Abstract
Untreated and fire-retardant treated specimens of Douglas-fir were pyrolyzed up to 30 minutes at temperatures of 250°, 350° and 550° C. Various cell wall components viewed under the scanning electron microscope appeared to decompose at rates related to their chemical composition. No structural differences were noted between pyrolyzed specimens of untreated wood and wood treated with a mixture of zinc chloride and sodium dichromate. Cell walls of specimens treated with a mixture of urea, monammonium phosphate, and glucose exhibited thermoplastic behavior as a result of exposure to high temperatures.
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