Authors:A. Borbély-Kuszmann, E. Brandt-Petrik, G. Liptay, and J. Nagy
Cellulose substituted by organosilicon groups represents a new type of modified cellulose. The silylation changes the physical and chemical properties of cellulose drastically. The thermoanalytical investigation of differently trimethylsilylated cellulose derivatives was carried out under static conditions in air atmosphere. The DTA curves of the cellulose used as starting material are different from those of its silylated derivatives. In the latter a new characteristic exothermic peak appears in the range 320–370°. The value of this maximum depends on the grade of silylation, being shifted towards higher temperatures with higher degrees of substitution.
Pyrolytic process has a promising potential for the environmentally friendly upgrading of lignocellulosic and plastic waste.
Thermogravimetry and pyrolysis-gas chromatography-mass spectrometry (Py-GC/MS) were used to get information about the reactive
decomposition of PCL in binary mixtures with microcrystalline cellulose (MC) or sisal fibres (SF). Preliminary thermogravimetric
investigation showed that biomass is thermally degraded at lower temperatures than PCL and this process has a predominant
influence on the thermal behaviour of the mixtures. Discrepancies between the experimental and predicted TG/DTG profiles were
considered as a measurement of the extent of interactions occurring on co-pyrolysis. It was found that reactivity of PCL was
slightly increased in PCL-SF binary mixtures. Evolution of acidic products from cellulose and hemicelluloses decomposition
may promote PCL degradation in binary mixtures with SF. It seems that the co-pyrolysis process could have potential for the
environmentally friendly transformation of biocomposites.
Sodium, ferric and aluminum salts of oxycellulose and the amphoteric ion exchanger derivatives from cationized oxycellulose
were prepared. Thermal behaviour of the different samples was investigated by thermal gravimetric analysis (TG) and derivative
thermogravimetric (DTG) technique. The rate constant and the activation energy were estimated. Infrared spectroscopy of the
different samples were investigated, analyzed and discussed.
Authors:Antoine-Michel Siouffi, Patrick Piras, and Christian Roussel
The paper reviews the latest achievements in chiral separation by planar chromatography (PC) since 2001. The emphasis is on cellulose derivatives and, especially, microcrystalline cellulose triacetate (MCTA). A comparison is made with HPLC data retrieved from Chirbase. It is shown that TLC has some interesting features compared with HPLC. Some enantiomer separations have been successfully achieved by TLC whereas no data are available for HPLC. For tribenzoyl cellulose derivatives general trends for resolution by both TLC and HPLC are discussed. The last part of the paper discusses reasons for the scarcity of publications on chiral separations by either PC or overpressured layer chromatography (OPLC). The possibilities of PC for chiral separations are rather unexploited.
Authors:Rafael Leite de Oliveira, Hernane da Silva Barud, Rosana M. N. de Assunção, Carla da Silva Meireles, Geandre Oliveira Carvalho, Guimes Rodrigues Filho, Younes Messaddeq, and Sidney José Lima Ribeiro
steps of delignification and bleaching. The material in this condition can be employed in the production of cellulosicderivatives; since for production of these derivatives, cellulose must have the highest purity possible [ 6 ].
Authors:Djalma Souza, Teresa Eligio Castillo, and Rubén Jésus Sánchez Rodríguez
Some specific blends of cellulosederivatives with PHAs were studied by Scandola [ 12 ] and Buchanan [ 9 , 13 ]. Scandola noted that the PHB forms miscible blends with the cellulose esters [ 12 ]. On the other hand, Buchanan studied the blends of
Authors:Shun Zhou, Chenghui Wang, Yingbo Xu, and Yuan Hu
decomposition of pure cellulose and pulp paper. Nada et al . have investigated the thermal behavior of cellulose and some cellulosederivatives. Cullis and co-workers [ 14 ] have blended cigarette paper with various inorganic salts and investigated the effect
Authors:Fakhruddin Ahmed, P. K. Gutch, K. Ganesan, and R. Vijayaraghavan
suspending agent should have certain attributes: (1) it should produce a structured vehicle, (2) it should be compatible with other formulation ingredients and (3) it should be nontoxic. Generally used suspending agents in suspension include cellulosic