A5009019534- Natural Fiber Reinforced Composites
- Lignin and Wood Chemistry
- Polymer Nanocomposites and Properties
- Advanced Cellulose Research Studies
- biodegradable polymer synthesis and properties
- Polymer crystallization and properties
- Thermochemical Biomass Conversion Processes
- Wood Treatment and Properties
- Flame retardant materials and properties
- Mechanical Behavior of Composites
- Thermal and Kinetic Analysis
- Municipal Solid Waste Management
- Recycling and Waste Management Techniques
- Advanced Theoretical and Applied Studies in Material Sciences and Geometry
- Additive Manufacturing and 3D Printing Technologies
- Material Properties and Applications
- Rocket and propulsion systems research
- Fish Biology and Ecology Studies
- Energetic Materials and Combustion
- Structural Behavior of Reinforced Concrete
- Adsorption and biosorption for pollutant removal
- Aquaculture Nutrition and Growth
- Fiber-reinforced polymer composites
- Recycled Aggregate Concrete Performance
- Concrete and Cement Materials Research
Universidade de Caxias do Sul
2016-2025
Universidade Federal do Rio Grande do Norte
2024
Universidade Federal do Rio Grande do Sul
2012-2014
In this work, the relationship between cellulose crystallinity, influence of extractive content on lignocellulosic fiber degradation, correlation chemical composition and physical properties ten types natural fibers were investigated by FTIR spectroscopy, X-ray diffraction thermogravimetry techniques. The results showed that higher contents associated with lower crystallinity crystallite size can accelerate degradation process reduce thermal stability studied. On other hand, decomposition is...
Abstract In this study, the relationship between wood cellulose crystallinity, influence of extractives on degradation, correlation chemical composition, and physical properties four species were investigated by analysis, Fourier transform infrared (FTIR) spectroscopy, thermogravimetry. The analysis showed that Dipteryx odorata Mezilaurus itauba (ITA) contained a higher quantity lower quantities holocellulose lignin than Eucalyptus grandis (EUG) Pinus elliottii . FTIR spectroscopy indicated...
This paper compares the thermal stability of sawdust different wood species, an important factor in producing reinforced polymers. The compositions two Pinus taeda and Eucalyptus grandis, were determined to evaluate influence main components on this material. species submitted thermogravimetric analysis at heating rates calculate activation energy (Ea) using Flynn-Wall-Ozawa (FWO) Kissinger methods. results suggest that larger quantities holocellulose lignin associated with lower extractive...
Pineapple crown is generally discarded as waste but constitutes an important source of lignocellulosic fibres. In this work, the effect alkaline treatment on chemical composition, pyrolysis kinetics, and thermodynamic characteristics pineapple fibres (PCF) were investigated by Fourier transform infrared spectroscopy (FTIR), scanning electronic microscopy (SEM), X-rays diffraction (XRD), thermogravimetry. Chemical composition analysis indicated cellulose content increased from 18.93 to 57.00%...
A lignin sample was extracted from Eucalyptus grandis sawdust, by the Klason method, and used as adsorbent for removal of methylene blue (MB) aqueous solutions. By using a set complementary analytical tools, appeared to be constituted oxygenated functional groups aromatic moieties, while showing specific surface area 20 m2 g−1 polydisperse particles. Different experimental conditions with various solid liquid ratio, pH, well other external parameters were investigated MB sample. The...
The effect of filler addition and coupling agent content on the mechanical properties morphology wood plastic composites was examined. Using flour as reinforcement recycled expanded polystyrene thermoplastic matrix polymer, a particle-reinforced composite prepared using co-rotating twin-screw extruder. In sample preparation, four levels loading (10, 20, 30, 40 wt%) three (1, 2, 4 were used. influence particle size also evaluated. results showed that short fibers provide higher specific...
In this study Eucalyptus grandis (CEG) and Pinus taeda (CPT) cellulose fibers obtained from kraft sulfite pulping process, respectively, were characterized using Fourier transform infrared (FTIR) spectroscopy thermogravimetry (TGA). The degradation kinetic parameters determined by TGA Coats Redfern method. FTIR results showed that CPT presented a more ordered structure with higher crystallinity than CEG. Thermogravimetric had thermal stability revel for CEG the mechanism occurs mainly random...
In this study Klason lignins from Eucalyptus grandis (LEUG) and Pinus taeda (LPIT) were characterized using Fourier transform infrared (FTIR) spectroscopy thermogravimetry (TGA). The degradation kinetic parameters determined by TGA the Kissinger method. Thermogravimetric results showed that LPIT had higher thermal stability also activation energy than LEUG. FTIR average strength of intermolecular interactions enthalpy hydrogen bond formation among phenolic groups are for demonstrated...
Hemicellulose is one of the most common polysaccharides found in nature. Its use as a green and sustainable raw material for industries desirable. In this work, an alkaline-alcoholic method was used to extract hemicelluloses from sugarcane bagasse. After extraction, films with 2%, 3% 4% (w/v) hemicellulose were produced. The films' morphology, thickness, water solubility, tensile properties thermal stability evaluated. Fourier Transform Infrared Spectroscopy (FTIR) results reveal that...
Pecan nutshell (PNS) is generally treated as a residue or being used in low value applications. The understanding of thermal, chemical and morphologic characteristics PNS great importance to determinate its application field possibilities. There are some studies for applications, but none them characterized it polymer composites application. So, this study intends characterize focusing on polymeric were through morphological, thermal analysis. Degradation kinetics was performed...
The thermal behavior of lignins from softwood and hardwood species has been investigated using thermogravimetry differential scanning calorimetry.Klason Lignin Pinus taeda Klason lignin Eucalyptus grandis were studied.The calorimetry results showed that both studied presented similar glass transition temperature.Thermogravimetric the degradation occurs in three stages.The is more thermally stable than grandis, probably because higher stability guaiacyl units lignin.The initiate by a...
The influence of extractive content on the thermal stability and kinetic degradation two wood species has been investigated using chemical analysis thermogravimetry.Two were studied: Pinus taeda Eucalyptus grandis.Thermogravimetric results showed that higher contents in accelerate process promote an increase conversion values at lower temperatures reducing stability.After removing extractives from for both increased.The also demonstrated prior information about composition can be helpful to...
The objective of this study was to obtain nanowhiskers from bleached and milled curaua fibers. Nanowhiskers were obtained via a TEMPO system. TEM micrographies proved the fibers obtained. FTIR analysis showed characteristic peaks oxidation products for samples submitted treatment, suggesting that it effective cellulose. results show method increased crystallinity decreased degree polymerization. As thermal stability, more thermally stable than other samples. Based on our findings, use may be...
Because of local climate, a phenomenon called huaico occurs in the coastal regions Peru, configured by an alluvial flow surface runoff caused precipitation and accompanied transport solid particles. A total 24% huaicos recorded Peru from 2003 to 2019 were concentrated Department Lima alone affected 38,000 people. Thus, aim this study was use Maxent identify areas at risk department. To end, georeferenced database created that included locations these events for modeling. We used variables...