Title page for ETD etd-10202003-134743


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.

Files
  Filename       Size       Approximate Download Time (Hours:Minutes:Seconds) 
 
 28.8 Modem   56K Modem   ISDN (64 Kb)   ISDN (128 Kb)   Higher-speed Access 
  final5.pdf 736.88 Kb 00:03:24 00:01:45 00:01:32 00:00:46 00:00:03

Browse All Available ETDs by ( Author | Department )

dla home
etds imagebase journals news ereserve special collections
virgnia tech home contact dla university libraries

If you have questions or technical problems, please Contact DLA.