Wood liquefaction was conducted using phenol as a reagent solvent with oxalic acid as a catalyst. A series of studies were done on liquefied wood, liquefied wood residues, novolac-type liquefied wood resins, and bio-composites fabricated from liquefied wood resin. The results of the liquefied wood residue characterization revealed that the liquefaction reactions conducted in different reaction vessels underwent different liquefaction mechanisms. The crystallinity indexes of the liquefied wood residues were higher than that of the original wood, indicating that the amorphous lignin was the most susceptible component in wood to the liquefaction reaction. Fe2+ and Fe3+ ions were found to have catalytic effects during liquefaction reaction. The cure kinetic study of two typical liquefied wood resins (LWR) showed that the activation energies of liquefied wood resin were higher than conventional phenolic resins and close to that of a lignin-phenol-formaldehyde resin from another study. It was found that LWR followed an autocatalytic cure mechanism. Two kinetic models were proposed for LWR based on the isothermal differential scanning calorimetry (DSC) methods. The flexural strengths of the composites were comparable to that of similar products reported by other researchers, indicating that the liquefied wood resin and liquefied wood residue from a weak-acid-catalyzed liquefaction could be successfully applied to molded bio-composite products as a substitute for conventional novolac resin.
| Identifer | oai:union.ndltd.org:LSU/oai:etd.lsu.edu:etd-07162007-132432 |
| Date | 23 July 2007 |
| Creators | Pan, Hui |
| Contributors | Steven Hall, Todd F Shupe, Chung-Yun Hse, Paul Russo, Richard Vlosky |
| Publisher | LSU |
| Source Sets | Louisiana State University |
| Language | English |
| Detected Language | English |
| Type | text |
| Format | application/pdf |
| Source | http://etd.lsu.edu/docs/available/etd-07162007-132432/ |
| Rights | unrestricted, I hereby certify that, if appropriate, I have obtained and attached herein a written permission statement from the owner(s) of each third party copyrighted matter to be included in my thesis, dissertation, or project report, allowing distribution as specified below. I certify that the version I submitted is the same as that approved by my advisory committee. I hereby grant to LSU or its agents the non-exclusive license to archive and make accessible, under the conditions specified below and in appropriate University policies, my thesis, dissertation, or project report in whole or in part in all forms of media, now or hereafter known. I retain all other ownership rights to the copyright of the thesis, dissertation or project report. I also retain the right to use in future works (such as articles or books) all or part of this thesis, dissertation, or project report. |
Page generated in 0.0054 seconds