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- Title
Effect of the Solvent Type on the Colloidal Stability and the Degree of Condensation of Silica Sols Stabilized by Amphiphilic Urethane Acrylate and the Properties of Their Coating Films.
- Authors
Le, Hong Nhung; Lee, Choonho; Jung, Woochul; Kim, Juyoung
- Abstract
The colloidal stability of silica O-I hybrid sols that have a high degree of condensation could result in the formation of a hard coating film on a substrate, which could depend on the properties of solvents used in the sol-gel reaction. In this study, the effect of the solvent type on the colloidal stability and degree of condensation of the silica sols was investigated by preparing various silica O-I hybrid sols using different solvent mixtures composed of various aprotic and protic solvents in the presence of amphiphilic urethane acrylate. Silica sols prepared using the appropriate aprotic-protic solvent mixture showed a higher degree of condensation and long-term colloidal stability, which was confirmed using 29Si-NMR and DLS. Furthermore, the coating film formed from these silica sols showed a remarkable hardness of 0.97 GPa, with a thickness of 4.76 µm confirmed using nanoindentation measurements.
- Subjects
COLLOIDAL stability; COLLOIDS; PROTOGENIC solvents; URETHANE; APROTIC solvents; ACRYLATES; SILICA gel; SILICA films
- Publication
Coatings (2079-6412), 2023, Vol 13, Issue 12, p1997
- ISSN
2079-6412
- Publication type
Article
- DOI
10.3390/coatings13121997