Adsorbed film structure and tribological performance of aqueous copolymer lubricants with phosphate ester additive on Ti coated surface

Adsorbed film structure and tribological performance of aqueous copolymer lubricants with... The adsorption of aqueous tri-block reverse copolymer polypropylene oxide–polyethylene oxide–polypropylene oxide, PPO–PEO–PPO with phosphate ester on Ti coated surfaces have been studied using a neutron reflectometer (NR). It is found that the adsorbed film consists of two layers. The hydrophobic PPO block forms the inner layer and acts as the anchor of the adsorbed film. Copolymer with higher weight percentage of PPO forms a thicker PPO layer. Phosphate ester affects the adsorbed film structure of PPO–PEO–PPO copolymer by forming a thicker mixed-layer of PPO and phosphate ester on the Ti surface. The tribological performance of the lubricants has also been studied using a ball-on-disc tribometer. The results show that copolymer molecular structure affects lubrication performance. Tri-block copolymer with a higher weight percentage of PPO shows a better performance. The addition of phosphate ester to tri-block copolymer solution not only significantly decreases the coefficient of friction but also increases anti-wear property. The finding indicates that adsorbed film thickness depends on the size of the PPO block and the presence of phosphate ester, and that adsorbed film thickness correlates with friction. http://www.deepdyve.com/assets/images/DeepDyve-Logo-lg.png Wear Elsevier

Adsorbed film structure and tribological performance of aqueous copolymer lubricants with phosphate ester additive on Ti coated surface

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Publisher
Elsevier
Copyright
Copyright © 2015 Elsevier B.V.
ISSN
0043-1648
eISSN
1873-2577
D.O.I.
10.1016/j.wear.2015.01.042
Publisher site
See Article on Publisher Site

Abstract

The adsorption of aqueous tri-block reverse copolymer polypropylene oxide–polyethylene oxide–polypropylene oxide, PPO–PEO–PPO with phosphate ester on Ti coated surfaces have been studied using a neutron reflectometer (NR). It is found that the adsorbed film consists of two layers. The hydrophobic PPO block forms the inner layer and acts as the anchor of the adsorbed film. Copolymer with higher weight percentage of PPO forms a thicker PPO layer. Phosphate ester affects the adsorbed film structure of PPO–PEO–PPO copolymer by forming a thicker mixed-layer of PPO and phosphate ester on the Ti surface. The tribological performance of the lubricants has also been studied using a ball-on-disc tribometer. The results show that copolymer molecular structure affects lubrication performance. Tri-block copolymer with a higher weight percentage of PPO shows a better performance. The addition of phosphate ester to tri-block copolymer solution not only significantly decreases the coefficient of friction but also increases anti-wear property. The finding indicates that adsorbed film thickness depends on the size of the PPO block and the presence of phosphate ester, and that adsorbed film thickness correlates with friction.

Journal

WearElsevier

Published: May 1, 2015

References

  • Aqueous lubrication of polymers: influence of surface modification
    Lee, S.; Spencer, N.D.
  • Tribological performance of aqueous copolymer lubricant in loaded contact with Si and coated Ti film
    Lin, B.J.; Tieu, A.K.; Zhu, H.T.; Kosasih, B.; Novareza, O.; Triani, G.
  • Thickness and density of adsorbed additive layer on metal surface in lubricant by neutron reflectometry
    Hirayama, T.; Torii, T.; Konishi, Y.; Maeda, M.; Matsuoka, T.; Inoue, K.; Hino, M.; Yamazaki, D.; Takeda, M.
  • In situ analysis of alkyl phosphate surfactant adsorption at the alumina/aqueous solution interface
    Jeon, J.S.; Sperline, R.P.; Raghavan, S.; Hiskey, J.B.
  • Mesoscale simulation of block copolymers in aqueous solution: parameterisation, micelle growth kinetics and the effect of temperature and concentration morphology
    Lam, Y.M.; Goldbeck-Wood, G.
  • The search for the hydrophobic force law
    Hammer, M.U.; Anderson, T.H.; Chaimovich, A.; Shell, M.S.; Israelachvili, J.
  • Tribological performance of magnetic thin-film glass disks: its relation to surface roughness and lubricant structure and its thickness
    Gao, C.; Bhushan, B.

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