PAPERmaking! g FROM THE PUBLISHERS OF PAPER TECHNOLOGY Volume 1, Number 1, 2015
PAPERMAKING CHEMISTRY A preparation method of cellulose fiber networks reinforced by glutaraldehyde- treated chitosan, T. Wu & R. Farnood, Cellulose , 22 (3). An eco-friendly polymeric additive was developed to increase the dry and wet strengths of cellulose fibre networks. The surface morphology of cellulose fibres deposited with GA-treated chitosan was examined by scanning electron microscopy. The effects of glutaraldehyde-chitosan treatment on tear resistance and colour properties were also investigated. Biobased polymers and cationic microfibrillated cellulose as retention and drainage aids in papermaking: Comparison between softwood and bagasse pulps, M. Diab et al , Industrial Crops and Products , 72. Water soluble cationic chitosan and surface- modified microfibrillated cellulose were prepared and characterised; both were used with bentonite in order to improve drainage and filler retention in paper handsheets made from softwood and bagasse pulps. Performance was compared with a commercially available cationic polyacrylamide. Preparation and property of waterborne UV-curable chain-extended polyurethane surface sizing agent: Strengthening and waterproofing mechanism for cellulose fiber paper, H. Wang et al , Journal of Applied Polymer Science , 132 (31). Waterborne UV-curable polyurethane (UWPU) dispersions with different hydrophilicity and functionalities were prepared by varying the content of dimethylol butanoic acid and pentaerythritol triacrylate. The obtained UWPU could be directly used as an effective and fast drying surface sizing agent for cellulose fibre paper. Elasto-capillary collapse of circular tubes as a model for cellulosic wood fibres, M. Soleimani et al , Journal of Materials Science , 50 (15). Wood-fibre conformation affects paper properties in various paper-product categories, such as packaging, printing, and absorbents. To quantify this process, the authors theoretically and experimentally investigate deformation of a circular tube under capillary pressure. This elasto-capillary model elucidates the influences of wetting angle, tube-wall flexibility, and hole size on the tube deformation. The results prove that capillarity can collapse the fibre lumen, either partially or completely, depending principally on the fibre-wall flexibility. Preparation and characterization of calcium carbonate – titanium dioxide core – shell (CaCO 3 @TiO 2 ) nanoparticles and application in the papermaking industry, H. Tao et al , Powder Technology , 283. Carbonization was selected to prepare calcium carbonate, titanium sulphate was the titanium source, and urea was the precipitant to synthesise the target product with the direct precipitation method. The whiteness of the CaCO 3 @TiO 2 filler-containing paper sheet was 73.8%, which is similar to TiO 2 -incorporated paper (73.16%), and higher by about 3% than pure fibre paper (70.35%). PIGMENTS Fabrication of TiO2/EP super-hydrophobic thin film on filter paper surface, Z. Gao et al , Carbohydrate Polymers , 128. A composite filter paper with super-hydrophobicity was obtained by adhering micro/nano structure of amorphous titanium dioxide on the filter paper surface with modifying low surface energy material. By virtue of the coupling agent, which plays an important part in bonding amorphous titanium dioxide and epoxy resin, the structure of super-hydrophobic thin film on the filter paper surface is extremely stable. This method offers an opportunity to the practical applications of the super-hydrophobic filter paper.
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Technical Abstracts
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