Characterizing Liquid Resin Penetration In Wood Using A Mercury Intrusion Porosimeter
Keywords:Mercury intrusion porosimeter (MIP), pore structure, pore volume change, resin penetration, curing condition
AbstractA method has been developed to characterize resin penetration by measuring the change in the pore size distribution and porosity of samples with and without resin using a mercury intrusion porosimeter. The method was used to study the liquid phenol-formaldehyde resin penetration in birch and aspen veneer samples as a function of different curing conditions. For both the birch and aspen samples, the liquid PF resin was found to penetrate mostly into the bigger pores (diameter ≥ 40 μm for birch/LPF and diameter ≥ 10 μm for aspen/LPF) for specimens cured in the oven. Resin penetrated into the smaller pores under the influence of pressure when cured in a hot-press, especially when the specimens were cured at face location in the hot-press. Under all curing conditions, some resin only partially filled some pores and resulted in an increase in pores of smaller sizes.
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