Rf-o2 plasma surface modification of kraft lignin derived from wood pulping

ŞAHİN H. T.

Wood Research, vol.54, no.1, pp.103-112, 2009 (SCI-Expanded, Scopus) identifier

  • Publication Type: Article / Article
  • Volume: 54 Issue: 1
  • Publication Date: 2009
  • Journal Name: Wood Research
  • Journal Indexes: Science Citation Index Expanded (SCI-EXPANDED), Scopus
  • Page Numbers: pp.103-112
  • Keywords: Cold plasma, Funtionalities, Kraft lignin, Oxidation, Surface modification, XPS
  • Isparta University of Applied Sciences Affiliated: No

Abstract

The RF O2-plasma treatments show significant changes in the nature and relative ratio of surface atoms in kraft lignin compounds. The comparisons between the treatments and the measured results reveal that the oxidation response of a kraft lignin can be predicted quite well by changing the external plasma parameters. The XPS measurements show that low power and prolonged reaction time are sufficient, to significantly alter the chemical structure of lignin. The nonequivalent, High Resolution (HR), C1s XPS analyses reveals the diversity of oxygen- based functionalities. Besides the characteristic lignin functionalities, the existence of a newly formed -COO group can be noted. It has been suggested that the increase of-COO concentration is related to the diminution of C-C and C=C, C-O-C and C-OH, and O-C-O groups on the lignin structure.