Characterization of acidic groups in oxycelluloses IV. Effect of accelerated aging on yellowing as well as carboxyl groups and lactones in pulp

✍ Scribed by W. B. Achwal; Radha Murali

• Publisher: John Wiley and Sons
• Year: 1986
• Tongue: English
• Weight: 226 KB
• Volume: 32
• Category: Article
• ISSN: 0021-8995
• DOI: 10.1002/app.1986.070320310

✦ Synopsis

Bleached bamboo pulp as well as two oxypulps were subjected to accelerated aging by heating as well as steaming, and the yellowing or color reversion was studied. The yellowing is increased by the presence of free carboxyl and the reducing groups in oxycelluloses. The aging treatments were found to cause an increase in free carboxyl groups accompanied by a reduction in copper number. A differentiation between free carboxyl and various lactone groups in oxidized and also aged samples was carried out based on the variation in their reaction rates with KIIKIO, solution, and the characteristic acidic group spectrum showed that on steam aging the fastreacting lactones are lost.