| Abstrakt: |
The profiles, mechanical performance, and structure of the hybrid coatings cured at three cure windows (25 ± 2 °C, 3 h; 120 °C, 1 h, and 250 °C, 1 h) were investigated in this paper. Why SiO2/resole hybrid coatings at 250 °C, 1 h have excellent mechanical performance is revealed, suggesting a new way for preparing other inorganic/organic hybrid coatings. The influences of elevating curing temperature on the film performance are mainly determined by two factors: more cross-linking reactions and breaks of Si-O-Si bonds. The break and rearrangement of Si-O-Si bonds relieve the brittleness caused by more crosslinking so that SiO2/resole hybrid coatings cured at 250 °C, 1 h still exhibit excellent adhesion and mar resistance. The color change of the coatings cured at 250 °C, 1 h is ascribed to the presence of FTIR band at 1658 cm−1, suggesting part of methylene groups between phenolic rings being transformed into aceto groups by oxidation. Owning to the presence of the excellent high-temperature adhesion, the hybrid coatings used as primers can meet the temperature demand for curing any organic coatings applied on them. [ABSTRACT FROM AUTHOR] |
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