PAPERmaking! FROM THE PUBLISHERS OF PAPER TECHNOLOGY Volume 3, Number 2, 2017
Dielectric Losses of Paper in the THz Domain: Literature Review, Needs for Future Research, and Prospective Solutions, Patrick Huber et al , physica status solidi (a) , online. High frequency paper-based electronics is developing fast, with smart yet low cost applications in view. However, the dielectric losses of paper remain a difficult hurdle to overcome. First, the literature on the topic is reviewed and the contributions from moisture, air, mineral filler, and wood constituents to dielectric losses are highlighted. Then, the guidelines for future research are defined, including the need for systematic comparisons in controlled moisture conditions. PACKAGING Rice stubble as a new biopolymer source to produce carboxymethyl cellulose- blended films, Pattrathip Rodsamran & Rungsinee Sothornvit, Carbohydrate Polymers , 171. Rice stubble is agricultural waste consisting of cellulose which can be converted to carboxymethyl cellulose from rice stubble (CMCr) as a potential biomaterial. Plasticizer types (glycerol and olive oil) and their contents were investigated to provide flexibility for use as food packaging material. Overall, results suggest that CMCr can be used to form edible film and coating as a renewable environmentally friendly packaging material. Effect of silver contents in cellulose nanocrystal/silver nanohybrids on PHBV crystallization and property improvements, Heng Zhang et al , Carbohydrate Polymers , 173. Ternary nanocomposites including cellulose nanocrystals/silver nanohybrids (CNC-Ag) and biodegradable poly(3-hydroxybutyrate-co-3-hydroxyvalerate) (PHBV) were prepared by using solution casting. The effect of different AgNPs contents in the nanohybrids on crystallization ability and properties of PHBV was comprehensively investigated. Overall, the good barrier property and lower migration levels in food simulants, high antibacterial ratio of 99.9% and biocompatibility to human MG-63 cells, suggesting its potential application in food packaging related materials. Understanding the mechanisms of oxygen diffusion through surface functionalized nanocellulose films, Maria Soledad Peresin et al , Carbohydrate Polymers , 174. A concept for direct surface modification on self-standing films of cellulose nanofibrils (CNF) is demonstrated using an aminosilane group in cellulose compatible solvent (dimethyl acetamide, DMA). The chemically modified structure efficiently prevents the oxygen molecules from interacting with the nanocellulose film in the presence of water molecules. Experimental evidence on the importance of interfacial processes that hinder the water- cellulose interactions while keeping film’s low affinity towards oxygen is demonstrated. Propolis and chitosan as antimicrobial and polyphenols retainer for the development of paper based active packaging materials, Manuela Rollinia et al , Food Packaging and Shelf Life , 14 (Part B). The research investigates the potential combination of propolis and chitosan to develop a completely bio-based active food packaging material. Propolis glycolic extract was used as antioxidant and antimicrobial, due to its polyphenols content. Two commercial chitosans with different molecular weights were comparatively used as antimicrobial, wet strength additive substitute and polyphenols retainer. Paper antimicrobial activity was confirmed on thinly sliced raw veal meat, where a decrease of intentionally inoculated L. innocua of around 1 log cycle was achieved in 48 h at 4 °C.
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Technical Abstracts
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