A mechanism to improve durability of oriented strand composite

A mechanism to improve toughness of a commercial oriented strand board (OSB) phenol formaldehyde (PF) resin is presented in this study. Effect of adding maleic anhydride polyolefins (MAPO), namely maleic anhydride polypropylene (MAPP) and maleic anhydride polyethylene (MAPE), on the toughness of phenol formaldehyde (PF) resin is investigated. Differential scanning calorimetry (DSC) was used to determine curing parameters. Dynamic properties of resin blends were analyzed using dynamic mechanical analysis (DMA) and toughness of adhesive blends was evaluated using fracture analysis. Particle size analysis using SEM indicated an emulsified form of MAPP resulted in a better distribution resin blend than blends with MAPP particles. DSC results indicated that 2.5 minutes at 145 °C was adequate for nearly 98% curing of the resin blends. With addition of MAPP, a dynamic temperature ramp test conducted with DMA showed an improvement in the storage modulus (E′) or stiffness of the resin system during cure. Cured laminates were again dynamically ramped and damping property (tanδ) was examined at three discreet temperatures (35 °C, 40 °C and 45 °C). Examination of tanδ at these temperatures with blends of MAPP or MAPE showed improvement in damping property. Fracture energies (GIc and GIa) at 12% MC were increased with the addition of MAPP at lower proportions (1.5% and 3%), whereas, addition of MAPE showed a

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