Some Mechanical Properties of Impregnated Bark Board

Some of the compressive and flexural properties of bark-board and polymer impregnated barkboard have been investigated. The barkboard was comprised of hammermilled red oak bark and (6%) phenolic resin. Two different polymer systems were used for impregnation. One was methyl methacrylate-trimethylol propane trimethacrylate – azo(MMA-TMPTMA-AZO) and the other was diglycidyl ether of biphenol A-stryrene oxide-diethyl amino proplylamine (epoxy). The maximum crushing strength is about 4 and 8 times greater for MMA and epoxy impregnated barkboard respectively as compared to the controls. The modulus of rupture is about 2 and 5 times greater for the MMA and epoxy impregnated barkboard respectively as compared to the controls. Similar increases in the compressive modulus and flexural modulus values for the MMA impregnated (factor of about 2 times) and epoxy impregnated (factor of about 5 times) barkboard as compared to the controls were observed. Regression analysis revealed the different relationships between the strength properties, densities and percent mass loading. The regression relationships established for the mechanical properties and other measured parameters of the control specimens were not necessarily significant for the same measured parameters of the impregnated specimens.

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