NOVEL INVESTIGATIONS ON CELLULOSE HETEROGENEOUS CARBANILATION USING SEC/RI/LS/VISCOMETRY
Heterogeneous tricarbanilation of cellulose from purified cotton linters and from wood pulps was assessed using different derivatization protocols including DMSO and pyridine as solvents. The coupling of detectors (refractometry, viscometry and light scattering) combined to the observation of the size exclusion chromatographic behaviour of the column allowed to get information about molecular size and conformation of the cellulose tricarbanilates (CTCs) which depended on the derivatization protocol and solvent used. On model celluloses, derivatization in DMSO did not produce CTCs with same molecular conformation as derivatization in pyridine. Slight cellulose degradation was observed in DMSO; however, pyridine was in general less efficient as carbanilation solvent and in some cases promoted molecular aggregation in THF, which effects the molecular weight distribution measurement. Crossing the information of RI, LS and viscometric detection provides an absolute quantification of molar mass and hydrodynamic radius. This methodology was applied to assess the modifications produced on a hardwood pulp submitted to various chemical treatments.
molecular weight distribution cellulose carbanilate oxidised pulps derivatization solvent
G. Mortha N. Marlin S. Das D. Dallerac D. Lachenal B. Berrima L. Elaloui S. Balaguer
Universit(e) de Grenoble, INP-Pagora, Laboratoire de G(e)nie des Proc(e)d(e)s Papetiers, 461 rue de Unit(e) Mat(e)riaux, Environnement et Energie (06UR12-01), Facult(e) des Sciences de Gafsa - Campus Tembec R&D Tartas, Z.A. de la Madeleine, 55 All(e)e de Megevie, 33174 GRADIGNAN Cedex, France
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
384-390
2011-06-08（万方平台首次上网日期，不代表论文的发表时间）