The Effect of PVA Adsorption on Stress Development during Drying in PVA/Silica Suspension Coating
- Conference date: 3–8 August 2008
- Location: Monterey (California)
The effect of PVA adsorption on stress evolution during film formation of 5 wt% poly (vinyl alcohol) 10 wt% silica suspension was studied by in‐situ beam deflection method1. Since the adsorption of polymer mainly depends on pH and time, the amount of PVA adsorption and stress development during drying was measured under various mixing time(∼160 hrs) and pH level Microstructure of dried film was observed with scanning electron microscope and decomposition temperature of PVA in the film was measured with TGA in order to understand the role of adsorbed polymer in film. As the amount of adsorption increased gradually for 100 hrs and became constant at pH 9, final stress increased as well and discontinuity disappeared in the transition region in stress development curve. Pore and globular aggregation size in drying film diminished with growing adsorption. As the amount of adsorption of PVA increased with decreasing pH, the final stress increased with lowering pH till pH 3 but the stress decreased at pH 1.5. It is because of the degeneration of PVA under strong acidic condition, as confirmed by the decrease of decomposition temperature of PVA. It is clear that the stress development during drying and film structure can be controlled by adsorbing binder before drying.
- Thin film structure
- Polymer films
- Scanning electron microscopy
- Thermogravimetric analysis
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