PAPERmaking! FROM THE PUBLISHERS OF PAPER TECHNOLOGY Volume 3, Number 2, 2017
Unique alkyl ketene dimer Pickering-based dispersions: Preparation and application to paper sizing, Qi Zhao et al , Journal of Applied Polymer Science , 135 (4). Particle- stabilized alkyl ketene dimer (AKD) dispersions were prepared using dodecyl trimethyl ammonium chloride (DTAC)-modified laponite as the stabilizer, and sodium alginate (SA) as the protective colloid. The modification of laponite particles with DTAC, which was characterized by transmission electron microscopy, infrared spectroscopy, and X-ray diffraction technique. The effect of these particles on paper properties, particularly sizing, was measured. Numerical investigation of three-dimensional fiber suspension flow by using finite volume method, Yue Mu et al , Polymer Bulletin , 74 (11). Fibre suspension flow is common in many industrial processes like papermaking and fibre-reinforcing polymer- based material forming. The investigation of the mechanism of fibre suspension flow is of significant importance, since the orientation distribution of fibres directly influences the mechanical and physical properties of the final products. The mathematical model and numerical method proposed in the study can be successfully adopted to predict fibre suspension flow patterns and hence to reveal the fibre orientation mechanism. Multilayer assembly of ionic starches on old corrugated container recycled cellulosic fibers, Hamidreza Rud et al , Polymer International , online. In this study, old corrugated container recycled fibres were treated with polyelectrolyte multilayers consisting of biopolymer cationic starch with two degrees of substitution (DS) each in combination with one anionic starch. Pulp zeta potential, paper strength and the thin layer ellipsometry technique were applied to examine the influence of cationic starch DS on the formation of polyelectrolyte multilayers. The results indicated a significant interaction between the DS of cationic starch and the number of ionic starch layers formed, with strength increase being a function of the number of starch layers. PULPING Utilization of cotton waste for regenerated cellulose fibres: Influence of degree of polymerization on mechanical properties, Rasike De Silva & Nolene Byrne, Carbohydrate Polymers , 174. Cotton accounts for 30% of total fibre production worldwide with over 50% of cotton being used for apparel. In the process from cotton bud to finished textile product many steps are required, and significant cotton waste is generated. Typically only 30% of pre consumer cotton is recycled. Here we use cotton waste lint to produce regenerated cellulose fibres (RCF). The properties of the RCF are characterized and compared to wood pulp RCF. Ultra-high pressure modified cellulosic fibres with antimicrobial properties, Ana M. Salgueiro et al , Carbohydrate Polymers , 175. In this work bleached E. globulus kraft pulp was doped with polyhexamethylene biguanide (PHMB) from an aqueous solution or from a suspension of silica capsules (PHMB@silica) by impregnation under atmospheric or ultra-high pressure (UHP) conditions (500MPa). The antimicrobial properties of pulps were evaluated towards gram-negative E. coli and gram-positive L. innocua bacteria. Hydrogen bonds and twist in cellulose microfibrils, Sridhar Kumar Kannam et al , Carbohydrate Polymers , 175. There is increasing experimental and computational evidence that cellulose microfibrils can exist in a stable twisted form. In this study, atomistic molecular dynamics (MD) simulations are performed to investigate the importance of intrachain hydrogen bonds on the twist in cellulose microfibrils.
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Technical Abstracts
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