APPLICATION OF FT-RAMAN SPECTROSCOPY TO STUDY CHANGES IN CELLULOSE I CRYSTALLINITY THROUGH THE DISSOLVING PULP PROCESS
Cellulose I crystallinity can be defined as the intensity fraction of the crystalline domains in lignocellulosic materials. Cellulose crystallinity can vary significantly de-pending on the origin of cellulose (hardwoods, softwoods);the type of pulping and bleaching processes applied etc. Cellulose crystallinity has an important effect on the physical, mechanical and chemical properties of cellulose. An increase in cellulose crystallinity positively affects dimensional stability and density but negatively affects chemical reactivity and swelling. The cellulose I crystallinities of a Pinus patula and four Eucalyptus pulp samples during dissolving pulp production were determined using Fourier Transform (FT) Raman spectroscopy and Cross Polarisation Magic Angle Spinning Nuclear Magnetic Resonance (CP/MAS 13C-NMR) Spectroscopy. The cellulose I crystallinity was taken as the intensity of the 1096 cm-1 Raman peak and the intensity of the 89 ppm line in the CP/MAS 13C-NMR spectrum. There was an increase in Raman and CP/MAS 13C-NMR cellulose I crystallinities during bleaching. When the Raman cellulose I crystallinities were plotted against the CP/MAS l3CNMR cellulose I crystallinities for the different clones and species, the plots showed a linear average correlation (co-efficient of determination R2= ca. 0.8S). It was concluded that FT Raman is a rapid and accurate alternate method to CP/MAS 13C-NMR spectroscopy for the determination of cellulose I crystallinity in pulp samples during dissolving pulp production.
cellulose I crystallinity FT-Raman spectroscopy NMR spectroscopy
Viren Chunilall Tamara Bush
Forestry and Forest Products Research Centre, NRE, CSIR, P.O. Box 17001, Congella, 4013, Durban, Sou Forestry and Forest Products Research Centre, NRE, CSIR, P.O. Box 17001, Congella, 4013, Durban, Sou
国际会议
16th International Symposium on Wood,Fiber and Pulping Chemistry(第十六届木材、纤维及制浆化学国际会议)
天津
英文
472-477
2011-06-08（万方平台首次上网日期，不代表论文的发表时间）