32 documents found, page 1 of 4
Poly(butylene succinate)-based composites with technical and extracted lignins ...
Melro, Elodie; Duarte, Hugo; Eivazi, Alireza; Costa, Carolina; Faleiro, Maria Leonor; Rosa Da Costa, Ana; Antunes, Filipe E.; Valente, Artur J. M.Poly(butylene succinate) (PBS) has been drawing attention as a reliable biodegradable and sustainable alternative to synthetic petroleum-based polymers. In this study, PBS-lignin composites were developed using a recently extracted lignin (LA-lignin) from pine wood residues employing an innovative sustainable approach. These composites were systematically compared with PBS-based composites formed with commonly ...
Adding knowledge to the design of safer hydrophobically modified poly(acrylic) ...
Tavares, Jorge; Venâncio, Cátia; Duarte, Cláudia Margarida Gouveia; Antunes, Filipe E.; Lopes, IsabelThe architecture of hydrophobically modified polymers can be tailored to produce variants with different levels of functionality. This allows industry to apply rational design methods for the development of more environmentally friendly materials. In the present work, the ecotoxicity of six variants of hydrophobically modified poly(acrylic) acids (HMPAA), obtained by changing the crosslinked conformation, inser...
Modification of chicha gum antibacterial activity, ex vivo mucoadhesion, antiox...
Freitas, Alessandra R.; Ribeiro, António J.; Ribeiro, Alessandra B.; Collado-Gonzalez, Maria Del Mar; Silva, Luís R.; Alves, Luís; Melro, ElodieThe aim of the present work was to modify the exuded gum of Sterculia striata tree by an amination reaction. The viscosity and zero potential of the chicha gum varied as a function of pH. The modification was confirmed by X-ray diffraction (XRD), infrared spectroscopy (FTIR), size exclusion chromatography (SEC), zeta potential, thermogravimetric analysis (TG), and differential scanning calorimetry (DSC). Furthe...
Levulinic acid-based “green” solvents for lignocellulose fractionation: on the ...
Melro, Elodie; Riddell, Alexander; Bernin, Diana; Rosa Da Costa, Ana; Valente, Artur J. M.; Antunes, Filipe E.; Romano, Anabela; Norgren, MagnusThe high potential use of lignin in novel biomaterialsand chemicalsrepresents an important opportunity for the valorization of the mostabundant natural resource of aromatic molecules. From an environmentalperspective, it is highly desirable replacing the hazardous methodscurrently used to extract lignin from lignocellulosic biomass anddevelop more sustainable and environmentally friendly approaches.Therefore, i...
Engineering novel phenolic foams with lignin extracted from pine wood residues ...
Melro, Elodie; Duarte, Hugo; Antunes, Filipe E.; Valente, Artur J.M.; Romano, Anabela; Norgren, Magnus; Medronho, BrunoPhenolic foams are typically produced from phenolic resins, using phenol and formaldehyde precursors. Therefore, common phenolic foams are non-sustainable, comprising growing environmental, health, and economic concerns. In this work, lignin extracted from pine wood residues using a "green" levulinic acid-based solvent, was used to partially substitute non-sustainable phenol. The novel engineered foams were sys...
On the Development of Phenol-Formaldehyde Resins Using a New Type of Lignin Ext...
Melro, Elodie; Antunes, Filipe E.; Valente, Artur J. M.; Duarte, Hugo; Romano, Anabela; Medronho, BrunoResole resins have many applications, especially for foam production. However, the use of phenol, a key ingredient in resoles, has serious environmental and economic disadvantages. In this work, lignin extracted from pine wood using a "green" solvent, levulinic acid, was used to partially replace the non-sustainable phenol. The physicochemical properties of this novel resin were compared with resins composed of...
On the development of Phenol-Formaldehyde resins using a new type of lignin ext...
Melro, Elodie; Antunes, Filipe E.; Valente, Artur J. M.; Duarte, Hugo; Romano, A.; Medronho, BrunoResole resins have many applications, especially for foam production. However, the use of phenol, a key ingredient in resoles, has serious environmental and economic disadvantages. In this work, lignin extracted from pine wood using a “green” solvent, levulinic acid, was used to partially replace the non-sustainable phenol. The physicochemical properties of this novel resin were compared with resins composed of...
Enhancing Lignin Dissolution and Extraction: The Effect of Surfactants
Melro, Elodie; Valente, Artur J. M.; Antunes, Filipe E.; Romano, Anabela; Medronho, BrunoThe dissolution and extraction of lignin from biomass represents a great challenge due to the complex structure of this natural phenolic biopolymer. In this work, several surfactants (i.e., non-ionic, anionic, and cationic) were used as additives to enhance the dissolution efficiency of model lignin (kraft) and to boost lignin extraction from pine sawdust residues. To the best of our knowledge, cationic surfact...
Mini-review: Synthetic methods for the production of cationic sugar-based surfa...
Jesus, Carolina F.; Alves, Andreia A. S.; Fiuza, Sónia M.; Murtinho, Dina; Antunes, Filipe E.Surfactants are ubiquitously used and are currently indispensable in our daily life. However, the increased surfactant production has given rise to some environmental and health concerns making it imperative to look for new sustainable and viable alternatives. Sugar based surfactants, sourced from renewable sources are an excellent candidate to solve this problem. This class of surfactants has been developed in...
Enhancing lignin dissolution and extraction: the effect of surfactants
Melro, Elodie; Valente, Artur J. M.; Antunes, Filipe E.; Romano, Anabela; Medronho, BrunoThe dissolution and extraction of lignin from biomass represents a great challenge due to the complex structure of this natural phenolic biopolymer. In this work, several surfactants (i.e., non-ionic, anionic, and cationic) were used as additives to enhance the dissolution efficiency of model lignin (kraft) and to boost lignin extraction from pine sawdust residues. To the best of our knowledge, cationic surfact...