The benzylated wood dissolved in tetrahydrofuran

the solution may be used as polyols to prepared the thermoset materials．Hydroxyl number of the lower solution of liquefied benzylated wood was studied to determine the effect of the liquefaction conditions on the degree of liquefaction of benzylated wood

and the upper solution of liquefied benzylated wood was studied with GC-MS. It is proved that it was the dense products in the lower solution of liquefied benzylated wood that can be used as polyols．In order to maintain the strength of the thermoset materials made from benzylated wood

the liquefaction time and the liquid ratio should be no more than 6 h and 6:1

respectively

and it was also elucidated that the mixture of HCl and H3PO4 is better than HCl or H3PO4 alone．