Hydrogen Bonding Effect on Wettability of Polysiloxane Coatings
The effect of thermal treatment on surface wettability of polysiloxane coatings was fully studied. In contrary to the enhanced hydrophobicity of methyltrimethoxysilane (MTMS)-based coatings, the water contact angle of tetraethoxysilane (TEOS)-based coatings decreased from 70.8 to 52.8° when temperature increased from 100 to 300 °C. It was confirmed by FT-IR, solid state 29Si NMR, and X-ray photoelectron spectroscopy measurements that compared with MTMS-based coatings, that TEOS-based coatings consisted of more silanol groups, most of which were in the form of intramolecular hydrogen bonds. The further condensation at higher temperature led to a rupture of these intramolecular hydrogen bonds, resulting in high surface free energy and thus hydrophilic surface. Besides, this hydrogen bonding effect on wettability was weakened as the content of MTMS went up in MTMS/TEOS hybrid coatings.
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