PAPERmaking! FROM THE PUBLISHERS OF PAPER TECHNOLOGY Volume 3, Number 2, 2017
based pulp making has higher environmental impacts, which are mainly due to higher energy and chemical requirements. However, the environmental impacts of wheat straw- based pulp making are lower than hemp and flax based pulp making from previous studies. If carbon sequestration is taken into account in pulp making industry, wheat straw- based pulp making is a net emitter rather than a net absorber of carbon dioxide. NANO-SCIENCE Mechanical and chemical dispersion of nanocelluloses to improve their reinforcing effect on recycled paper, Cristina Campano et al , Cellulose , online. The use of nanocelluloses as strength-enhancing additives in papermaking is widely known since both cellulose nanofibers (CNF) and nanocrystals (CNC) present similar composition than paper but their exceptional properties in the nanometre scale confers a paper quality enhancement. However, some agglomeration problems in CNF and CNC through hydrogen bonding cause a lower improvement of mechanical properties of paper. Therefore, a better dispersion of both nanocelluloses can maximize their effect on paper properties, thus reducing the required dose to get the same increment in tensile strength and then reducing material costs. This study can be of great interest of those researchers trying to implement the use of nanocelluloses as strength additive in papermaking. Nanofibrillation of deep eutectic solvent-treated paper and board cellulose pulps, Terhi Suopajärvi et al , Carbohydrate Polymers , 169. In this work, several cellulose board grades, including waste board, fluting, and waste milk container board, were pretreated with green choline chloride-urea deep eutectic solvent (DES) and nanofibrillated using a Masuko grinder. The properties of the nanofibrils after disc grinding were compared with those obtained through microfluidization. Overall, the choline chloride- urea DES pretreatment significantly enhanced the nanofibrillation of the board pulps in both nanofibrillation methods. Consequently, the DES chemical pretreatment appears to be a promising route to obtain cellulose nanofibrils from waste board and paper. Biocompatible microcrystalline cellulose particles from cotton wool and magnetization via a simple in situ co-precipitation method, Mehnaz Rashid et al , Carbohydrate Polymers , 170. This investigation describes the preparation of magnetically doped degradable microcrystalline cellulose (MCC) nanocomposite particles with application potential in biotechnology, solid support for biomolecule/water purification, oil recovery from water and beyond. The nanocomposite dispersion was colloidally stable and the particles responded when external magnetic field was applied. It was possible to control the magnetic property by regulating the content of iron oxide. Hydrophobization and smoothing of cellulose nanofibril films by cellulose ester coatings, Pia Willberg-Keyriläinen et al , Carbohydrate Polymers , 170. Cellulose nanofibril (CNF) films may find new applications, for example in printed electronics, if the surface smoothness of CNF films can be improved. One way to improve surface smoothness is to use thin coating solutions with zero porosity, such as molar mass controlled cellulose ester coatings. In this study, we have coated CNF films using molar mass controlled cellulose esters with different side chain lengths forming 3-layer film (ester-CNF-ester). These coatings improved significantly the smoothness of CNF films. The 3-layer films have also good water vapor barrier and mechanical properties and the films are heat-sealable, which enable various new applications in the future.
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Technical Abstracts
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