A5016012046- Lignin and Wood Chemistry
- Polymer composites and self-healing
- Natural Fiber Reinforced Composites
- Advanced Cellulose Research Studies
- Polymer crystallization and properties
- Polymer Nanocomposites and Properties
- biodegradable polymer synthesis and properties
- Metal and Thin Film Mechanics
- Eosinophilic Disorders and Syndromes
- Biochemical and biochemical processes
- Amyloidosis: Diagnosis, Treatment, Outcomes
- Sarcoidosis and Beryllium Toxicity Research
- Silicone and Siloxane Chemistry
- Advanced Fiber Optic Sensors
- Corrosion Behavior and Inhibition
- Copper Interconnects and Reliability
- Proteins in Food Systems
- Microplastics and Plastic Pollution
- Enzyme-mediated dye degradation
- Semiconductor materials and devices
- Tribology and Wear Analysis
- Cardiomyopathy and Myosin Studies
- Liquid Crystal Research Advancements
- Nanocomposite Films for Food Packaging
- Advanced Algebra and Logic
Escola Bahiana de Medicina e Saúde Pública
2025
Universidade Federal do ABC
2014-2022
Current challenges highlight the need for polymer research using renewable natural sources as a substitute petroleum-based polymers.The use of polyols obtained from combined with reuse industrial residues such lignin is an important agent in this process.Different compositions polyurethane-type materials were prepared by combining technical Kraft (TKL) castor oil (CO) or modified (MCO1 and MCO2) to increase their reactivity towards diphenylmethane diisocyanate (MDI).The results indicate that...
This work evaluates the peeling resistance of PBAT-kraft lignin (KL) blend films as a laminated food packaging layer. PBAT-KL were obtained by extrusion with 0, 1, 3, 5, and 10 wt% KL. The homogeneity miscibility investigated atomic force microscopy (AFM) dynamic mechanical analysis (DMA), respectively. Contact angle measurements carried out to quantify changes in surface energy. Multilayer composites lamination, which bonded polyethylene layer using polyurethane adhesive. Peeling specimens...
Several efforts have been dedicated to the development of lignin-based polyurethanes (PU) in recent years. The low and heterogeneous reactivity lignin hydroxyl groups towards diisocyanates, arising from their highly complex chemical structure, limits application this biopolymer PU synthesis. Besides well-known differences aliphatic aromatic groups, experimental work which both types hydroxyl, especially ones present syringyl (S-unit), guaiacyl (G-unit), p-hydroxyphenyl (H-unit) building...
Owing to its chemical structure, wide availability and renewable nature, lignin is a promising candidate for the partial replacement of fossil-based raw material in synthesis epoxy resins. Its poor compatibility has been reported be one main drawbacks this domain. On other hand, well-established modification method epoxidation used many years improvement compatibility. However, extent effect on bio-based mechanical properties, applied as adhesives, still an open question literature. In...
Fundamento: A cardiomiopatia amiloide por transtirretina (TTR) associada à VAL142Ile manifesta-se tipicamente em pacientes na sexta ou sétima décadas de vida, sendo uma das formas mais comuns amiloidose cardíaca hereditária. Estudo tem como objetivo caracterizar algumas manifestações clínicas, laboratoriais e ecocardiográficas com a variante genética VAL142Ile, ajudando melhorar o conhecimento sobre comportamento fenotípico dessa entre nós. Método: transversal 31 diagnóstico insuficiência...
Low surface energy and poor adhesion are well-known characteristics of polypropylene (PP). Surface treatments such as plasma, corona, laser usually applied to overcome these limitations. However, current studies highlight the incorporation hydrophilic or amphiphilic polymers into hydrophobic low-surface-energy an alternative for increasing thus improving adhesion. Lignin could be a promising polymer use in energy. In this work, PP/kraft lignin composites were obtained by incorporating up 5...
Lignin is a natural polymer composed primarily of phenylpropanoid structures with an abundance reactive groups: aliphatic and aromatic hydroxyls, phenols, carbonyls. Considering the large quantity hydroxyl groups, lignin has significant potential as replacement for petroleum-based polyols in polyurethane (PU) synthesis value-added, renewable raw material this purpose. Several methods lignin-based are reviewed paper thermoplastic systems: direct incorporation, chemical modification...
During the last years, several efforts were dedicated to development of lignin-based polyurethane adhesives, in which phase separation and brittleness most significant reported limitations. Hydroxypropylation emerged as a feasible method overcome their restricted performance, since this generates lignin with higher reactivity branched molecular structure, at different extends. However, effect hydroxypropylation on properties PU adhesives remains unclear. In work, mixtures lignins castor oil...
Polypropylene (PP) is a multifunctional and widely applied polymer. Nevertheless, its low energy surface poor adhesion are well-known might impair some prospective applications. Aiming to overcome these limitations, PP composites can be as tool enhance then increase practical adhesion. In this work, Kraft lignin (KL) was chemically modified blended with PP. short, KL hydroxypropylated further reacted acetic anhydride (A-oxi-KL) or maleic (M-oxi-KL). Lignin modifications were confirmed by...
For the first time, novel experimental technique Temperature Modulated Optical Refractometry (TMOR) was employed for cocoa butter thermal transitions characterization. The average refractive index (NMEAN), volume (v) change, and volumetric expansion coefficient ( β q ) as well dynamic quantities ′ ″ (real imaginary coefficient, respectively) were monitored during cooling heating compared to heat flow curves obtained via standard scanning calorimetry (DSC). investigation of these showed that...
Sterically hindered phenols are an important class of synthetic antioxidants for polymers, commonly incorporated to inhibit polyolefins or polyesters oxidation. However, use is under restricted regulation due their potential health risk and environmental impacts. Thus, great interest has been attracted the phenol-based natural antioxidant such as lignin. This work aimed evaluate thermostability kraft lignin (KL) a when into poly(butylene adipate-coterephthalate) (PBAT) matrix. PBAT-KL films...
Zirconium based metal pretreatments have become widely used in recent years as a substitute for phosphate deposition on steel alloys and chromate aluminum industrial applications. The choice of zirconium intermediate layer follows from its ecologic sustainability − decreased water energy consumption, vehicle weight reduction, low byproduct generation during processing. Here we describe our investigations characterization method converted oxide thin films deposited by plasma method. film...