Studies of Wear and Tear and Hydrogen Bonding in Dendrimeric ...
Studies of Wear and Tear and Hydrogen Bonding in Dendrimeric Fluorinated Polysilsequioxanes Coatings on an Aluminum Surface Atul Tiwari1,2, Tomasz W Liskiewicz3, Lloyd Hihara2 1-
Pantheon Chemical Inc., Phoenix, 85027, AZ, USA.
2
-Department of Mechanical Engineering, University of Hawaii at Manoa, Honolulu, 96822, USA. 3
- School of Mechanical Engineering, University of Leeds, Leeds LS2 9JT, UK.
Corresponding Author: Dr. Atul Tiwari; email: [email protected]
Supporting Figures and Tables
Figure S1: Load Vs displacement curve displaying loading and unloading cycle after 48 h of hardening. No inconsistency was observed in the loading cycle.
Figure S2: Load Vs displacement curve displaying loading and unloading cycle after 96 h of hardening. No inconsistency was observed in the loading cycle.
Figure S3: Load Vs displacement curve displaying loading and unloading cycle after 144 h of hardening. No inconsistency was observed in the loading cycle.
Figure S4: Load Vs displacement curve displaying loading and unloading cycle after 192 h of hardening. There was slight deflection in the loading cycle suggesting that coating cracked or surface chipped off on application of high load. Such a data can be utilized for the calculation of fracture energy in coatings.
Figure S5: Load Vs displacement curve displaying loading and unloading cycle after inf h of hardening. No inconsistency was observed in the loading cycle. The loading and unloading curves were close to each other suggesting negligible plastic deformation and high elasticity in the material.
Figure S6: The SEM image of the impression after nanoindentation test. A crack developed on the coating after indenter head was withdrawn off the surface.
Figure S7: The SEM image of the scratch showing the cracking and delamintation in the coating over metal surface. The estimated thickness of the coating was 1.52 µm.
Figure S8: The SEM image of wear analysis on PSSQ. The removal of different layers in coating can be seen along with the cracks on the surface. Table S1: Various parameters derived from the analysis on PSSQ as a function of time Samples Nanomechanical Parameters Surface Parameters (nm) CL (mN)
COF
NCF
Sa
Sq
Sv
Sp
PSSQ2 10.9 0.47 1.70 2.10 7.00 7.10 PSSQ4 13.0 0.34 5 0.35 0.76 2.50 6.90 17.0 0.35 7 0.24 0.31 1.63 2.94 PSSQ6 PSSQ8 17.1 0.23 9 0.26 0.40 1.10 3.20 PSSQ∞ 30.0 0.34 10 0.56 0.71 3.80 4.40 CL = critical load; COF = coefficient of friction; NCF = number of wear cycles to failure; Sa = average surface roughness ; Sq = root mean square roughness; Sv = maximum depth of valley; Sp = maximum peak height
Pantheon Chemical Inc., Phoenix, 85027, AZ, USA.
2
-Department of Mechanical Engineering, University of Hawaii at Manoa, Honolulu, 96822, USA. 3
- School of Mechanical Engineering, University of Leeds, Leeds LS2 9JT, UK.
Corresponding Author: Dr. Atul Tiwari; email: [email protected]
Supporting Figures and Tables
Figure S1: Load Vs displacement curve displaying loading and unloading cycle after 48 h of hardening. No inconsistency was observed in the loading cycle.
Figure S2: Load Vs displacement curve displaying loading and unloading cycle after 96 h of hardening. No inconsistency was observed in the loading cycle.
Figure S3: Load Vs displacement curve displaying loading and unloading cycle after 144 h of hardening. No inconsistency was observed in the loading cycle.
Figure S4: Load Vs displacement curve displaying loading and unloading cycle after 192 h of hardening. There was slight deflection in the loading cycle suggesting that coating cracked or surface chipped off on application of high load. Such a data can be utilized for the calculation of fracture energy in coatings.
Figure S5: Load Vs displacement curve displaying loading and unloading cycle after inf h of hardening. No inconsistency was observed in the loading cycle. The loading and unloading curves were close to each other suggesting negligible plastic deformation and high elasticity in the material.
Figure S6: The SEM image of the impression after nanoindentation test. A crack developed on the coating after indenter head was withdrawn off the surface.
Figure S7: The SEM image of the scratch showing the cracking and delamintation in the coating over metal surface. The estimated thickness of the coating was 1.52 µm.
Figure S8: The SEM image of wear analysis on PSSQ. The removal of different layers in coating can be seen along with the cracks on the surface. Table S1: Various parameters derived from the analysis on PSSQ as a function of time Samples Nanomechanical Parameters Surface Parameters (nm) CL (mN)
COF
NCF
Sa
Sq
Sv
Sp
PSSQ2 10.9 0.47 1.70 2.10 7.00 7.10 PSSQ4 13.0 0.34 5 0.35 0.76 2.50 6.90 17.0 0.35 7 0.24 0.31 1.63 2.94 PSSQ6 PSSQ8 17.1 0.23 9 0.26 0.40 1.10 3.20 PSSQ∞ 30.0 0.34 10 0.56 0.71 3.80 4.40 CL = critical load; COF = coefficient of friction; NCF = number of wear cycles to failure; Sa = average surface roughness ; Sq = root mean square roughness; Sv = maximum depth of valley; Sp = maximum peak height
