o 



T5 

 C 



o 



X 

 LU 



n 



TG A 



\ 



T \ \ 



i.o °c V 



\ 



Ill \J 



i 



100 



80 



60 



- 40 



20 



50 



100 



200 300 

 Temperature (°C.) 



400 



o 

 c 



? 

 o 



TG A 



A DTA ~ 











10° c. \\ 





w 





I lil ili 



^ 



1 i 



- 100 



_ 80 



60 



40 



20 



50 



100 



200 300 

 Temperature (° C.) 



400 



Figure 5. — Thermograms of cellulose (II) and cellulose treated with 5 percent zinc chloride. 



The changes caused by NaOH are dissimilar to those caused by ZnCl 2 . The TGA shows 

 the rate of weight loss to be slower for alkali treatment and the residue to be greater 

 (fig. 6). On DTA an apparent exotherm, beginning at 175° C, occurred, which was followed 

 by a much reduced endotherm as compared to untreated cellulose. A large exotherm 

 occurs from 275° to 350° C. and is the major difference between the two treatments. 

 This is in agreement with the results of Mack and Donaldson (1967) for base treated 

 cellulose. Table 3 lists the thermal properties of treated and untreated cellulose. 



10 



