ABSTRACT
Investigations have been carried out to determine the glass transition temperatures of lignin, hemicelluloses and semi-crystalline cellulose by for instance goring (1963), Baldwin and goring (1968), takamura (1968), Back and didriksson (1969), Hatakeyama et al. (1972), Alfthan et al. (1973), salmén (1979), Back and salmén (1982) and lapierre and Monties (1986). Baldwin and goring (1968) have shown that the Tg values of the isolated components of wood differ from those in native wood. Back and salmén (1982) studied the relationship between the glass transition temperatures of lignin, hemicelluloses and semi-crystalline cellulose and their moisture contents. It is often difficult to determine the Tg of wood components and the results differ, according to Irvine (1984), the results differ for several reasons:
• the chemically extracted components of wood may be degraded chemically during isolation or separation.
