Method of assessing the thermal stability of cellulose acetate
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1. Characterisation of the thermal stability of cellulose acetate merely from the yellowing intensity does not reflect the changes in the degree of polymerisation during heat treatment. Therefore, we cannot always assess the destructive processes occurring in the specimen from the degree of yellowing of cellulose acetate.
2. It is desirable to monitor production batches of cellulose acetate  not only from the change in colour during heat treatment, but also from the resistance to destruction, characterised by the viscosity.