An investigation on the transition characteristics of the wood cell walls during carbonization

초록

The structural changes of the cell wall and crystalline cellulose of Quercus variabilis wood in a pyrolysis system at several temperatures ranging from 250 to 500A degrees C were investigated to examine the wood carbonization characteristics. The volume of the wood sample was decreased and the weight loss was increased by increasing the carbonization temperature. Vessels collapsed severely in tangential direction during the charring process above 350A degrees C. SEM observation indicated that the layering structure of the walls in wood fibers and parenchyma cells were retained below 300A degrees C. However, the cell walls above 350A degrees C changed to an amorphous-like structure without cell wall layering. X-ray diffraction confirmed that the cellulose crystalline substance was still remained at the carbonization temperature of 300A degrees C but was not detected above 350A degrees C. It can be concluded that the transition from Q. variabilis wood to charcoal might occur at approximately 350A degrees C.

키워드