Results 91 to 100 of about 23,214 (252)

Liquefaction o Kraft Lignin at Atmospheric Pressure

Journal of Renewable Materials, 2019
Kraft lignin was liquefied using polyethylene glycol #400 (PEG) and glycerol (G) in a weight ratio of 80/20 (w/w) and sulphuric acid (SA) as catalyst under atmospheric pressure at 160ºC. The three independent variables: reaction time (60, 80 and 100 min), percentage of lignin (15, 20 and 25%, w/w), and catalyst concentration (0, 3 and 6%, w/w), were ...
Silvia Helena Fuentes da Silva, Patricia Soares Bilhalva dos Santos, Darci Alberto Gatto, Maria Angeles, null res, Itziar Egs   +5 more
openaire   +2 more sources

Recent Developments in Sustainable Composites for Printed Circuit Boards (PCBs): A Review

Macromolecular Materials and Engineering, EarlyView.
This review presents the potential of using natural plant fibers and biodegradable polymers as sustainable printed circuit boards (PCBs). This review provides future directions in innovation and sustainable PCBs development. Bio‐composites PCBs are both environmentally friendly and sustainable due to the natural fibres they contain.
Erdem Selver, Ayca Dogrul Selver, Angela Daniela La Rosa, Abu Saifullah, Zhongyi Zhang, Stephen Driver, Jack Herring, Hom Nath Dhakal   +7 more
wiley   +1 more source

Bio‐Based Epoxy Resins from Estragole: Achieving High Glass Transition Temperatures Comparable to DGEBA and Simultaneously Low Viscosities

Macromolecular Materials and Engineering, EarlyView.
Two novel bio‐based epoxy monomers, diglycidyl‐4‐allylphenol (DG‐4A) and triglycidyl‐diallylphenol (TG‐DA), derived from estragole (92% and 72% bio‐content), were synthesized and cured with isophorone diamin (IPDA) and 4,4´‐diaminodiphenyl sulfone (DDS). The resins show high Tgs, with DG‐4A reaching and TG‐DA exceeding DGEBA‐based systems. These resins
Florian Bauer, Elisabeth Schamel, Herbert Schlachter, Gerd Wehnert, Dominik Söthje   +4 more
wiley   +1 more source

Effect of particle size on the surface properties and morphology of ground flax [PDF]

, 2013
Flax fibers were ground with a ball-mill and four fractions with different size ranges were collected by sieving. These were tested for water sorption, degree of polymerization (DP), copper number, hydroxyl number and analyzed by X-ray diffraction (XRD),
Bandi, Éva, Csiszár, Emília, Fekete, Erika, Koczka, Béla, Sajó, István E., Tóth, András   +5 more
core   +1 more source

Sustainable photoresists from Kraft lignin

Monatshefte für Chemie - Chemical Monthly
Abstract Photoresists are important materials for modern societies as they are decisive components in the fabrication of integrated circuits for semiconductors. Typical materials in such applications are based on synthetic fossil-based polymers such as epoxy resins or novolac resins, demonstrating a need to explore alternative materials that ...
Stefanie M. Müller, Jana B. Schaubeder, Janine Maier, Werner Schlemmer, Stefan Spirk   +4 more
openaire   +1 more source

Stabilized Cellulase in Chitosan–Polyvinyl Alcohol Biopolymer Beads for Sustainable Enzymatic Deinking of Recycled Paper

ChemistryOpen, EarlyView.
A stable and reusable biocatalyst, cellulase@Cs/PVA/Ga, is engineered by immobilizing cellulase onto glutaraldehyde‐activated chitosan (Cs) and coating it with polyvinyl alcohol. This composite system enhances enzymatic stability and efficiency for the sustainable deinking of recycled newspaper, offering a green alternative to harsh chemical treatments.
Parisa Chakeri, Ghasem Mohammadi‐Nejad, Ghasem Hosseini Salekdeh, Shohreh Ariaeenejad, Azadeh Lohrasbi‐Nejad   +4 more
wiley   +1 more source

Modification of Kraft Lignin with Dodecyl Glycidyl Ether

ChemistryOpen, 2019
Kraft lignin (KL) is extensively produced in industry but is mainly burned as fuel. To broaden its use, KL was grafted with dodecyl glycidyl ether to alter its thermal properties.
Norah S. Alwadani, Prof. Pedram Fatehi
doaj   +1 more source

Effect of Kraft Pulping Pretreatment on the Chemical Composition, Enzymatic Digestibility, and Sugar Release of Moso Bamboo Residues

BioResources, 2014
In this work, kraft pulping was carried out on moso bamboo residues as a pretreatment and its impact on the chemical compositions and the digestibility of the sample was investigated.
Caoxing Huang, Qiulu Chu, Yihui Xie, Xin Li, Yongcan Jin, Douyong Min, Qiang Yong   +6 more
doaj   +1 more source

Mechanical Performance Under Compressive Load of Carboxylated Nitrile Rubber and Kraft Lignin Composites

Polymer Composites, EarlyView.
Lignin dispersion in carboxylated nitrile rubber (XNBR) is enhanced at 7% carboxylic acid, significantly improving the composite's compressive mechanical performance for sealing applications. ABSTRACT Lignin is a promising biobased material that enhances the sustainability of rubber composites as a reinforcing filler.
Gustavo Ninho Campos, Elisson Brum Dutra da Rocha, Katrine Paiva, Marcos Vinicus Colaço, Cristina Russi Guimarães Furtado, Marco Antonio Gaya de Figueiredo, Ana Maria Furtado de Sousa   +6 more
wiley   +1 more source

Synthesis of lignin based composites of TiO2 for potential application as radical scavengers in sunscreen formulation

BMC Chemistry, 2019
Titanium dioxide (TiO2) is added in sunscreens due to its ability to absorb ultraviolet (UV) light. However, upon irradiation of UV light, reactive oxygen species particularly hydroxyl radical which can damage human skin will be generated. In this study,
Mohamad Nasir Mohamad Ibrahim, Anwar Iqbal, Chai Chuan Shen, Showkat Ahmad Bhawani, Farook Adam   +4 more
doaj   +1 more source