Article
Polymer Science
Sarianna Palola, Farzin Javanshour, Shadi Kolahgar Azari, Vasileios Koutsos, Essi Sarlin
Summary: This study investigates how to enhance the adhesion properties between aramid fibers and matrix materials through mechanical adhesion and surface modification with nanostructures, resulting in increased interfacial shear strength. Various characterization techniques, such as Fourier transform infrared spectroscopy and scanning electron microscopy, were used to evaluate the surface morphology and failure mechanisms at the fiber-matrix interface.
Article
Materials Science, Composites
Meng Zhang, Xin Qian, Kai Ma, Hongbo Ma, Yonggang Zhang
Summary: The two-step surface treatment on high strength and high modulus carbon fibers improved the interfacial properties of polyetherketoneketone (PEKK) matrix composites. While thermoset epoxy (EP) sizing agents led to increased interlaminar shear strength (ILSS) due to hydrogen bonding, thermoplastic polyetherimide (PEI) sizing agents showed the best ILSS value in PEKK composites with HSHM-CFs.
APPLIED COMPOSITE MATERIALS
(2022)
Article
Materials Science, Ceramics
Zhuang Liu, Jason M. Meyers, Jeffrey Schindler, Frederic Sansoz, Ting Tan, Douglas G. Fletcher
Summary: This article reports direct measurements of tensile properties in Hi-Nicalon silicon carbide fibers exposed to high-temperature argon plasma, showing a 59% reduction in tensile strength compared to the virgin fibers. Fractographic characterization using scanning electron microscopy indicates that the degradation in strength is mainly caused by a reduction in fiber cross-section due to surface attack from the high-temperature argon plasma.
JOURNAL OF THE AMERICAN CERAMIC SOCIETY
(2022)
Article
Materials Science, Composites
Haoran Song, Penghua Ying, Pingping Zhu, Yexin Zhou, Zheng Zhong
Summary: In this paper, a nonlinear constitutive model is developed to describe the elastic and inelastic deformation behavior of high strength fibers under UV-radiation and mechanical loadings. The model predicts the mechanical degradation of the material and provides a theoretical basis for the development of anti-UV technology for fiber reinforced composites.
COMPOSITES SCIENCE AND TECHNOLOGY
(2023)
Article
Materials Science, Multidisciplinary
Sabine Briede, Oskars Platnieks, Anda Barkane, Igors Sivacovs, Armands Leitans, Janis Lungevics, Sergejs Gaidukovs
Summary: The modern coating market is dominated by unsustainable fossil resources such as acrylic, polyurethane, and polyester polymer resins. This study proposes the use of biobased components to produce wood coatings with improved performance properties. By using vegetable oil acrylates as a matrix and a biobased monomer called propoxylated glycerol triacrylate (GPT), the researchers were able to tailor the properties of the UV crosslinked network. The addition of GPT significantly improved the material's storage modulus, crosslink density, and glass transition temperature.
Article
Polymer Science
Lucas de Mendonca Neuba, Rai Felipe Pereira Junio, Andressa Teixeira Souza, Yago Soares Chaves, Sheron Tavares, Alexandre Alvarenga Palmeira, Sergio Neves Monteiro, Artur Camposo Pereira
Summary: Natural fibers are being increasingly used as reinforcements for polymeric matrices due to their environmental friendliness. However, their hydrophilic nature hinders their interface interaction. An alkali treatment using different concentrations and immersion times of NaOH was proposed to enhance the fiber-matrix interface. The results showed that the treatment with 3% NaOH for 48 hours exhibited better thermal stability properties and reduced wax content.
Article
Materials Science, Characterization & Testing
Xuefeng Li, Lingli Shang, Dapeng Li, Wei Wang, Shunlan Chen, Hanwen Zhong, Yiwan Huang, Shijun Long
Summary: This study developed a high-strength, strong-adhesion, and antibacterial polysaccharide-based polyelectrolyte complex (PEC) hydrogel film through physical crosslinking. The hydrogel film exhibited excellent antibacterial activity and strong adhesion to biological tissue.
Review
Plant Sciences
Shahab Iqbal, Ozge Tirpanalan-Staben, Knut Franke
Summary: This review provides an overview of existing technologies to modify the soluble dietary fiber (SDF) to insoluble dietary fiber (IDF) ratio in by-products of the food industry. The development of methods that can enhance this ratio is of great importance for improving the nutritional functionality and value of these by-products in human nutrition.
Article
Chemistry, Multidisciplinary
Kui Wang, Lu Shen, Rong Lu, Zhao Yang, Zongbao Qin
Summary: This study reports a novel strategy to enhance the interfacial property of UHMWPE fiber-reinforced composites. A biomimetic layer with abundant stacked and three-dimensional nanoparticles was formed on the fiber surface through the synergistic effect of polydopamine and 3-aminopropyltriethoxysilane. This treatment significantly improves the interfacial shear strength and wettability of the fibers.
JOURNAL OF INDUSTRIAL AND ENGINEERING CHEMISTRY
(2022)
Article
Chemistry, Applied
Jonatan R. Granborg, Svend G. Kaasgaard, Christian Janfelt
Summary: Enzymatic treatment of maize in wet-milling processes has been used to increase the yield of extracted starch and proteins by breaking down insoluble cell-wall polysaccharides. Mass spectrometry imaging (MSI) can be a useful tool for identifying reaction products and understanding enzyme performance and substrate composition in maize samples.
CARBOHYDRATE POLYMERS
(2022)
Article
Chemistry, Applied
Xiru Shao, Xin Chen, Chen Xi, Chenchen Zhan, Xiaojing Lv, Shan Jiang, Tao Zhang, Genyang Cao
Summary: This study explores a more economical and environmentally friendly dyeing technology by combining alkali treatment and dyeing process for polyimide fabrics. The results show that the dyed fabrics using the one-bath method have higher color depth and brightness compared to the traditional two-bath method, while causing less damage to the fibers.
COLORATION TECHNOLOGY
(2023)
Article
Food Science & Technology
Xiaoyong Chen, Lijun You, Yongxuan Ma, Zhengang Zhao, Viktoryia Kulikouskaya
Summary: UV/H2O2 treatment can improve the physicochemical properties of Sargassum fusiforme polysaccharides, reduce their toxicity in cells, and enhance their anti-inflammatory activity.
FOOD AND CHEMICAL TOXICOLOGY
(2021)
Article
Materials Science, Paper & Wood
Melouki Azzedine, Benyahia Azzedine, Deghfel Nadir, Farsi Chouk, Laib Nouri, Lebid Mahmoud, Addour Yakout
Summary: Researchers are increasingly interested in plant fiber reinforced composites due to their eco-friendliness, low density, low cost, and impressive mechanical properties. This study aims to improve the adhesion between the polymer matrix and plant fibers by chemically treating Alfa fibers with a 3 wt% NaOH solution. The results show that the treated fibers exhibit enhanced mechanical properties and increased crystallinity, which can contribute to the development of high-performance composites competitive with synthetic fibers.
CELLULOSE CHEMISTRY AND TECHNOLOGY
(2023)
Article
Materials Science, Textiles
Chioma E. Njoku, Joseph A. Omotoyinbo, Kenneth K. Alaneme, Michael O. Daramola
Summary: In this study, treated and untreated Urena lobata fibers were analyzed for their potential use in polymer composites. The alkaline treatment enhanced the mechanical and structural properties of the fibers by exposing more crystalline cellulose, resulting in improved performance compared to other natural fibers used in polymer matrix composites.
JOURNAL OF NATURAL FIBERS
(2022)
Article
Environmental Sciences
Heliang Pang, Xingwang Li, Huiwu Yuan, Honglin Yuan, Jinsuo Lu
Summary: This study proposed an innovative alkaline treatment to destruct the gelatinous organic matters and improve the hydraulic flushing capacity of sediments. Under optimal pH 11.0 condition, the gelatinous extracellular polymeric substance (EPS) and microbial cells were disrupted, leading to the solubilization of proteins, polysaccharides, and humus. The alkaline treatment reduced sediment adhesion and promoted particle floating, greatly improving sediment erosion and flushing capacities.
SCIENCE OF THE TOTAL ENVIRONMENT
(2023)
Article
Forestry
Andrey Pereira Acosta, Kelvin Techera Barbosa, Amanda Albertin Xavier da Silva, Darci Alberto Gatto, Rafael de Avila Delucis, Sandro Campos Amico
Summary: This study proposes a novel method, vacuum infusion process, to measure the longitudinal permeability of wood. By evaluating different woods and fluids, it is found that the permeability difference of woods is attributed to their morphological characteristics, especially the presence of axial vessels.
EUROPEAN JOURNAL OF WOOD AND WOOD PRODUCTS
(2023)
Article
Biotechnology & Applied Microbiology
Andrey P. Acosta, Rene H. Diaz, Sandro C. Amico, Rafael Beltrame, Kelvin T. Barbosa, Rafael A. Delucis, Darci A. Gatto
Summary: The objective of this study was to evaluate a two-step Pinus elliottii modification process using thermal treatment followed by vacuum-pressure treatment and polymerization with PMMA solution. The results showed that thermal modification improved the thermal stability of pine wood, and post-treatment with PMMA recovered the losses in stiffness and strength caused by thermal modification.
BIOFUELS BIOPRODUCTS & BIOREFINING-BIOFPR
(2023)
Article
Polymer Science
Joziel A. Cruz, Sandro C. Amico, Otavio Bianchi
Summary: This study focuses on the effect of aramid pulp (1 wt.%) on the equilibrium swelling, enthalpy reaction, solid viscoelastic properties, and rheokinetics of castor oil and polyether polyol blend with polymeric isocyanate. Aramid pulp increases the crosslink density and slightly restricts the swollen volume, but does not change the reaction mechanism. It also improves the orderliness of the PU structure.
JOURNAL OF POLYMER RESEARCH
(2023)
Article
Chemistry, Physical
Mohammad Rezasefat, Alessio Beligni, Claudio Sbarufatti, Sandro Campos Amico, Andrea Manes
Summary: This study investigates the impact of pre-existing damage on the low-velocity impact response of CFRP through experiments and numerical simulations. A material model based on continuum damage mechanics is developed in Abaqus/Explicit. The model is validated through finite element simulations at the single-element level and more complex models are used to simulate different specimens subjected to low-velocity impacts. The presence of pre-existing damage near the impact region results in severe changes in mechanical response, while impacts farther away from the region show similar results as those on pristine specimens.
Article
Chemistry, Physical
Eduardo Fischer Kerche, Agne Kairyte, Sylwia Czlonka, Amanda Albertin Xavier da Silva, Maikson Luiz Passaia Tonatto, Francisco Luiz Bresolin, Rafael de Avila Delucis, Sandro Campos Amico
Summary: Sandwich panels reinforced with Z-pins were manufactured using an optimized design strategy, which showed an increase in flexural stiffness compared to non-optimized designs. Numerical and experimental approaches were used to investigate the influence of optimal pin position and angle. The results demonstrated the significant contribution of optimal pin position and angle to the maximum load and flexural stiffness of the composites.
Article
Polymer Science
Eduardo Fischer Kerche, Agne Kairyte, Sylwia Czlonka, Vinicius Demetrio da Silva, Nicholas Alves Salles, Henri Stephan Schrekker, Sandro Campos Amico
Summary: In this study, four imidazolium-based ionic liquids were tested as compatibilizers for microcrystalline cellulose. The modified microcrystalline cellulose was used as reinforcements in epoxy resin to prepare biobased composites with enhanced performances. The imidazolium-based ionic liquids did not significantly modify the morphological and structural characteristics of the reinforcements, but improved the thermal stability, mechanical responses, and viscoelastic response of the composites.
Article
Materials Science, Composites
F. Fulginiti, M. Rezasefat, A. Xavier da Silva, S. C. Amico, M. Giglio, A. Manes
Summary: This paper investigates the repeated low-velocity impact response of woven S2-glass/epoxy composites. Impact tests were conducted using a drop-tower apparatus with energies ranging from 18.4 to 59.2 J. Post-mortem analysis was performed after each impact to evaluate the impact response. A damage index was used to quantify the changes in impact response due to repeated impacts. Finite element simulations considering both interlaminar and intralaminar failure modes were carried out. The results reveal a decrease in impact force and bending stiffness with the number of impacts, while impact duration and maximum central displacement increased. The shape of the damaged area was also found to be affected. The numerical results indicate that interlaminar damage primarily initiated at the interfaces during the first impact and propagated in-plane in subsequent impacts. Intralaminar damage initiated at the backside of the laminate and then propagated in-plane and through-thickness until penetration occurred.
ADVANCED COMPOSITE MATERIALS
(2023)
Article
Materials Science, Composites
Cristiano B. Azevedo, Jose Humberto S. Almeida Jr, Tales Lisboa, Leonardo G. Scherer, Axel Spickenheuer, Sandro C. Amico
Summary: This paper introduces a novel hybrid manufacturing process that combines filament winding (FW) and tailored fiber placement (TFP). The main idea is to place a TFP patch in between two filament wound layers aiming at maximizing the load transfer between the parts. The feasibility of the process is evaluated by assessing physical properties, such as density, fiber volume fraction and void content, as well as the hybrid process kinematics and error propagation. Furthermore, axial compression tests considering several unidirectional TFP patches are carried out to determine the mechanical performance of this novel procedure. Key results show low-void content and good cross-section quality, demonstrating the feasibility of the process. In addition, mass-normalized load peaks as high as 394% with respect to the reference (non-patched) cylinder were obtained.
JOURNAL OF REINFORCED PLASTICS AND COMPOSITES
(2023)
Article
Engineering, Civil
Mohammad Rezasefat, Amanda A. X. da Silva, Sandro C. Amico, Marco Giglio, Andrea Manes
Summary: This paper presents an experimental study on the repeated low-velocity impact behavior of inter-ply hybrid composites. The impacts were performed using a drop-tower apparatus following ASTM D7136 Standard. A double exponential empirical model is proposed to describe the degradation due to the repeated impacts, considering the hybridization ratio. The results show that hybridization may lead to the mitigation of repeated impact degradation, with asymmetric hybrids outperforming single-fiber laminates.
THIN-WALLED STRUCTURES
(2023)
Article
Materials Science, Textiles
Andre Flores, Amanda Albertin, Rafael de Avila Delucis, Sandro Campos Amico
Summary: The physical and mechanical performance of natural fiber composites can be adjusted by combining them with synthetic fibers. Jute fibers are cost-effective and readily available in some countries, and their usage also benefits socially marginalized individuals who rely on this plant. This study examines the impact of hybridization on the properties of jute/glass and jute/carbon laminates with polyester resin. Various laminates were created using unidirectional jute, E-glass, and carbon fabric reinforcements through vacuum infusion. Tensile, flexural, and short beam tests were conducted according to ASTM standards. The hybrid composites generally exhibited intermediate properties compared to the non-hybrid laminates comprising only two components. The mechanical properties of the hybrid composites were 50-75% lower than those of the pure glass and carbon composites, but 30-300% higher than the pure jute composite. The number of synthetic fiber layers in the hybrid laminates played a more significant role in determining the properties rather than the arrangement. Varying the number of jute fabrics allowed for the desired combination of stiffness and strength for different applications. Moreover, hybrid laminates with more synthetic fiber layers exhibited superior hygroscopic performance.
JOURNAL OF NATURAL FIBERS
(2023)
Article
Polymer Science
Andrey Pereira Acosta, Agne Kairyte, Sylwia Czlonka, Karolina Miedzinska, Arthur Behenck Aramburu, Kelvin Techera Barbosa, Sandro Campos Amico, Rafael de Avila Delucis
Summary: This study presents the development of rigid polyurethane foams filled with pine seed shells and yerba mate. Yerba mate showed good compatibility with the polyurethane system, resulting in increased mechanical and thermal properties. However, pine seed shell did not appear to be compatible and led to a decrease in mechanical properties.
Article
Construction & Building Technology
Andrey Pereira Acosta, Amanda Albertin Xavier da Silva, Rafael de Avila Delucis, Sandro Campos Amico
Summary: This study investigates the vacuum infusion processing and characterization of wood and wood-jute laminates. The insertion of jute fabrics in the laminates improves their density and strength. However, a higher number of layers in the wood/polyester laminates leads to poorer interlaminar properties.
JOURNAL OF BUILDING ENGINEERING
(2023)
Article
Materials Science, Multidisciplinary
Dayou Ma, Mohammad Rezasefat, Joziel Aparecido da Cruz, Sandro Campos Amico, Marco Giglio, Andrea Manes
Summary: The matrix has a significant effect on the impact resistance of composite materials. Replacing a brittle polymer with a more flexible one can improve impact resistance, but it poses challenges to standard testing methods. This study designs a new fixture for testing the low-velocity impact of soft composites and investigates the effect of the fixture on the mechanical performance.
Article
Engineering, Civil
Eduardo A. W. de Menezes, Tales Lisboa, Jose Humberto S. Almeida Jr, Axel Spickenheuer, Sandro C. Amico, Rogerio J. Marczak
Summary: This paper aims to unlock and understand how the winding pattern influences the mechanical behavior of filament wound cylinders under different boundary conditions. Finite element models and an original geometric approach are developed to generate the pattern. Results show that the impact of the winding pattern on the mechanical behavior decreases with an increased number of layers stacked to the cylinder.
THIN-WALLED STRUCTURES
(2023)
Article
Chemistry, Physical
Andrey Pereira Acosta, Bruno Esteves, Joziel Aparecido da Cruz, Arthur Behenck Aramburu, Agne Kairyte, Sylwia Czlonka, Dionatan Orestes Ramos, Matheus de Paula Goularte, Rafael de Avila Delucis, Darci Alberto Gatto, Sandro Campos Amico
Summary: This study aims to develop sustainable poly(furfuryl alcohol)/wood veneer prepregs and laminate composites. The prepregs and laminates were manufactured using vacuum infusion and compression molding processes, and their properties were evaluated. The results demonstrate that the produced composites have a long shelf life, excellent hydrolysis resistance, and superior mechanical properties.
