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Fractal polyzirconosiloxane cluster coatings

Authors
Journal
Thin Solid Films
0040-6090
Publisher
Elsevier
Publication Date
Volume
216
Issue
2
Identifiers
DOI: 10.1016/0040-6090(92)90846-4
Disciplines
  • Mathematics

Abstract

Abstract Fractal polyzirconosiloxane (PZS) cluster films were prepared through the hdrolysis-polycondensation-pyrolysis synthesis of two-step HCI acid-NaOH base catalyzed sol precursors consisting of N[3-(triethoxysilyl)propyl]-4,5-dihydroimidazole, Zr(OC 3H 7) 4, methanol, and water. When amorphous PZSs were applied to aluminum as protective coatings against NaCl-induced corrosion, the effective film was that derived from the sol having a pH of 8.6. The following four factors played an important role in assembling the PZS coating films: (1) a proper rate of condensation, (2) a moderate ratio of SiOSi to SiOZr linkages formed in the PZS network, (3) hydrophobic characteristics, and (4) a specific microstructural geometry, in which large fractal clusters were linked together.

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