DEPOLYMERISED CELLULOSIC MATERIAL WITH A LOW CRISTALLINE RATIO OBTAINED FROM CELLULOSE FIBRES AND METHOD OF PREPARATION

摘要

Depolymerised cellulose powder having substantially an amorphous structure which is obtained by letting cellulose fibres dissolve in concentrated hydrochloric acid of about40% and at a temperature of at least 38`C. A homogeneous acid hydrolysis is carried out under well controlled conditions in order to depolymerise the dissolved cellulose and is stopped when the cellulose has achieved a mean degree of polymerisation between 10 and 200. The depolymerised dissolved cellulose is then separated and processed in order to obtain the aforesaid powder of amorphous depolymerised cellulose.