Polyphenyl Ethers as High-Temperature Radiation-Resistant Lubricants.

Mahoney, C. L.; Barnum, E. R.; Kerlin, W. W.; Sax, Karl; Saari, W. S.

doi:10.1021/je60006a013

Cited by 19 publications

(6 citation statements)

References 5 publications

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“…Next, we investigated the thermal durability of the FAS9-hybrid film as it was continuously heated from 100 to 250 °C by measuring changes in θ S and substrate TAs of a probe liquid (we refer to this test as “ in situ ” durability test). We selected phenyl ether (5P4E) as a probe liquid because it possesses excellent thermal stability. , Changes in static CAs and substrate TAs of the 5P4E probe liquid on the sample as a function of substrate temperature were used to estimate thermal “ in situ ” durability (Figure ). As shown by the closed circles, the initial θ S value of 5P4E at room temperature was 80° (Figure ) and then gradually increased with the substrate temperature.…”

Section: Results and Discussionmentioning

confidence: 99%

“…We selected phenyl ether (5P4E) as a probe liquid because it possesses excellent thermal stability. 25,58 Changes in static CAs and substrate TAs of the 5P4E probe liquid on the sample as a function of substrate temperature were used to estimate thermal "in situ" durability (Figure 10). As shown by the closed circles, the initial θ S value of 5P4E at room temperature was 80°(Figure 10) and then gradually increased with the substrate temperature.…”

Section: ■ Introductionmentioning

confidence: 99%

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Unusual Dynamic Dewetting Behavior of Smooth Perfluorinated Hybrid Films: Potential Advantages over Conventional Textured and Liquid-Infused Perfluorinated Surfaces

et al. 2013

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From a viewpoint of reducing the burden on the environment and human health, an alternative method for preparing liquid-repellent surfaces without relying on the long perfluorocarbons (C((X-1)/2)F(X), X ≥ 17) has been strongly demanded lately. In this study, we have successfully demonstrated that dynamic dewettability toward various probe liquids (polar and nonpolar liquids with high or low surface tension) can be tuned by not only controlling surface chemistries (surface energies) but also the physical (solid-like or liquid-like) nature of the surface. We prepared smooth and transparent organic-inorganic hybrid films exhibiting unusual dynamic dewetting behavior toward various probe liquids using a simple sol-gel reaction based on the co-hydrolysis and co-condensation of a mixture including a range of perfluoroalkylsilanes (FASX, C((X-1)/2)F(X)CH2CH2Si(OR)3, where X = 3, 9, 13, and 17) and tetramethoxysilane (Si(OCH3)4, TMOS). Dynamic contact angle (CA) and substrate tilt angle (TA) measurements confirmed that our FASX-hybrid films exhibited excellent dynamic dewetting properties and were mostly independent of the length of perfluoroalkyl (Rf) groups. For example, 10 μL droplets of ultralow surface tension liquids (e.g., diethyl ether (γ = 16.26 dyn/cm) and n-pentane (γ = 15.51 dyn/cm)) could move easily on our FAS9-, FAS13-, and FAS17-hybrid film surfaces at low substrate TAs (<4°) without pinning. This is comparable or superior to the best perfluorinated textured and flat surfaces reported so far. This exceptional dynamic dewetting behavior appeared only when TMOS molecules were added to the precursor solutions; we assume this is due to co-condensed TMOS-derived silica species working as spacers between the neighboring Rf chains, enabling them to rotate freely and in doing so provide a surface with liquid-like properties. This led to the distinguished dynamic dewettability of our hybrid films, regardless of the small static CAs. Our FASX-hybrid films also displayed excellent chemical and physical durability against thermal stress (~250 °C), high-temperature (150 °C) oil vapor, and various other media (perfluoro liquid, boiling water, and weak acid) without degrading their dynamic dewettability. Such exceptional durability has been rarely seen on conventional perfluorinated surfaces reported so far.

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Section: Results and Discussionmentioning

confidence: 99%

Section: ■ Introductionmentioning

confidence: 99%

Unusual Dynamic Dewetting Behavior of Smooth Perfluorinated Hybrid Films: Potential Advantages over Conventional Textured and Liquid-Infused Perfluorinated Surfaces

et al. 2013

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“…

TTHE LITERATURE contains numerous references to synthetic fluids that have properties desirable for lubricant use (2,4,6,8,9,11). During the past 10 years the increasing demand for liquids possessing good lubricity, thermal stability, oxidation-corrosion stability, low pour points, and

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confidence: 99%

Properties of Polyester Fluids with Desirable Synthetic Lubricant Characteristics.

Bohner¹,

Krimmel²,

Schmidt-Collérus³

1962

J. Chem. Eng. Data

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“…PAEs are well-known engineering thermoplastics possessing excellent thermal, chemical, radiation, and oxidative stability. , In this regard, it is reasonable that their incorporation into PF-based materials will lead to increased spectral stability. Jiang et al prepared a series of poly(aryl ether) (PAE) polymers bearing pendent alkyl-substituted oligofluorenes. , As a result of incorporating aromatic ethers (AEs) into the polymer backbone, they prepared hybrid materials exhibiting increased spectral stability when annealed in vacuum.…”

Section: Introductionmentioning

confidence: 99%

Toward Thermally, Oxidatively, and Spectrally Stable Polyfluorene-Based Materials: Aromatic Ether-Functionalized Polyfluorene

McFarlane¹,

Piercey²,

Coumont³

et al. 2009

Macromolecules

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Two unique fluorene monomers (PTE and MTE) and polyfluorene-based homopolymers (PPTE and PMTE) containing covalently linked aromatic ether (AE) moieties were synthesized via microwave Ni(0)mediated Yamamoto coupling reactions. The monomers and polymers demonstrated thermal stabilities, as determined by TGA, much higher than status quo poly(9,9′-dioctylfluorene) (PFO) (i.e., greater than 100 °C), and most importantly, the spectral emission remained stable after annealing in ambient and inert atmospheres. PPTE and PMTE were annealed in an N 2 atmosphere at 200 °C for 72 h and at 150 °C in ambient atmosphere for 1 h showing no evidence of green emission, in stark contrast to PFO. The results show that PFs with AE moieties present in the 9-position exhibit stable blue emission.

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Polyphenyl Ethers as High-Temperature Radiation-Resistant Lubricants.

Cited by 19 publications

References 5 publications

Unusual Dynamic Dewetting Behavior of Smooth Perfluorinated Hybrid Films: Potential Advantages over Conventional Textured and Liquid-Infused Perfluorinated Surfaces

Unusual Dynamic Dewetting Behavior of Smooth Perfluorinated Hybrid Films: Potential Advantages over Conventional Textured and Liquid-Infused Perfluorinated Surfaces

Properties of Polyester Fluids with Desirable Synthetic Lubricant Characteristics.

Toward Thermally, Oxidatively, and Spectrally Stable Polyfluorene-Based Materials: Aromatic Ether-Functionalized Polyfluorene

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