Interfacial shear strength of wood-plastic composites Public Deposited

http://ir.library.oregonstate.edu/concern/graduate_thesis_or_dissertations/5d86p344s

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  • This study examined the relationship of interfacial shear strength (IFSS) and bending strength (MOR) of several different wood-plastic composites (WPC's). Plastics utilized were high-density polyethylene (HDPE) and polypropylene (PP). Pine and oak were used as the wood species. Compatibilizers used included maleicanhydride polyethylene (MAPE), polymeric methylene diphenyl diisocyanate (PMDI), KymeneTM, stearic acid, stearic anhydride, and maleic-anhydride polypropylene. A positive correlation between IFSS and MOR for the control, and HDPE/MAPEcontaining WPC' s was observed within a certain concentration region. No direct correlation was observed for the HDPE WPC formulations overall. The MOR and IFSS for PP WPC's did not show a good correlation overall. MOR versus IFSS for PP/pine control and PP/pine/MAPP-containing WPC's showed a strong positive linear correlation when the 4% MAPP formulation was removed, but, the increase in properties observed did not rise proportionally with MAPP dosage. PP/oak WPC's showed poor correlation between MOR and IFSS. Microscopic analysis of the WPC's was inconclusive due to obscuration of the polymer spherulites by the wood particles. The DSC showed an increase in enthalpy with an increase in IFSS for pine WPC's. DSC data was inconclusive for oak WPC's.
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