By Chan Bao Cheng
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Extra resources for Formaldehyde: Chemistry, Applications and Role in Polymerization
0. *Reproduced from ref.  with by permission from John Wiley & Sons (© John Wiley & Sons, 2011). 3. , the outer and fracture surfaces. Prior to looking at the microstructure at the outer surface of the cured UF resin films, comparison was made between the AFM image of the UF resin films prepared by adding without and with NH4Cl as shown in Figure 27. , bright and dark areas (Figure 27, a). 2 . Lower F/U mole ratio UF resin has colloid particles, which are coalesced into clusters in the aging process.
After 10 seconds of etching, the surface roughness had not much changed even though the hard phase area increased. But, the surface roughness increased with 20 seconds, which was consistent with the measurements of the hard phase area as shown in Figure 29 (b). These results also suggest that the hydrolysis simulated by acid etching removes the soft phase first and then hard phase. 1% NH4Cl. The AFM image is shown in Figure 30, (a). As expected, the AFM image also showed the hard and soft phases.
Thus, this temperature was presented as the gel temperature. Similar definition of the gel time was reported for an isothermal scanning of melamine-modified UF resins . Properties of Urea-Formaldehyde Resins for Wood-Based Composites 23 An increase of the E after the minimum was possibly ascribed to the change of network structure of UF resin adhesive from gel state to glassy state where the number of cross-linking increased as it went through curing process. A decrease of the E after the maximum could be due to combined effects of many factors.