Type of Document Master's Thesis Author Malmberg, Michael J Author's Email Address email@example.com URN etd-10202003-134743 Title Species Dependence of pMDI/Wood Adhesion Degree Master of Science Department Wood Science and Forest Products Advisory Committee
Advisor Name Title Frazier, Charles E. Committee Chair Glasser, Wolfgang G. Committee Member Helm, Richard Frederick Committee Member Keywords
- Fracture Mechanics
- Wood Adhesion
Date of Defense 2000-12-05 Availability unrestricted AbstractSpecies Dependence of pMDI/Wood Adhesion
Michael J. Malmberg
Wood Science and Forest Products
Polymeric methylenebis(phenylisocyanate) (pMDI) has increasingly been used in the wood particulate composite industry. Wood composites, especially oriented strand board (OSB) are made with many variations of wood species. Little research has been done to investigate how pMDI adhesion has been affected by species.
The present is divided into two parts. First, mode I fracture mechanics and surface free energy analysis was performed to investigate differences in adhesion between southern yellow pine and yellow-poplar bonded with pMDI. Secondly, an improvement in the synthesis of 13C, 15N labeled pMDI is discussed.
Mode I fracture results show that pMDI adhesion was affected differently by southern yellow pine compared yellow poplar. The shear energy release rate was significantly higher in pine/pMDI composites than in yellow poplar/pMDI composites. The total surface energy of southern yellow pine was shown to be significantly greater than yellow poplar. The free energy of adhesion (DG) of the pine/pMDI and the poplar/pMDI was investigated. The DG indicated that the pine/pMDI system would take more energy to separate compared to the poplar/pMDI system. Lastly, a double-labeled 13C, 15N pMDI adhesive was successfully synthesized to produce Solid-State NMR composites.
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