Properties of Polyester Fluids with Desirable Synthetic Lubricant Characteristics.

Bohner, G. E.; Krimmel, John A.; Schmidt-Collérus, J. J.

doi:10.1021/je60015a035

Cited by 36 publications

(13 citation statements)

References 4 publications

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“…These telomer distributions, which can be determined by gel permeation chromatography and by gas chromatography, are typical distributions also found for telomer acids from other a-olefins (n = 8,12,14,16,18), when prepared under similar process conditions. Some chemical characteristics of telomer acids derived from various a-olefins are shown in Table II.…”

Section: Reaction Mechanismsupporting

confidence: 63%

“…For n-fatty acids a straight line is found, irrespective of the polyol (neopentyl glycol, trimethylolpropane, pentaerythritol) (14). However, for fatty acids containing shortchain (methyl, ethyl) branched structures, viscosities are at a significantly higher level (15,16). This illustrates the effect of molecular shape: short-chain branching induces an increase in viscosity and a corresponding decrease in viscosity index.…”

Section: Telomer Acid Estersmentioning

confidence: 94%

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Telomer Acids: Monocarboxylic acids with long‐chain branching; Their derivatives, properties and potential uses in lubricants

Brederode

Klein

1984

J Americ Oil Chem Soc

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Telomer acids are synthesized by addition of acetic anhydride to a-olefins using manganese (III) acetate as a free radical initiator. The telomerization mechanism comprises initiation, propagation and termination steps. The reaction product consists of a mixture of acids having [xn + 2] carbon atoms (n: number of carbon atoms of a-olefin: x:l, 2, 3, 4 ...... ). The "first telomer" (x=l) is a linear fatty acid. Under appropriate conditions, mainly telomer acid (x:2, 3, 4 ...... ) are obtained, being a-and ?-branched monocarboxylic acids, characterized by long-chain branches. Telomer acids derived from a-olefins up to n=14 are liquids at room temperature, despite the high molecular weight. Esters of telomer acids show interesting properties in lubricant applications: low pour point, high viscosity index, low viscosity as a function of molecular weight, good thermooxidative stability and a remarkably low elastomer swell. In amino amide derivatives, the telomer acid structure gives low viscosity properties, as is, for instance, found in significant viscosity reductions by using telomer acid as coreactant in polyisobutenyl succinic anhydride-tetraethylene pentamine condensation products. Dispersancy properties of these products are retained. Telomer acid metal salts exhibit quite different solubility characteristics and rheological properties than do fatty acid salts. Calcium salts of telomer acids are readily soluble in mineral oil: the rheology of these low viscosity solutions exhibits Newtonian behavior. Solventfree magnesium salts which are liquid can be obtained. Neutral and overbased calcium salts show pour point depressing activity in paraffinic oils. For overbased calcium salts, decrease of coefficient of friction with increasing temperature has been observed.

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Section: Reaction Mechanismsupporting

confidence: 63%

Section: Telomer Acid Estersmentioning

confidence: 94%

Telomer Acids: Monocarboxylic acids with long‐chain branching; Their derivatives, properties and potential uses in lubricants

Brederode

Klein

1984

J Americ Oil Chem Soc

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“…The main components of POE are pentaerythritol esters, which can be linear chained, branched chained, and cyclic chained esters [15]. For a complete comprehension of the solubility dependence on the structure of the constituents and the possible appearance of miscibility limits, it is useful to have experimental data for pentaerythritol esters, considering also, within a homologous series the influence of differences in molar mass of various POEs.…”

mentioning

confidence: 99%

Solubility of Carbon Dioxide in Pentaerythritol Tetrabutyrate (PEC4) and Comparison with Other Linear Chained Pentaerythritol Tetraalkyl Esters

et al. 2009

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Carbon dioxide (CO 2 ) is one of the most promising natural refrigerants that can be employed as an alternative to hydrofluorocarbons (HFC), due to its low global warming potential (GWP). Nevertheless, CO 2 presents several technical problems when employed as a working fluid in refrigeration systems. In particular, the selection of the most suitable lubricant for each application is far from being resolved. The thermodynamic behavior of a CO 2 + lubricant system must be well-known for a correct oil selection. This work is part of a research project to study the solubility of CO 2 in commercial oils and their precursors. Here, solubility measurements of CO 2 in pure pentaerythritol tetrabutyrate (PEC4) between 243 K and 343 K are presented and compared with miscibility data of CO 2 in pentaerythritol tetrahexanoate (PEC6) and pentaerythritol tetraoctanoate (PEC8). The experimental data were correlated with a thermodynamic model based on a cubic equation of state with Huron-Vidal mixing rules and the UNIQUAC equation for the excess Gibbs energy at infinite pressure.

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“…For the POE oil, the main components are pentaerythritol esters, which can be linear chained, branched chained, and cyclic chained esters [6]. Figure 1 shows the chemical structure of different linear chained esters.…”

Section: Introductionmentioning

confidence: 99%

Experimental investigations for the phase equilibrium of R1234yf and R1234ze(E) with two linear chained pentaerythritol esters

Wang

Sun

Gong

2016

The Journal of Chemical Thermodynamics

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Properties of Polyester Fluids with Desirable Synthetic Lubricant Characteristics.

Abstract: 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

Cited by 36 publications

References 4 publications

Telomer Acids: Monocarboxylic acids with long‐chain branching; Their derivatives, properties and potential uses in lubricants

Telomer Acids: Monocarboxylic acids with long‐chain branching; Their derivatives, properties and potential uses in lubricants

Solubility of Carbon Dioxide in Pentaerythritol Tetrabutyrate (PEC4) and Comparison with Other Linear Chained Pentaerythritol Tetraalkyl Esters

Experimental investigations for the phase equilibrium of R1234yf and R1234ze(E) with two linear chained pentaerythritol esters

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