PAPERmaking! FROM THE PUBLISHERS OF PAPER TECHNOLOGY Volume 3, Number 2, 2017
Lignocellulosic micro/nanofibers from wood sawdust applied to recycled fibers for the production of paper bags, Quim Tarrés et al , International Journal of Biological Macromolecules, 105 (1). In the present work, lignocellulosic micro/nanofibers (LCMNF) were produced from pine sawdust. For that, pine sawdust was submitted to alkali treatment and subsequent bleaching stages, tailoring its chemical composition with the purpose of obtaining effective LCMNF. The obtained LCMNF were characterized and incorporated to recycled cardboard boxes with the purpose of producing recycled paper. Overall, the studied strategies could allow a significant reduction of paper basis weight, with the consequent material saving and, thus, contribution to the environment. STARCHES Interaction of industrially relevant cationic starches with cellulose, Katrin Niegelhell et al , Carbohydrate Polymers , 179. Industrially relevant, commercially available cationic starches have been investigated towards their interaction capacity with cellulose thin films derived from trimethylsilyl cellulose (TMSC). The starches used in this study stem from different sources (potato, pea, corn) and featured rather low degrees of substitution ranging from 0.030 to 0.062. The interaction of those starches with cellulose thin films was studied by surface plasmon resonance spectroscopy under different flow conditions. Properties of heated aqueous starch dispersions dependent on the preparation conditions, Marco Ulbrich and Eckhard Flöter, Starch – Stärke , 69 (9-10). The solution state of starch was investigated depending on several factors. Impacts on the preparation of aqueous starch pastes were examined with respect to solubility and molecular characteristics of the starch existent in the two phases. Different initial molecular states of the starch (native potato and three acid-thinned [AT] products), different disintegration temperatures (95, 125, and 155°C) as well as a high-shear after-treatment of the dispersion using an Ultra-Turrax were tested systematically. TESTING Measurement of the flexibility of wet cellulose fibres using atomic force microscopy, Torbjörn Pettersson et al , Cellulose , 24 (10). Flexibility and modulus of elasticity data for two types of wet cellulose fibres using a direct force – displacement method by means of AFM are reported for never dried wet fibres immersed in water. For BSW the modulus of elasticity ranges from 1 to 12 MPa and for TMP between 15 – 190 MPa. These data are lower than most other available pulp fibre data and comparable to a soft rubber band. Reasons for the difference can be that our measurements with a direct method were performed using never dried fibres immersed in water while other groups have employed indirect methods using pulp with different treatments. Long-chain ionic liquid based mixed hemimicelles and magnetic dispersed solid- phase extraction for the extraction of fluorescent whitening agents in paper materials, Qing Wang et al , Journal of Separation Science , 40 (11). A novel mixed hemimicelles and magnetic dispersive solid-phase extraction method based on long-chain ionic liquids for the extraction of five fluorescent whitening agents was established. The present method was applied to extract the fluorescent whitening agents in two kinds of paper samples, obtaining satisfactory results. All showed results illustrate that the detection sensitivity was improved and the proposed method was a good choice for the enriching and monitoring of trace fluorescent whitening agents.
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Technical Abstracts
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