PAPERmaking! FROM THE PUBLISHERS OF PAPER TECHNOLOGY Volume 5, Number 1, 2019
Using cellulose fibers to fabricate transparent paper by microfibrillation, Zhenzhen Li et al, Carbohydrate Polymers , Vol.214. Fabricating transparent paper from cellulose nanofibres (CNFs) normally involves high energy or the use of expensive chemicals for the extraction of CNFs from cellulose fibres and time-consuming paper formation processes because of the slow filtration rate of CNFs. In this study, we reported a strategy for the fabrication of transparent paper using microfibrillated cellulose fibres (MFCFs), which were prepared by extracting nanosized fibrils from the cellulose fibre surfaces by a two-step refining process. The transparent paper made from MFCFs shows higher thermal stability, higher tensile strength, higher resistance to deformation, and more flexibility than the nanopaper made from commercial CNFs. This work provides a promising method for the manufacture of transparent paper from cellulose fibres. Poly (lactic acid) composites reinforced with kraft pulp fibres: Production by a papermaking process and characterisation, S Sousa et al, Composites Part A: Applied Science and Manufacturing , Vol.121. Four different pulp fibres, representing short and long cellulose fibres and chemically modified fibres, were tested as reinforcements for poly(lactic acid) composites. A simple papermaking method was used to form the composite sheets, which were further compression moulded. The effects of morphological, chemical, and mechanical characteristics of kraft pulp fibres and their contents on the PLA composite characteristics were investigated. PACKAGING TECHNOLOGY Fabrication and characterization of starch-based nanocomposites reinforced with montmorillonite and cellulose nanofibers, Jiali Li et al, Carbohydrate Polymers , Vol.210. In this study, one-dimensional (1D) cellulose nanofibres (CNFs) were used to stabilise the dispersion of two-dimensional (2D) montmorillonite (MMT) plates in aqueous system. Then the prepared MMT/CNF solution was simultaneously merged into water soluble corn starch (CS) to obtain CS/MMT/CNF composite freestanding films through a casting method. The reinforcing effect from building blocks of MMT and CNF, interfacial interactions of hydrogen and covalent bonding together led to enhanced tensile strength and Young’s modulus, reduced moisture susceptibility and i ncreased transparency of the ternary CS nanocomposites. These extraordinary properties of the ternary nanocomposites clearly point towards a new strategy for designing and fabricating high- performance starch-based nanocomposites by using binary fillers with different geometric shapes and aspect ratio. This kind of ternary nanocomposite can be widely used in food packing and preservation as a biodegradable and green film. Effect of electrolyte on regenerated cellulose film as gold nanoparticle carrier, Lijuan Liu et al, Carbohydrate Polymers , Vol.210. The catalytic performances of gold nanoparticles immobilised on regenerated cellulose films were influenced by cellulose structure. Cellulose was regenerated in aqueous coagulants containing different electrolytes, to fabricate regenerated films with different coagulated network structure and property. Hofmeister sequence can be used to describe regeneration, namely more kosmotropic ions in the coagulants led to cellulose films with more homogeneous coagulated network structure, possibly due to the dehydration of cellulose caused by the ions. Gold nanoparticles were then immobilised on the films to prepare portable catalysts. This work provided not only the fundamental information about the intermolecular interactions between ions and macromolecules, but also an effective approach to construct powerful catalysts.
Technical Abstracts
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