SEM and shrinkage analyses of Southern Pine wood following pyrolysis


Samples of Southern Pine (Pinus spp.) charred to 250°, 300°, 350°, 400° or 600°C in a flowing nitrogen atmosphere at rates of 1°, 10° and 50°C/min were examined using the scanning electron microscope to quantify changes in cross-sectional tracheid dimensions. The disappearance of discrete cell wall layers was time-dependent as opposed to strictly temperature-dependent. Tracheid diameters decreased in response to temperature and charring rate. Double cell wall thickness values also decreased in response to charring. This shrinkage was nearly isotropic. Below 300°C, latewood cells were more stable than earlywood cells. Above 300°C, the reverse was true. This was attributed to the probable circumferential arrangement of cellulose, hemicellulose, and lignin within the cell wall. The highest rate of thermal degradation was between 300° and 350°C.

DOI: 10.1007/BF00584041

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@article{Cutter2004SEMAS, title={SEM and shrinkage analyses of Southern Pine wood following pyrolysis}, author={B. E. Cutter and B. G. Cumbie and Erika McGinnes}, journal={Wood Science and Technology}, year={2004}, volume={14}, pages={115-130} }