Now showing items 1-10 of 3816
CHARACTERIZATION OF ALKALICELLULOSE OF PINUS RADIATA AND EUCALYPTUS GLOBULUS BASED ON ITS MOLECULAR WEIGHT AND DEGREE OF ACCESIBILITY
(Sociedad Chilena de Química, 2001)
Cellulose swelling by protic solvents: which properties of the biopolymer and the solvent matter?
The question posed in the title has been addressed by studying the swelling of celluloses at 20 C by twenty protic solvents, including water; linear- and branched-chain aliphatic alcohols; unsaturated aliphatic alcohols, ...
Acetylation of cellulose in LiCl-N,N-dimethylacetamide: first report on the correlation between the reaction efficiency and the aggregation number of dissolved cellulose
The acylation of three cellulose samples by acetic anhydride, Ac(2)O, in the solvent system LiCl/N,N-dimethylacetamide, DMAc (4 h, 110 A degrees C), has been revisited in order to investigate the dependence of the reaction ...
Synthesis and characterization of microcrystalline cellulose produced from bacterial cellulose
In this study, microcrystalline cellulose (MCC) was prepared from the acid hydrolysis of bacterial cellulose (BC) produced in culture medium of static Acetobacter xylinum. The MCC-BC produced an average particle size between ...
Sisal cellulose acetates obtained from heterogeneous reactions
(BUDAPEST UNIV TECHNOL & ECON, 2008)
In the present work, cellulose obtained from sisal, which is a source of rapid growth, was used. Cellulose acetates were produced in heterogeneous medium, using acetic anhydride as esterifying agent and iodine as catalyst, ...
Thermal behavior of cellulose acetate produced from homogeneous acetylation of bacterial cellulose
(Elsevier B.V., 2008-05-30)
Cellulose acetate (CA) is one of the most important cellulose derivatives and its main applications are its use in membranes, films, fibers, plastics and filters. CAs are produced from cellulose sources such as: cotton, ...
All-Cellulose Composite Fibers Obtained by Electrospinning Dispersions of Cellulose Acetate and Cellulose Nanocrystals
Las fibras compuestas totalmente de celulosa se produjeron mediante dispersiones electrospinning que contenían acetato de celulosa (CA) y nanocristales de celulosa (CNC). Las matrices de polímero precursor se obtuvieron ...
Characterization and application of cellulose acetate synthesized from sugarcane bagasse
The synthesis and application of cellulose acetate (CA) from sugarcane bagasse were investigated. Firstly, cellulose was extracted by a sequential treatment with H2SO4 (10% v/v), NaOH (5% w/v), EDTA (0.5% w/V), and H2O2 ...
Nanocellulose patents trends: a comprehensive review on patents on cellulose nanocrystals, microfibrillated and bacterial cellulose
(Bentham Science Publishers, 2013-01)
Cellulose nanoparticles (i.e. cellulose elements having at least one dimension in the 1-100nm range) have received increasing attention during the last decade. This is not only evident in academic articles, but it is also ...
Probing the dependence of the properties of cellulose acetates and their films on the degree of biopolymer substitution: use of solvatochromic indicators and thermal analysis
Although cellulose acetates, CAs, are extensively employed there is scant information about the systematic dependence of their properties on their degree of substitution, DS; this is the subject of the present work. Nine ...