The Effects of Structure on the Viscosities of Perfluoroalkyl Ethers and Amines

Brice, T. J.; Coon, R. I.

doi:10.1021/ja01108a039

Cited by 36 publications

(9 citation statements)

References 4 publications

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“…Therefore, the C/O ratio used in this correlation is calculated for the entire compound rather than just in the polymer repeating unit. Two of the compounds (E and F) were reported by Brice and Coon (1953), while the remaining four are model compounds synthesized in this program.…”

Section: Resultsmentioning

confidence: 99%

Preparation of new perfluoro ether fluids exhibiting excellent thermal-oxidative stabilities

Jones¹,

Bierschenk²,

Juhlke³

et al. 1988

Ind. Eng. Chem. Res.

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A series of low molecular weight perfluoroalkyl ethers (PFAEs) were synthesized by direct fluorination. Viscosity-temperature properties and oxidation stabilities were determined. Viscosity-temperature correlations indicated that increases in branching and increases in the size of the branching substituent caused a deterioration in viscometric properties (i.e., an increase in ASTM slope). In addition, increasing the ratio of carbon to oxygen in these compounds also increased the ASTM slope. Preliminary oxidation stability measurements indicated that highly branched PFAE fluids (i.e., those containing quaternary carbons) may be less stable than either those containing a single trifluoromethyl pendant group or those containing no branching at all. Perfluoroalkyl ethers are a class of fluids which exhibits excellent thermal and oxidative stabilities (Gumprecht,

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Section: Resultsmentioning

confidence: 99%

Preparation of new perfluoro ether fluids exhibiting excellent thermal-oxidative stabilities

Jones¹,

Bierschenk²,

Juhlke³

et al. 1988

Ind. Eng. Chem. Res.

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“…The minimal temperature dependence of k diss is expected when no oxiplex is formed; in this case k diss oc T/YJ is expected. Assuming k q as temperature-independent and with the known temperature dependence of the viscosity of perfluorohexane [43] we obtain <p;;l</Jrt~100 at 200 K.…”

Section: Delayed Fluorescence From Phenanthrene Dimersmentioning

confidence: 93%

Delayed Fluorescence of the Kautsky‐Müller Type from Liquid Solutions of Aromatic Compounds and Oxygen

Nickel

Flor

Rodríguez

1988

Ber Bunsenges Phys Chem

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Triplet‐singlet annihilation (TSA) T, + 1Δg → S1 + 3Σg− of the metastable triplet state (T1) of an aromatic compound and the metastable singlet state (1Δg) of molecular oxygen may lead to an observable delayed fluorescence (DF) S1 → S0 (DF of the Kautsky‐Müller type). A DF of this type has been observed with liquid solutions of phenanthrene and quinoxaline in perfluorohexane and of fluoranthene in 1,1,2‐trichloro‐1,2,2‐trifluoroethane in the presence of oxygen. The DF due to TSA can be kinetically distinguished from the DF due to triplet‐triplet annihilation (TTA). The results indicate a very long lifetime of 1Δg in perhalogenated alkanes. The DF from phenanthrene due to TTA can be assigned to the fluorescence from an excited dimer.

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“…The synthesis of these ethers having low volatility and high (60 to 70%) fluorine content prompted interest in their fluid characteristics, which are briefly summarized in Table II. The contribution of ether functionality to molecular flexibility (2) is evident in the low-temperature viscosities and pour points of these fluids-five have pour points below -40°F.…”

Section: CLmentioning

confidence: 94%

Polyfluoroalkyl ethers of alicyclic fluoroolefins

Gash¹

1969

J. Chem. Eng. Data

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The base-catalyzed addition of polyfluoroalkanols to perhalo-alicydic olefins yields stable polyfluoroalicydic ethers. Two series of diand triethers are obtained, depending on the identity of the vinylic halogens in the four-, five-, and six-membered ring alicydic olefins. Evidence is cited for the presence of double bond isomers only in the fiveand six-membered ring diethers. All of the diethers (but not the triethers) readily undergo chlorine addition to yield stable a-chloroethers. The fluid characteristics of these two types of ethers are compared, including the effects of ring size.IN UCLEOPHILIC displacement of halogens in alicydic perhalo-olefins by alkoxide ions yields two types of ethers, depending upon the nature of the vinylic halogen in the olefin. Most of the reported work (6,7,8,10,11,12,14,15) relates to the reactions of the perhalocyclobutene

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The Effects of Structure on the Viscosities of Perfluoroalkyl Ethers and Amines

Cited by 36 publications

References 4 publications

Preparation of new perfluoro ether fluids exhibiting excellent thermal-oxidative stabilities

Preparation of new perfluoro ether fluids exhibiting excellent thermal-oxidative stabilities

Delayed Fluorescence of the Kautsky‐Müller Type from Liquid Solutions of Aromatic Compounds and Oxygen

Polyfluoroalkyl ethers of alicyclic fluoroolefins

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