Chemical stopping hydrocellulose

In both the 60 and 80 C reactions, the fibrous hydrocellulose exhibited higher kpg values than the amorphous hydrocellulose (Table V). This appears to be due to the involvement of more molecules in crystalline domains of the fibrous substrate. The greater inhibition of chemical stopping by cellulose I than cellulose II domains may also have contributed to this effect by allowing more molecules in the fibrous hydrocellulose to peel to a point where the reducing endgroup would be inaccessible. 

Except for the later period of the 80°C reactions, the fibrous hydrocellulose exhibited a higher value of kpg (Table V) than k(-g (Table IV). Consequently the degradation of a majority of the molecules in the fibrous hydrocellulose was terminated by physical rather than chemical stopping processes. In contrast, chemical stopping was the dominant mechanism of stabilization in the amorphous hydrocellulose. 

The rate of chemical stopping increases with temperature relative to peeling in both fibrous and amorphous hydrocellulose. This observation is consistent with previous findings ( )>... 

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