11 documents found, page 1 of 2
From traditional paper to nanocomposite films: Analysis of global research into...
Garrido-Romero, Manuel; Aguado, Roberto; Moral, Ana; Brindley, Celeste; Ballesteros, MentaThis bibliometric study encompasses all publications between 2000 and 2020 on the production of cellulose-containing food packaging, often proposed as an alternative to petro-based materials. Results show a fast-growing interest in this area, especially during the last decade, with 1029 documents published in high-impact journals. In a topic where countries such as Italy, Sweden and Spain show high scientific p...
Micro-/Nanofibrillated Cellulose-Based Coating Formulations: A Solution for Imp...
Sharma, Mohit; Aguado, Roberto; Murtinho, Dina; Valente, Artur J. M.; Ferreira, Paulo J. T.The use of micro-/nanofibrillated celluloses (M/NFCs) is often considered for the enhancement of paper properties, while it is still challenging to use them in lower weight gain coatings. This work explores how they might be used on the paper surface to improve the printing quality. In this regard, M/NFCs were produced using different pre-treatment methods, including mechanical (m-MFC), enzymatic (e-MFC), TEMPO...
Improving the Barrier Properties of Paper to Moisture, Air, and Grease with Nan...
Mazega, André; Tarrés, Quim; Aguado, Roberto; Pèlach, Maria Àngels; Mutjé, Pere; Ferreira, Paulo J. T.; Delgado-Aguilar, MarcFood packaging manufacturers often resort to lamination, typically with materials which are neither non-biodegradable nor biobased polymers, to confer barrier properties to paper and cardboard. The present work considers a greener solution: enhancing paper's resistance to moisture, grease, and air by aqueous coating suspensions. For hydrophobization, a combined approach between nanocellulose and common esterify...
Novel approach on the synthesis of starch betainate by transesterification
Sharma, Mohit; Aguado, Roberto; Murtinho, Dina; Valente, Artur J. M.; Ferreira, Paulo J. T.Transesterification of starch with methyl betainate was studied for the first time, both in aprotic media and in solid state, and both under alkaline and acidic conditions. Betaine hydrochloride was first esterified in methanol, attaining a conversion of 86%. Starch was then converted into starch betainate in either N,N-dimethylformamide or dimethyl sulfoxide, and using sulfuric acid as catalyst or pre-activati...
Synergetic effect of cationic starch (ether/ester) and Pluronics for improving ...
Sharma, Mohit; Aguado, Roberto; Murtinho, Dina; Valente, Artur J. M.; Ferreira, Paulo J. T.Improving the printability of paper is still a relevant challenge, despite the fast development of digital communications. While it is well-known that cationic starches enhance ink density, their commercial paper-grade forms are limited to ethers with low degree of substitution. This work addresses the underexplored potential of highly substituted cationic starch for paper coating and its combination with tri-b...
Synergetic effect of cationic starch (ether/ester) and Pluronics for improving ...
Sharma, Mohit; Aguado, Roberto; Murtinho, Dina; Valente, Artur J. M.; Ferreira, Paulo J.Improving the printability of paper is still a relevant challenge, despite the fast development of digital communications. While it is well-known that cationic starches enhance ink density, their commercial paper-grade forms are limited to ethers with low degree of substitution. This work addresses the underexplored potential of highly substituted cationic starch for paper coating and its combination with tribl...
Cyclodextrin Polymers and Cyclodextrin-Containing Polysaccharides for Water Rem...
Cova, Tânia F.; Murtinho, Dina; Aguado, Roberto; Pais, Alberto A. C. C.; Valente, Artur J. M.Chemical pollution of water has raised great concerns among citizens, lawmakers, and nearly all manufacturing industries. As the legislation addressing liquid effluents becomes more stringent, water companies are increasingly scrutinized for their environmental performance. In this context, emergent contaminants represent a major challenge, and the remediation of water bodies and wastewater demands alternative ...
Association of antioxidant monophenolic compounds with β-cyclodextrin-functiona...
Aguado, Roberto; Murtinho, Dina; Valente, Artur J. M.Polysaccharide substrates loaded with antioxidant and antimicrobial compounds, effectively protected by cyclodextrin moieties, can be a long-lasting solution to confer certain properties to fabrics, paper and other materials. β-Cyclodextrin was attached to α-cellulose, bleached pulp and starch by a two-step esterification with a tetracarboxylic acid. The resulting derivatives were characterized by spectroscopy,...
Novel approach on the synthesis of starch betainate by transesterification
Sharma, Mohit; Aguado, Roberto; Murtinho, Dina; Valente, Artur J. M.; Ferreira, Paulo J.Transesterification of starch with methyl betainate was studied for the first time, both in aprotic media and in solid state, and both under alkaline and acidic conditions. Betaine hydrochloride was first esterified in methanol, attaining a conversion of 86%. Starch was then converted into starch betainate in either N,N-dimethylformamide or dimethyl sulfoxide, and using sulfuric acid as catalyst or pre-activati...
The relevance of the pretreatment on the chemical modification of cellulosic fi...
Aguado, Roberto; Lourenço, Ana F.; Ferreira, Paulo J. T.; Moral, Ana; Tijero, AntonioCationized fibers and other kinds of chemically modified fibers impart many advantages in papermaking, but unfeasibly long reaction times are necessary to attain acceptable degrees of substitution, due to the low reactivity of bleached kraft pulps. In this work, different aqueous pretreatments were tested in order to activate cellulose towards a 60 min-long etherification with a quaternary ammonium reagent. Sev...