Esters of Aromatic Alcohols and Dibasic Acids as Base Stocks for Nonspreading Oil Compositions.

Portnoy, Seymour; Verderame, F.; Messina, Joseph; Gisser, Henry

doi:10.1021/i460004a024

Cited by 16 publications

(3 citation statements)

References 4 publications

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“…Nonspreading oils are not new [1,2,8,10,11]. Earlier work in this laboratory [6] has established criteria for spreading or nonspreading of liquids on solid surfaces.…”

mentioning

confidence: 99%

Effect of Polar-Nonpolar Additives on Oil Spreading on Solids, with Applications to Nonspreading Oils

Cottington

Murphy

Singleterry

1964

Advances in Chemistry

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Nonspreading oils can be prepared from many lubricating oils by proper choice of an adsorbable additive, but an additive that makes one oil nonspreading may cause violent spreading of another. This anomalous spreading is produced by surface tension gradients resulting from adsorptive depletion of additive along the edge of the drop. Oily contamination of a surface may also cause spreading of an otherwise nonspreading oil. Since contamination rarely produces a critical surface tension above 30 dynes per cm., a practical nonspreading oil should have a surface tension above this value. Effective additives for nonspreading include the silicones, fluoroesters, amine-organic acid salts, high molecular weight organic acids, alcohols, or amines, and some oil-soluble soaps. A predeposited film of a polysiloxane prevents the spreading of most oils on metal surfaces.For an important group of applications the spreading characteristic of a lubricating oil may be as important as its viscosity, oxidation stability, or boundary lubricity. This has long been recognized by watchmakers, who require an oil that will not spread from jewel bearings to the hair spring, where it may alter the escapement rate. Jeweled bearings in meters for military electrical equipment require a similar lubricant. The nonspreading property of oil is also important because it minimizes evaporation; a drop of oil after spreading may expose as much as a thousand times the original surface. A drop of a good nonspreading oil will remain almost undiminished on a test plate for a year or more, whereas a spreading oil of equal volatility will be lost completely within one or two weeks. A spreading oil film is also undesirable

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“…Nonspreading oils are not new [1,2,8,10,11]. Earlier work in this laboratory [6] has established criteria for spreading or nonspreading of liquids on solid surfaces.…”

mentioning

confidence: 99%

Effect of Polar-Nonpolar Additives on Oil Spreading on Solids, with Applications to Nonspreading Oils

Cottington

Murphy

Singleterry

1964

Advances in Chemistry

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“…in diameter was placed on a 1-inch diameter W.D. 52-100 steel disk hardened to Rockwell C-62, which had been cleaned and polished by a method described in the literature (9).…”

Section: Methodsmentioning

confidence: 99%

“…52-100 steel disk hardened to Rockwell C-62, which had been cleaned and polished by a method described in the literature (9). 52-100 steel disk hardened to Rockwell C-62, which had been cleaned and polished by a method described in the literature (9).…”

Section: Spreading Determination a Drop Of Fluid 1 To 2 MM Inmentioning

confidence: 99%

Substituted Biphenyls and Terphenyls as Oxidatively Autoinhibitive Compounds

Mertwoy¹,

Gisser²

1967

I&EC Product Research and Development

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small endothermic peak beginning at about 100' C. in both thermograms is the glass transition. Curve A shows no peaks after the glass peak until the large peak of thermal degradation begins at 300' C. Curve B, however, shows a n exotherm beginning at about 240' C. This peak continues until the endothermic degradation peak becomes dominant. This exotherm is possibly the reaction of oxygen from the air with polystyrene to form polystyrene hydroperoxide as described by Boundy. The samples both weighed about 10 mg. and therefore degradation peaks of approximately the same size should be expected. Since the degradation peak of curve B is smaller, it appears that the exothermic oxidation is present at higher temperatures and reduces the size of the endothermic degradation peak. ConclusionsSome of the factors affecting glass transitions of polystyrene have been examined with a series of commercial and standard samples using a modern DTA instrument. Thermal degradation was also observed. These observations indicate that DTA is a useful tool for studying glass transitions and thermal deg-radation characteristics. Present equipment is sensitive enough to permit more extensive study of the variables affecting these phenomena, and the ease in conducting the tests suggests all the more strongly the routine use of DTA in quality control. AcknowledgmentWe are most grateful to W. C. Brasie, Dow Chemical Co., Midland, Mich., for furnishing commercial samples of polystyrene. We are indebted to Robert L. Stone for the use of DTA equipment of the Robert L. Stone Co.In a study of oxidatively autoinhibitive biphenyls and terphenyls, sec-butylbenzenes having phenyl, methoxyphenyl, sec-butylphenyl, or tert-butylphenyl substituted in the ring, either singly or in combination, were prepared, and their autoxidation rates measured at 100' C. Whereas sec-butylbenzene oxidized in less

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Pure Liquids: Extended References

Wohlfarth¹,

Wohlfarth²

Refractive Indices of Inorganic, Organometallic, and Organononmetallic Liquids, and Binary Liquid Mixtures

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Esters of Aromatic Alcohols and Dibasic Acids as Base Stocks for Nonspreading Oil Compositions.

Cited by 16 publications

References 4 publications

Effect of Polar-Nonpolar Additives on Oil Spreading on Solids, with Applications to Nonspreading Oils

Effect of Polar-Nonpolar Additives on Oil Spreading on Solids, with Applications to Nonspreading Oils

Substituted Biphenyls and Terphenyls as Oxidatively Autoinhibitive Compounds

Pure Liquids: Extended References

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