Prepolymerization of Lacquer Sap under Pure Oxygen Atmosphere and Its Effects on the Properties of Lacquer Film

Figure 4

Micrographs (1000x magnification) of raw lacquer saps in different prepolymerization time. (a) 0 h; (b) 0.5 h; (c) 1.0 h; (d) 1.5 h; (e) 2.5 h; (f) 3.0 h.

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(b)

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(f)