Synthesis of polymeric lubricating films directly at the sliding interface via mechanochemical reactions of allyl alcohols adsorbed from the vapor phase

Barthel, Anthony J.; Combs, Daniel R.; Kim, Seong H.

doi:10.1039/c4ra02283a

Cited by 17 publications

(32 citation statements)

References 31 publications

(31 reference statements)

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“…For self-mated stainless steel sliding contact, allyl alcohol gave a friction coefficient of ~0.2 at a vapor partial pressure of 15% and higher, which is much lower than the friction of stainless steel in dry condition (higher than 1). It was also found that the adsorbed allyl alcohol molecules were polymerized only within the contact area during sliding [225]. No wear was found after sliding was stopped indicating that the tribo-products were not by-products of stainless steel wear.…”

Section: Mechanochemical Synthesis Of Nano-lubricant Films From Vapormentioning

confidence: 80%

“…No wear was found after sliding was stopped indicating that the tribo-products were not by-products of stainless steel wear. Unlike the wearinduced tribo-polymerization of adsorbed pentanol vapor on silicon oxide [216], the formation of allylalcohol tribo-product was attributed to polymerization of the unsaturated C=C bond to form a polymerized alcohol [225]. When allyl alcohol vapor flow was stopped, the tribo-polymer was sufficient to lubricate the sliding contact.…”

Section: Mechanochemical Synthesis Of Nano-lubricant Films From Vapormentioning

confidence: 93%

“…This was demonstrated for allyl alcohol vapor lubrication for stainless steel surfaces [225]. For self-mated stainless steel sliding contact, allyl alcohol gave a friction coefficient of ~0.2 at a vapor partial pressure of 15% and higher, which is much lower than the friction of stainless steel in dry condition (higher than 1).…”

Section: Mechanochemical Synthesis Of Nano-lubricant Films From Vapormentioning

confidence: 99%

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Vapors in the ambient—A complication in tribological studies or an engineering solution of tribological problems?

et al. 2015

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Tribology involves not only two-body contacts of two solid materials-a substrate and a counter-surface; it often involves three-body contacts whether the third body is intentionally introduced or inevitably added during the sliding or rubbing. The intentionally added third body could be lubricant oil or engineered nanomaterial used to mitigate the friction and wear of the sliding contact. The inevitably added third body could be wear debris created from the substrate or the counter surface during sliding. Even in the absence of any solid third-body between the sliding surfaces, molecular adsorption of water or organic vapors from the surrounding environment can dramatically alter the friction and wear behavior of solid surfaces tested in the absence of lubricant oils. This review article covers the last case: the effects of molecular adsorption on sliding solid surfaces both inevitably occurring due to the ambient test and intentionally introduced as a solution for engineering problems. We will review how adsorbed molecules can change the course of wear and friction, as well as the mechanical and chemical behavior, of a wide range of materials under sliding conditions.

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Section: Mechanochemical Synthesis Of Nano-lubricant Films From Vapormentioning

confidence: 80%

Section: Mechanochemical Synthesis Of Nano-lubricant Films From Vapormentioning

confidence: 93%

Section: Mechanochemical Synthesis Of Nano-lubricant Films From Vapormentioning

confidence: 99%

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Vapors in the ambient—A complication in tribological studies or an engineering solution of tribological problems?

et al. 2015

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“…[13,14,18] Recently, it has been shown that allyl alcohol adsorbed on stainless steel could be polymerized under interfacial shear conditions. [19] Even though allyl alcohol has a double bond, it does not undergo typical radical polymerization in thermal reaction conditions. [20] However, it was easily polymerized under the mechanical shear condition.…”

Section: Introductionmentioning

confidence: 99%

“…More interestingly, the tribo-polymer produced from allyl alcohol at the sliding track acted as a boundary lubrication film for an extended period of time without continuous supply of lubricant vapor. [19] In this paper, we report tribochemical reactions of α-pinene (C 10 H 16 ) and pinane (C 10 H 18 ).…”

Section: Introductionmentioning

confidence: 99%

Tribochemical synthesis of nano-lubricant films from adsorbed molecules at sliding solid interface: Tribo-polymers from α-pinene, pinane, and n-decane

Barthel

Kim

2016

Surface Science

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The mechanochemical reactions of adsorbed molecules at sliding interfaces were studied for αpinene (C 10 H 16), pinane (C 10 H 18), and n-decane (C 10 H 22) on a stainless steel substrate surface. During vapor phase lubrication, molecules adsorbed at the sliding interface could be activated by mechanical shear. Under the equilibrium adsorption condition of these molecules, the friction coefficient of sliding steel surfaces was about 0.2 and a polymeric film was tribochemically produced. The synthesis yield of α-pinene tribo-polymers was about twice as much as pinane tribo-polymers. In contrast to these strained bicyclic hydrocarbons, n-decane showed much weaker activity for tribo-polymerization at the same mechanical shear condition. These results suggested that the mechanical shear at tribological interfaces could induce the opening of the strained ring structure of -pinene and pinane, which leads to polymerization of adsorbed molecules at the sliding track. On a stainless steel surface, such polymerization reactions of adsorbed molecules do not occur under typical surface reaction conditions. The mechanical properties and boundary lubrication efficiency of the produced tribo-polymer films are discussed.

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Relating Tribological Performance and Tribofilm Formation to the Adsorption Strength of Surface-Active Precursors

Khan

et al. 2019

Tribol Lett

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Synthesis of polymeric lubricating films directly at the sliding interface via mechanochemical reactions of allyl alcohols adsorbed from the vapor phase

Abstract: Friction initially occurs in a vapor environment, during which a triboproduct is formed. This triboproduct lubricates in absence of the vapor for over 30 000 reciprocating cycles.

Cited by 17 publications

References 31 publications

Vapors in the ambient—A complication in tribological studies or an engineering solution of tribological problems?

Vapors in the ambient—A complication in tribological studies or an engineering solution of tribological problems?

Tribochemical synthesis of nano-lubricant films from adsorbed molecules at sliding solid interface: Tribo-polymers from α-pinene, pinane, and n-decane

Relating Tribological Performance and Tribofilm Formation to the Adsorption Strength of Surface-Active Precursors

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