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Micro-morphological Features of Liquid Urea-Formaldehyde Resins during Curing Process at Different Levels of Hardener and Curing Time Assessed by Transmission Electron Microscopy

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Figure 1. TEM micrographs of liquid UF resin with different F/U mole ratios: (a) 1.6 F/U mole ratio, and (b) 1.0 F/U mole ratio
Figure 3f shows the development of extensive coalescence of the spherical particles in the low F/U mole ratio UF resins when increasing the amount of hardener and curing time

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