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Dynamic mechanical analysis (DMA) of nano cupric oxide (CuO) modified aqueous phenol formaldehyde (PF) resin
2014 - IRG/WP 14-40654
Phenol formaldehyde (PF) resins, modified by nano CuO incorporating alkane surfactant and polyvinyl alcohol (PVA) 17-99, were analyzed by dynamic mechanical analysis (DMA). The mechanical properties of its bonded plywood including tensile strength, modulus of rupture (MOR), modulus of elasticity (MOE) and shear strength under five test conditions were evaluated. Results indicated that the incorporation of nano CuO and PVA 17-99 separated the gel point and vitrification point delaying of moisture loss in modified PF resin during the curing process. The modification caused adverse effect on tensile strength but only minimal influence on MOR and MOE. Additionally, PVA 17-99 reduced the water resistance of cure PF resins. However, under the special test conditions, PVA consolidated the re-curing effect and compensated for the strength loss by hydrolysis.
Wei Gao, Guanben Du