Type of Document	Master's Thesis
Author	Malmberg, Michael J
Author's Email Address	malmbergmj@bordenchem.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	isocyanate NMR Fracture Mechanics Wood Adhesion FTIR
Date of Defense	2000-12-05
Availability	unrestricted
Abstract Species Dependence of pMDI/Wood Adhesion by Michael J. Malmberg Wood Science and Forest Products ABSTRACT 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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