CHEMICALLY DENSIFIED WOOD:-
More recent studies have combined chemical process with traditional mechanical hot press methods to increase density and thus mechanical properties of the wood. In these methods, chemical processes break down lignin and hemicellulose that is found naturally in wood. Following dissolution, the cellulose strands that remain are mechanically hot compressed. Compared to the three-fold increase in strength observed from hot pressing alone, chemically processed wood has been shown to yield an 11-fold improvement. This extra strength comes from hydrogen bonds formed between the aligned cellulose nanofibers.
The densified wood possessed mechanical strength properties on par with steel used in building construction, opening the door for applications of densified wood in situations where regular strength wood would fail. Environmentally, wood requires significantly less carbon dioxide to produce than steel and acts as a source for carbon sequestration.
REFERENCE TAKEN FROM WIKIPEDIA