Nanostructured cellulose (NSC) serves as a promising candidate for composite products. The aim of the study was to develop nanostructurated cellulose (NSC) preparation methods from bleached birch pulp and bacterial cellulose (BC). BC has ribbon-shaped fibrils, high crystallinity degree, higher water holding capacity and higher degree of polymerization. BC creates interest as a new raw material for obtaining nanoparticles. At the LS Institute of Wod Chemistry thermocatalytic method is developed and later improved by chemical oxidation pre-treatment. Also method of regeneration of NSC from ionic liquids (IL) and traditional acid hydrolysis were applied. Thermocatalytic method: materials are impregnated with a weak acid (HCl) solution and thermally treated, then dispersed in water medium in a ball mill. To improve thermocatalytic method TEMPO (employing 2,2,6,6-tetramethyl-piperidinyl-1-oxyl radical) catalysed oxidation pre-treatmen was used. When using another oxidizer from traditional ones like periodate, perchlorate or persulphate for chemical pre-treatment destructed pulp sample is mixed with oxidizer that has been dissolved in HCl and heated. Cellulose sample is washed with deionized water and afterwards treated by mixing and heating with NaOH and following washing. To obtain nanoparticle gel the grinding in a ball mill is required. Many problems for thermocatalytic method are solved by using oxidizer – the energy consumption is decreased by 80% during the grinding, obtained homogeneous nanoparticles with certain shape. Crystallinity degree increase from 60% to 80-90%. Ionic liquids (IL) are new eco-friendly solventsfor cellulose dissolution. IL’s have abbility to modificate cellulose, both - physically and chemically, even to nanoparticles in case of specific IL and sonification. Regeneration method was performed with 1-butyl-methylimidazolium hydrogen sulfate (Bmim HSO4) IL. Acid hydrolysis was carried out in the traditional way with 64% H2SO4 , followed by dialysis . Particles obtained were analyzed with Malvern “ZetaNanosizer”, atomic force microscopy (AFM), electron scanning microscopy (ESM) and x-ray diffraction (XRD).

Properties of nanocellulose from wood pulp and bacterial cellulose obtained by different methods

249th National Meeting (2015)

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