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Original Research

The effect of composition and thermodynamics on the surface morphology of durable superhydrophobic polymer coatings

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Pages 53-68 | Published online: 15 Feb 2017

Figures & data

Table 1 Physical properties of the binders

Table 2 Interfacial tensions calculated using Antonoff and Girifalco and Good methods for binders and dispersed NPs

Table 3 Spreading coefficients for neat and diluted binders with dispersed NPs in IPA

Table 4 Spreading coefficient for neat binders and solid NPs

Figure 1 SEM of surface morphology with increasing ECA wt% on two different substrates.

Notes: (AE) 5, 10, 15, 20, and 25 ECA wt% on glass; (FJ) 5, 10, 15, 20, and 25 ECA wt% on the PC substrate. Scale bar is 5 μm.
Abbreviations: ECA, ethyl cyanoacrylate; PC, polycarbonate; SEM, scanning electron microscopy; SH, superhydrophobic.
Figure 1 SEM of surface morphology with increasing ECA wt% on two different substrates.

Figure 2 Scanning electron microscopy of surface morphology with increasing epoxy wt% on two different substrates.

Notes: (AE) 5, 10, 15, 20, and 25 epoxy wt% on glass; (FJ) 5, 10, 15, 20, and 25 epoxy wt% on the PC substrate. Scale bar is 5 μm.
Abbreviations: PC, polycarbonate; SH, superhydrophobic.
Figure 2 Scanning electron microscopy of surface morphology with increasing epoxy wt% on two different substrates.

Figure 3 SEM of surface morphology with increasing UA wt% on two different substrates.

Note: (AE) 5, 10, 15, 20, and 25 UA wt% on glass; (FJ) 5, 10, 15, 20, and 25 UA wt% on the PC substrate. Scale bar is 5 μm.
Abbreviations: PC, polycarbonate; SEM, scanning electron microscopy; UA, urethane acrylate; SH, superhydrophobic.
Figure 3 SEM of surface morphology with increasing UA wt% on two different substrates.

Table 5 Surface free energy calculation for PC based on Zisman and LW/AB methods

Table 6 Interfacial tension for acetone solvent and uncured binders with glass

Table 7 Interfacial tension for acetone solvent and uncured binders with PC

Figure 4 Wetting characteristics on glass using contact angle and sliding angle measurements for three different binder formulations as a function of increasing wt% binder.

Abbreviations: ECA, ethyl cyanoacrylate; UA, urethane acrylate.
Figure 4 Wetting characteristics on glass using contact angle and sliding angle measurements for three different binder formulations as a function of increasing wt% binder.

Figure 5 Wetting characteristics on PC using contact angle and sliding angle measurements for three different binder formulations as a function of increasing wt% binder.

Abbreviations: ECA, ethyl cyanoacrylate; PC, polycarbonate; UA, urethane acrylate.
Figure 5 Wetting characteristics on PC using contact angle and sliding angle measurements for three different binder formulations as a function of increasing wt% binder.

Figure 6 XPS of silica, binders on glass and PC.

Notes: (A) XPS survey scanning of the surface composition of dry, as-supplied silica NPs and with the presence of FAS; (B) XPS survey scanning of all 5 wt% binder formulations on glass; and (C) XPS survey scanning of all 5 wt% binder formulations on PC. The red circle indicates position of fluorine peak.

Abbreviations: ECA, ethyl cyanoacrylate; NPs, nanoparticles; PC, polycarbonate; UA, urethane acrylate; XPS, X-ray photoelectron spectroscopy; FAS, fluoroalkylsilane.

Figure 6 XPS of silica, binders on glass and PC.Notes: (A) XPS survey scanning of the surface composition of dry, as-supplied silica NPs and with the presence of FAS; (B) XPS survey scanning of all 5 wt% binder formulations on glass; and (C) XPS survey scanning of all 5 wt% binder formulations on PC. The red circle indicates position of fluorine peak.Abbreviations: ECA, ethyl cyanoacrylate; NPs, nanoparticles; PC, polycarbonate; UA, urethane acrylate; XPS, X-ray photoelectron spectroscopy; FAS, fluoroalkylsilane.

Table 8 SFE calculation for neat cured binders and PC based on Zisman and LW/AB methods

Table 9 SFE values for all binder formulations on glass and PC using Zisman’s method

Figure 7 Wetting characteristics after the tape test on glass using contact angle and sliding angle measurements for three different binder formulations with increasing binder wt%.

Abbreviations: ECA, ethyl cyanoacrylate; UA, urethane acrylate.
Figure 7 Wetting characteristics after the tape test on glass using contact angle and sliding angle measurements for three different binder formulations with increasing binder wt%.

Figure 8 Wetting characteristics after the tape test on PC using contact angle and sliding angle measurements for three different binder formulations with increasing binder wt%.

Abbreviations: ECA, ethyl cyanoacrylate; PC, polycarbonate; UA, urethane acrylate.
Figure 8 Wetting characteristics after the tape test on PC using contact angle and sliding angle measurements for three different binder formulations with increasing binder wt%.

Figure S1 Surface tension results for neat and diluted uncured binders using pendant drop method.

Abbreviations: ECA, ethyl cyanoacrylate; UA, urethane acrylate.

Figure S1 Surface tension results for neat and diluted uncured binders using pendant drop method.Abbreviations: ECA, ethyl cyanoacrylate; UA, urethane acrylate.

Figure S2 Zisman linear regression plot to find the critical surface free energy for ECA formulations (A) on glass (B) on PC.

Abbreviations: ECA, ethyl cyanoacrylate; PC, polycarbonate.

Figure S2 Zisman linear regression plot to find the critical surface free energy for ECA formulations (A) on glass (B) on PC.Abbreviations: ECA, ethyl cyanoacrylate; PC, polycarbonate.

Figure S3 Zisman linear regression plot to find the critical surface free energy for epoxy formulations (A) on glass (B) on PC.

Abbreviation: PC, polycarbonate.

Figure S3 Zisman linear regression plot to find the critical surface free energy for epoxy formulations (A) on glass (B) on PC.Abbreviation: PC, polycarbonate.

Figure S4 Zisman linear regression plot to find the critical surface free energy for UA formulations (A) on glass and (B) on PC.

Abbreviations: PC, polycarbonate; UA, urethane acrylate.

Figure S4 Zisman linear regression plot to find the critical surface free energy for UA formulations (A) on glass and (B) on PC.Abbreviations: PC, polycarbonate; UA, urethane acrylate.

Table S1 Surface tension calculation for neat and diluted binders