Wood Chemistry Flashcards
A broad interdisciplinary field focusing on the chemical and biochemical aspects of trees and products such as pulp and paper.
Wood Chemistry
What are the element compositions of wood?
Element
Carbon
Hydrogen
Oxygen
Nitrogen
Ash
What is the principle element of wood?
Carbon 49%
What are the major components of a woody plant cell wall?
Cellulose
Hemicellulose
Lignin
What are the primary chemical components?
Holocellulose 60-70%
Cellulose 40-60%
Hemicellulose 20-50%
Lignin 15-35%
What are the secondary chemical components?
Tannins
Volatile Oils
Gums
Ash
Matrix substance of the cell wall composed of 2 types of sugar molecule (xylan and glucomannans)
Hemicellulose
Made of intractable material which acts as the cementing substance of wood
Lignin
The polysaccharide fraction of the woody elements
Holocellulose
Long chain of glucose units that polymerize into microfibrils
Cellulose
The process of preserving or inceasing the life of wood either chemically/ mechanically
Wood preservation
Objectives of wood preservation
Increase durability and service life
Increase natural resistance to decay
Stabilize the wood to environmental changes
Improve surface for mechanical wear
This are chemicals applied to wood to make it more resistant to attacks of agencies of wood deterioration
Wood preservatives
What are the requirement of a good preservatives?
Permanent
Penetrate
Safe handle and use
Harmless to wood and metal
Plentiful and available
Economical
What are the types of wood preservatives?
Water-borne Preservative
Oil-borne Preservative
