Title: On the importance of hydroquinone/p-quinone redox system in the photoyellowing of mechanical pulps
Author: Agarwal, Umesh P.
Source: [10th International Symposium on Wood and Pulping Chemistry, Main Symposium, 1999 June 07-10, Yokohama, Japan]. Atlanta, GA : TAPPI Press, 1999.:p. 694-697 : ill.
Publication Series: Not categorized
Description: In the area of photoyellowing of mechanical pulps, recently obtained experimental evidence has shown that hydroquinone/p-quinone redox couple is present in lignin-rich mechanical pulps. It was also noted that compared to a control pulp the concentration of p-quinones was significantly higher in a photoyellowed pulp. Under ambient conditions, upon exposure to light, the existent pulp hydroquinones were converted to p-quinones. To further investigate the importance of hydroquinone/p-quinone redox couple in photoyellowing, studies of methylhydroquinone and methyl-p-quinone were carried out. Based on presently reported as well as previously published research, it is shown that the hydroquinone/p-quinone redox system can successfully explain most of the observations related to photoyellowing. Consequently, the hydroquinone/ p-quinone redox couple plays a highly significant role in pulp photoyellowing.
Keywords: Hydroquinone, Benzoquinone, Mechanical pulping, Redox reactions, Photoyellowing, Yellowing
- We recommend that you also print this page and attach it to the printout of the article, to retain the full citation information.
- This article was written and prepared by U.S. Government employees on official time, and is therefore in the public domain.
XML: View XML
Agarwal, Umesh P. 1999. On the importance of hydroquinone/p-quinone redox system in the photoyellowing of mechanical pulps. [10th International Symposium on Wood and Pulping Chemistry, Main Symposium, 1999 June 07-10, Yokohama, Japan]. Atlanta, GA : TAPPI Press, 1999.:p. 694-697 : ill.
Get the latest version of the Adobe Acrobat reader or Acrobat Reader for Windows with Search and Accessibility