Page 132 - Handbook of Surface Improvement and Modification

8.1 Methods and mechanisms of surface cleaning 127

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Figure 8.7. H NMR spectra of (a) polymethylhydrosiloxane, (b) hybrid coating, and (c) Si MAS-NMR spec-
trum of hybrid coating. [Adapted, by permission, from Nagappan, S; Choi, M-C; Sung, G; Park, SS; Moorthy,
MS; Chu, S-W; Lee, W-K; Ha, C-S, Macromol. Res., 21, 6, 669-80, 2013.]
contact angle of the composite
coating with PVDF:SiO = 1:1 by
2
o
weight was 154 and a sliding
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angle <2. This composite had the
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best cleaning efficiency.
A pre-coated steel sheet for
household electrical appliances
needs to be highly formable and
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stain-resistant. Polyester/
melamine-formaldehyde resin
blend in solution was used for
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steel coating. The surface was
enriched with melamine formalde-
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hyde resin.
Stain-resistant cationic-dye-
able polyamide-6 was obtained by
Figure 8.8. Cross-section of a surface pore of polished porcelain modification with sodium salt of
tiles after sealing. [Adapted, by permission, from Akarsu, M;
Burunkay, E; Tunah, A; Selli, NT; Arpaç, E, Ceramics Intl., 40, 5-sulfoisophthalic acid and poly-
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6533-40, 2014.] ethylene glycol. The cationic dye
uptake and acid dye resistance rate
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were improved by the modification with sodium salt of 5-sulfoisophthalic acid. Incorpo-
ration of polyethylene glycol destroyed the regularity of molecular chain arrangement,
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created more amorphous regions, and changed the polyamide-6 from α-form to γ-form.
Organic-inorganic hybrids were synthesized using polymethylhydrosiloxane,
2,2,3,4,4,4-hexafluorobutylmethacrylate, and tetraethylorthosilicate with a platinum cata-
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lyst. The resulting hybrids formed transparent thin films on glass substrate. The hybrid
thin films had good transparency, hydrophobicity, and good mechanical and anti-stain
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properties. Figure 8.7 shows the structure and NMR spectra of hybrid coating.