PAPERmaking! g FROM THE PUBLISHERS OF PAPER TECHNOLOGY Volume 1, Number 1, 2015
CARBOHYDRATE SCIENCE Hydrated fractions of cellulosics probed by infrared spectroscopy coupled with dynamics of deuterium exchange, C. Driemeier et al , Carbohydrate Polymers , 127. A novel method to selectively probe the non-crystalline, hydrated fractions of cellulosic biomass, using time-resolved infrared spectroscopy. The results provide new insights on molecular and group orientation and on hydrogen bonding in hydrated fractions of cellulosic biomass. A morpholinium ionic liquid for cellulose dissolution, D.G. Raut et al , Carbohydrate Polymers , 130. A new ionic solvent, N-allyl-N-methylmorpholinium acetate, was found to dissolve cellulose readily without any pre-processing of native raw material, and without changing the degree of polymerization of the different celluloses after regeneration. COATING Optimization of synthesis and characterization of oxidized starch-graft-poly(styrene- butyl acrylate) latex for paper coating, S. Cheng et al , Starch – Stärke , 67 (5-6). A three-level, four-variable Box-Behnken design was employed to investigate the effects of the concentration of OS, initiator, monomers, and temperature on the graft copolymerization. Application of the OS-g-P(ST-BA) latex as a binder in paper coating improved the gloss, print gloss, and picking resistance of coated paper. NOVEL PRODUCTS Properties of cellulose/Thespesia lampas short fibers bio-composite films, B. Ashok et al , Carbohydrate Polymers , 127. Cellulose was dissolved in pre cooled environment friendly solvent (aq.7% sodium hydroxide+12% urea) and regenerated with 5%H 2 SO 4 as coagulation bath. Using cellulose as matrix and alkali treated short natural fibers extracted from the newly identified Thespesia lampas plant as fillers the green composite films were prepared. The films were found to be non-toxic. The effect of fibre loading on the tensile properties and thermal stability was studied. Enhanced electromechanical performance of bio-based gelatin/glycerin dielectric elastomer by cellulose nanocrystals, N. Ning et al , Carbohydrate Polymers , 130. In this study, a bio-based gelatine/glycerin (GG) elastomer was used as the DE matrix, and Cellulose nanocrystals (CNCs) were used to improve the mechanical strength of GG elastomer. The results showed that CNCs with a large number of hydroxyl groups disrupted the hydrogen bonds between gelatine molecules and formed new stronger hydrogen bonds with gelatine molecules. Hydrophobic cellulose: a material that expands upon drying, W.C. Chen et al , Cellulose , online. Most known materials shrink upon drying and swell upon wetting, a phenomenon known as dry-shrinkage; and thus are characterised by a dry-shrinkage coefficient either equal or greater than zero. Different from conventional materials, sheets of hydrophobic cellulose fibres expand upon drying, which implies that they exhibit dry- expansion. A mechanism for the dry-expansion of this material is proposed.
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Technical Abstracts
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