, Shi; Li, Kebin; Weiguo, Yao; Zhang, Lide

doi:10.7498/aps.46.1764

Cited by 5 publications

(1 citation statement)

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“…It can be seen from Figure 10 that FEP and PFA have more -CF 3 side groups, while the -CF 3 group of PTFE only appears at the end of the molecular chain. The PTFE and PFA coatings have weak absorption peaks near 1645 cm −1 , corresponding to the -C=O stretching vibration [28]. The -C=O group comes from the few unstable end groups such as -COOH and -COF that are generated during the preparation of fluororesin.…”

Section: Resultsmentioning

confidence: 99%

Comparative Study of Anti-Sticking Properties of Coatings for Tire Molds

Zhang

Liu²,

Wang

et al. 2022

Coatings

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To improve the anti-sticking performance of tire molds, six types of coatings (i.e., nano-ceramic coating, bilayer waterborne polytetrafluoroethylene (PTFE) coating, fluorinated ethylene propylene (FEP)-based Whitford coating, PTFE, FEP, and perfluoroalkoxy (PFA) aqueous dispersions) were selected to modify type-45 steel specimens by air spraying. Their wettability, microstructure, demolding force, and anti-fouling properties in rubber vulcanization tests were studied. The results show that the demolding forces of the coatings were at least 24% lower than that of uncoated surface. Whitford coating, PFA, and FEP coatings had zero demolding force and no pollutant residue. PTFE coating had no pollutant residue but had high demolding force. The other two coatings had poor anti-sticking property. Upon combining the surface morphology and chemical composition analysis results, the coating demolding force was related to the surface micro-morphology: smoother surfaces led to lower demolding forces, while the surface chemical composition had a direct influence on the rubber contaminant residual. The C–F bonds on the surfaces resulted in less rubber residual due to intrinsic low surface energy. X-ray photoelectron spectrometry (XPS) analysis showed that ZnS was one of the main pollutants after rubber vulcanization test.

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Section: Resultsmentioning

confidence: 99%

Comparative Study of Anti-Sticking Properties of Coatings for Tire Molds

Zhang

Liu²,

Wang

et al. 2022

Coatings

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Structure and tribological properties of Cu-PU-PTFE composite coatings prepared by low-energy electron beam dispersion with glow discharge

Liu

Zhou

Рогачев

et al. 2016

Polym. Adv. Technol.

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Polytetrafluoroethylene (PTFE) composite coatings doped copper acetate and polyurethane (PU) were prepared on rubber substrate by low‐energy electron beam dispersion technique. The effects of dopant and glow discharge treatment on the surface morphology, structure and tribological properties of the coatings were investigated. The results showed that Cu–PTFE composite coatings form uniform surface and dense column structure with spherical aggregations under glow discharge treatment. PU coating shows the large size of protuberance structure but PU–PTFE coating presents spherical structure. Both of the coatings become relative dense and smooth after discharge treatment, and Cu–PU–PTFE composite coatings possess a smoother surface and lower polar component of surface energy. Cu doping weakens the crystallinity and ordering degree of composite coatings, but glow discharge increases the ordering degree and branched structure of C―H groups. Friction experiment indicated that Cu fails to improve the wear resistance of PTFE coatings but glow discharge treatment can do it. Cu–PU–PTFE coatings after discharge treatment have the higher wear resistance and lower coefficient of friction. Copyright © 2016 John Wiley & Sons, Ltd.

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Quantitative measurement of transfer film thickness of PTFE based composites by infrared spectroscopy

Wang

Peng

et al. 2021

Tribology International

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Preparations and Infrared Spectrum Studies of Polytetrafluoroethylene Thin Films

Abstract: Polytetrafluoroethylene (PTFE) thin films have been grown successfully by rf magnetron sputtering technique. The infrared spectra of the as prepared films are consistent with those of the PTFE target. However, chains in the films become shorter than those in the bulk.

Cited by 5 publications

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Comparative Study of Anti-Sticking Properties of Coatings for Tire Molds

Comparative Study of Anti-Sticking Properties of Coatings for Tire Molds

Structure and tribological properties of Cu-PU-PTFE composite coatings prepared by low-energy electron beam dispersion with glow discharge

Quantitative measurement of transfer film thickness of PTFE based composites by infrared spectroscopy

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