Surface analysis by ESCA of sulfite post-treated CTMP

✍ Scribed by A. O. Barry; Z. Koran; S. Kaliaguine

• Publisher: John Wiley and Sons
• Year: 1990
• Tongue: English
• Weight: 628 KB
• Volume: 39
• Category: Article
• ISSN: 0021-8995
• DOI: 10.1002/app.1990.070390103

✦ Synopsis

Handsheets of post-treated chemithermomechanical pulps (CTMP) and a sample of Whatman paper no. 1 were analyzed using an ESCA spectrometer. All of these samples revealed the presence of the C,, C,, and C, components in the carbon (1s) peak and the 0, component in the oxygen (1s) peak; the 0, peak component which was present in the other samples was missing from the Whatman paper. Pulp sulfonation produced a reduction in C, representing the group of carbon not bonded to oxygen, and an increase in C, with C, remaining relatively constant. These changes imply reductions in lignin and extractives and a corresponding increase in cellulose content on the fiber surface. Extrapolation of the C,, C,, C,/C,, and O/C curves of CTMP to zero percent sulfonation yielded the same values as those obtained for pure TMP. ESCA analysis allows us to monitor the increase of sulfur content as a function of sulfonation in accordance with results obtained from bulk pulp sulfonate content titration.