The tribological behavior of ultrathin films of hydroxyl terminated perfluoropolyethers attached to smooth silicon surfaces was studied in pin-on-disk experiments. The frictional properties of the films, which consisted of either physically adsorbed or chemically bonded polymer or a combination of both, was measured in sliding contact and lubricant loss was studied simultaneously by scanning microellipsometry. Prior to these experiments the kinetics of attachment of the polymer to silicon surfaces and the behavior of the polymer at high temperatures was investigated in order to obtain reproducible conditions for the deposition of the lubricant films and to rule out the occurrence of thermal degradation during film deposition. The tribological investigations showed that the lifetime of the surfaces with the attached boundary lubricant was strongly dependent on the mode of attachment of the polymer. The best tribological behavior was observed in films which contained both chemisorbed and physically adsorbed material.

1.
Ando
E.
,
Goto
Y.
,
Morimoto
K.
,
Ariga
K.
, and
Okahata
Y.
,
1989
, “
Frictional Properties of Monomolecular Layers of Silane Compounds
,”
Thin Solid Films
, Vol.
180
, pp.
287
291
.
2.
Barlow
M.
,
Braitberg
M.
,
Davis
L.
,
Dunn
V.
, and
Frew
D.
,
1987
, “
Duplex Reactive Fluorocarbon Films With Spin-Off Resistant Characteristics
,”
IEEE Transactions on Magnetics
, Vol.
23
, p.
33
33
.
3.
Bhushan
B.
,
1990
, “
Magnetic Media Tribology: State of the Art and Future Challenges
,”
Wear
, Vol.
136
, pp.
169
197
.
4.
Buchholz
F. L.
, and
Wilson
L. R.
,
1986
, “
High-Shear Reology and Shear Degradation of Aqueous Polymer Solutions
,”
Journal of Applied Polymer Science
, Vol.
32
, pp.
5399
5413
.
5.
DePalma
V.
, and
Tillmann
N.
,
1989
, “
Friction and Wear of Self-Assembled Trichlorosilane Monolayer Films on Silicon
,”
Langmuir
, Vol.
5
, pp.
868
872
.
6.
Homola
A.
,
Mate
M.
, and
Street
G. B.
,
1990
, “
Overcoats and Lubrication for Thin Film Disks
,”
MRS Bull
, Vol.
15
, pp.
45
52
.
7.
Iler, R. K., 1979, The Chemistry of Silica, J. Wiley, New York, p. 692.
8.
Jones
W. R.
,
Paciorek
K. J. L.
,
Ito
T. I.
, and
Krather
R. H.
,
1983
, “
Thermal Oxidative Degradation Reactions of Linear Perfluoroalkylethers
,”
Industrial and Engineering Chemistry Product Research and Development
, Vol.
22
, pp.
166
170
.
9.
Karis
T. E.
,
Novotny
V. J.
, and
Johnson
R. D.
,
1993
, “
Mechanical Scission of Perfluoropolyethers
,”
Journal of Applied Polymer Science
, Vol.
50
, pp.
1357
1368
.
10.
Merchant
K.
,
Mee
P.
,
Smallen
M.
,
Smith
S.
,
1990
, “
Lubricant Bonding and Orientation on Carbon Coated Media
,”
IEEE Transactions on Magnetics
, Vol.
26
, pp.
2688
2690
.
11.
Miyamoto, T., Sato, I., and Ando, Y., 1988, Tribology and Mechanics of Magnetic Storage Systems, Vol. 5, B. Bhushan and N. S. Eiss, eds., STLE Special Publication SP-25, p. 55.
12.
Novotny
V. J.
,
Swalen
J. D.
, and
Rabe
J. P.
,
1989
, “
Tribology of Langmuir-Blodgett-Layers
,”
Langmuir
, Vol.
5
, pp.
485
489
.
13.
Novotny
V. J.
,
1990
, “
Migration of Liquid Polymers on Solid Surfaces
,”
Journal of Chemical Physics
, Vol.
92
, pp.
3189
3196
.
14.
Novotny
V. J.
, and
Baldwinson
M. A.
,
1991
, “
Lubricant Dynamics in Sliding and Flying
,”
Journal of Applied Physics
, Vol.
70
, pp.
5647
5652
.
15.
Paciorek
K. J. L.
,
Kratzer
R. H.
,
Kaufman
J.
, and
Nakahara
J. H.
,
1979
, “
Thermal Oxidative Studies of Poly(hexafluoropropene Oxide) Fluids
,”
Journal of Applied Polymer Science
, Vol.
24
, pp.
1397
1411
.
16.
Ru¨he, J., Kuan, S., Novotny, V. J., Blackmann, G., Clarke, T., and Street, G. B., 1991, “Ultrathin Perfluoropolyether Films,” ACS Symposium Series, Vol. 485, pp. 156–168.
17.
Ru¨he
J.
,
Novotny
V. J.
,
Kanazawa
K. K.
,
Clarke
T.
, and
Street
G. B.
,
1993
a, “
Structure and Tribological Properties of Ultrathin Alkylsilane Films Chemisorbed to Solid Surfaces
,”
Langmuir
, Vol.
9
, p.
2383
2383
.
18.
Ru¨he
J.
,
Kuan
S.
,
Novotny
V. J.
,
Blackmann
G.
,
Clarke
T.
, and
Street
G. B.
,
1993
b, “
Terminal Attachment of Perfluorinated Polymers to Solid Surfaces
,”
Journal of Applied Polymer Science
, Vol.
53
, pp.
825
836
.
19.
Seto
J. T.
,
Nagai
Ishimoto C.
, and
Watanabe
H.
,
1985
, “
Frictional Properties of Magnetic Media Coated with Langmuir-Blodgett Films
,”
Thin Solid Films
, Vol.
134
, p.
101
101
.
20.
Sianesi
D.
,
Zamboni
V.
,
Fontanelli
R.
,
Buraghi
M.
,
1971
, “
Perfluoropolyethers: Their Physical Properties and Behavior at High and Low Temperatures
,”
Wear
, Vol.
18
, pp.
85
100
.
21.
Sianesi, D., Fontanelli, R., 1972, US Patent No. 3,665,041.
22.
Sianesi
D.
,
Pasetti
A.
,
Fontanelli
R.
,
Bernardi
G. C.
, and
Caproiccio
G.
,
1973
, “
Perfluoroethers by Photooxidation of Fluoroolefins
,”
Chimica e L’ Industria
, Vol.
55
, pp.
208
221
.
23.
Zehe, M. J., and Faut, O. D., 1989, “Acidic Attack of Perfluorinated Alkyl Ether Lubricant Molecules by Metal Oxide Surfaces,” NASA Technical Memorandum 101962, pp. 1–17.
This content is only available via PDF.
You do not currently have access to this content.