scholarly journals Manufacture of Hybrid Natural/Synthetic Fiber Woven Textiles for Use in Technical Biocomposites with Maximum Biobased Content

2019 ◽  
Vol 3 (2) ◽  
pp. 43 ◽  
Author(s):  
Madina Shamsuyeva ◽  
Jana Winkelmann ◽  
Hans-Josef Endres
Keyword(s):  
Epoxy Resin ◽  
Feasibility Study ◽  
High Performance ◽  
Mechanical Performance ◽  
Synthetic Fiber ◽  
Flexural Properties ◽  
Synthetic Fibers ◽  
Flax Fibers ◽  
Promising Solution ◽  
Biobased Content

This feasibility study investigates the flexural properties of biocomposites containing woven flax textiles (plain, twill, satin) and woven twill patterned hybrid textiles containing flax-/glass or flax-/carbon mixture for lightweight applications. Synthetic fibers are integrated as weft and flax fibers are integrated as warp yarns using a double-rapier weaving machine with a Jacquard attachment. The corresponding biocomposites are manufactured via vacuum infusion process using a biobased epoxy resin as a matrix. The manufactured biocomposites are analyzed with regard to their density and flexural properties. The results show that the use of hybrid textiles offers a promising solution for the manufacture of biocomposites with a higher biobased content and significantly improved flexural properties. Furthermore, the introduction of high-performance synthetic fibers in textiles enables the manufacture of biocomposites with an isotropic mechanical performance.

scholarly journals Manufacturing of composite materials with high environmental efficiency using epoxy resin of renewable origin and permeable light cores for vacuum-assisted infusion molding

Ingenius ◽  
2019 ◽  
pp. 62-73 ◽  
Author(s):  
Diego Lascano ◽  
Jorge Valcárcel ◽  
Rafael Balart ◽  
Luís Quiles-Carrillo ◽  
Teodomiro Boronat
Keyword(s):  
Epoxy Resin ◽  
Hybrid Composites ◽  
Flexural Properties ◽  
Basalt Fibers ◽  
Flax Fibers ◽  
Sandwich Type ◽  
Fiber Matrix Interface ◽  
Biobased Content ◽  
Agent Treatment

This work focuses on the manufacturing and characterization of novel and lightweight hybrid sandwich-type structures, using different stacking sequences of flax and basalt fabrics as reinforcement fibers, both of them previously silanized. To reduce the overall weight and facilitate the manufacturing process, a polyester non-woven core, was used which, besides reducing the weight of the composite it also acts as a media to spread the resin. These composites were manufactured with a partially bio-based epoxy resin with a reactive diluent derived from epoxidized vegetable oils that contributes to a 31 % of biobased content. The hybrid composites were obtained by vacuum-assisted resin infusion moulding (VARIM), where the core was used as a media to spread the resin. The mechanical properties were evaluated in flexural and impact conditions. The interactions in the fiber-matrix interface were studied through field emission scanning electron microscopy (FESEM). The obtained data revealed that the silane (coupling agent) treatment works better on basalt fibers than on flax fibers, resulting in superior flexural properties on structures where these fibers are present. It is noteworthy to mention that the stacking sequence of plies directly influences the flexural properties, but it does not significantly affect the energy absorbed when these composites work on impact conditions.

scholarly journals Thermal and Reliability Characterization of an Epoxy Resin-Based Double-Side Cooled Power Module

2021 ◽  
Vol 18 (3) ◽  
pp. 123-136
Author(s):  
Tzu-Hsuan Cheng ◽  
Kenji Nishiguchi ◽  
Yoshi Fukawa ◽  
B. Jayant Baliga ◽  
Subhashish Bhattacharya ◽  
...  
Keyword(s):  
Epoxy Resin ◽  
High Power ◽  
High Performance ◽  
Mechanical Performance ◽  
Resin Composite ◽  
Wide Band ◽  
Cost Effective ◽  
Power Module ◽  
Wide Band Gap ◽  
Epoxy Resin Composite

Abstract Wide-Band Gap (WBG) power devices have become a promising option for high-power applications due to the superior material properties over traditional Silicon. To not limit WBG devices’ mother nature, a rugged and high-performance power device packaging solution is necessary. This study proposes a Double-Side Cooled (DSC) 1.2 kV half-bridge power module having dual epoxy resin insulated metal substrate (eIMS) for solving convectional power module challenges and providing a cost-effective solution. The thermal performance outperforms traditional Alumina (Al2O3) Direct Bonded Copper (DBC) DSC power module due to moderate thermal conductivity (10 W/mK) and thin (120 mm) epoxy resin composite dielectric working as the IMS insulation layer. This novel organic dielectric can withstand high voltage (5 kVAC @ 120 μm) and has a Glass Transition Temperature (Tg) of 300°C, which is suitable for high-power applications. In the thermal-mechanical modeling, the organic DSC power module can pass the thermal cycling test over 1,000 cycles by optimizing the mechanical properties of the encapsulant material. In conclusion, this article not only proposes a competitive organic-based power module but also a methodology of evaluation for thermal and mechanical performance.

High-Performance Silica/Epoxy Resin Hybrid Materials Prepared by In Situ Sol-Gel Process

2011 ◽  
Vol 308-310 ◽  
pp. 804-807
Author(s):  
Jian Jiao ◽  
Liang Zou ◽  
Pan Bo Liu ◽  
Guang Li Wu
Keyword(s):  
Electron Microscopy ◽  
Heat Resistance ◽  
Epoxy Resin ◽  
Hybrid Materials ◽  
High Performance ◽  
Mechanical Performance ◽  
Sol Gel ◽  
Mechanical And Thermal Properties ◽  
In Suit ◽  
Gel Temperature

Silica/epoxy resin hybrid materials are prepared with tetraethylorthosilicate (Si(OC2H5)4, TEOS) and γ-aminoproplytriethyoxysiliane (H2N(CH2)3Si(OC2H5)3, APTES) as the silica sources, epoxy resin as the polymer matrix, by the means of in-suit sol-gel method. The dosages of TEOS and APTES in preparation of hybrid materials, and the sol-gel temperature for silica resources are discussed to make sure of the influence of the structure and properties on hybrid materials. The dispersion of Silica in the epoxy resin are examined by transmission electron microscopy (TEM).The image of fracture surfaces of hybrid materials are examined by scanning electron microscopy (SEM). The glass transmission temperatures (Tg) are tested by differential scanning calorimeter (DSC) to characterize the heat resistance of hybrid materials. The optimum mechanical performance and heat resistance for silica/epoxy resin hybrid materials are achieved with 3wt% TEOS and APTES 2wt% employed in this materials when sol-gel temperature is 60°C. In general, the mechanical and thermal properties of the hybrid materials were improved greatly as compared with the pure epoxy resin.

scholarly journals Flax fiber and its composites: An overview of water and moisture absorption impact on their performance

2018 ◽  
Vol 38 (7) ◽  
pp. 323-339 ◽  
Author(s):  
Abdul Moudood ◽  
Anisur Rahman ◽  
Andreas Öchsner ◽  
Mainul Islam ◽  
Gaston Francucci
Keyword(s):  
Moisture Absorption ◽  
Mechanical Performance ◽  
Interfacial Strength ◽  
Growth Conditions ◽  
Flax Fiber ◽  
Fiber Reinforced Composites ◽  
Reinforced Composites ◽  
Fiber Reinforced ◽  
Synthetic Fibers ◽  
Flax Fibers

Contemporary researchers have specified that natural flax fiber is comparable with synthetic fibers due to its unique physical and mechanical characteristics which have been recognized for decades. Flax fiber-reinforced composites have the potential for wide usage in sport and maritime industries, and as automotive accessories. In addition, this composite is in the development stages for future applications in the aeronautical industry. However, designing the flax composite parts is a challenging task due to the great variability in fiber properties. This is caused by many factors, including the plant origin and growth conditions, plant age, location in the stem, fibers extraction method, and the fact that there is often a non-uniform cross section of the fibers. Furthermore, the water and moisture absorption tendency of the flax fibers and their composites and the consequent detrimental effects on their mechanical performance are also major drawbacks. Fibers may soften and swell with absorbed water molecules, which could affect the performance of this bio-composite. Flax fibers’ moisture absorption propensity may lead to a deterioration of the fiber–matrix interface, weakening the interfacial strength and ultimately degrading the quality of the composite. This review represents a brief summary of the main findings of research into flax fiber reinforced composites, focusing on the challenges of its water and moisture absorption behavior on their performance.

scholarly journals Effect of Morphological Changes due to Increasing Carbon Nanoparticles Content on the Quasi-Static Mechanical Response of Epoxy Resin

Polymers ◽  
2018 ◽  
Vol 10 (10) ◽  
pp. 1106 ◽  
Author(s):  
Hamed Yazdani Nezhad ◽  
Vijay Kumar Thakur
Keyword(s):  
Epoxy Resin ◽  
Carbon Nanoparticles ◽  
High Performance ◽  
Mechanical Response ◽  
Epoxy Polymer ◽  
Mechanical Performance ◽  
Morphological Changes ◽  
Industrial Process ◽  
Weight Percentage ◽  
Low Viscosity

Mechanical failure in epoxy polymer and composites leads them to commonly be referred to as inherently brittle due to the presence of polymerization-induced microcrack and microvoids, which are barriers to high-performance applications, e.g., in aerospace structures. Numerous studies have been carried out on epoxy’s strengthening and toughening via nanomaterial reinforcement, e.g., using rubber nanoparticles in the epoxy matrix of new composite aircraft. However, extremely cautious process and functionalization steps must be taken in order to achieve high-quality dispersion and bonding, the development of which is not keeping pace with large structures applications. In this article, we report our studies on the mechanical performance of an epoxy polymer reinforced with graphite carbon nanoparticles (CNPs), and the possible effects arising from a straightforward, rapid stir-mixing technique. The CNPs were embedded in a low viscosity epoxy resin, with the CNP weight percentage (wt %) being varied between 1% and 5%. Simplified stirring embedment was selected in the interests of industrial process facilitation, and functionalization was avoided to reduce the number of parameters involved in the study. Embedment conditions and timing were held constant for all wt %. The CNP filled epoxy resin was then injected into an aluminum mold and cured under vacuum conditions at 80 °C for 12 h. A series of test specimens were then extracted from the mold, and tested under uniaxial quasi-static tension, compression, and nanoindentation. Elementary mechanical properties including failure strain, hardness, strength, and modulus were measured. The mechanical performance was improved by the incorporation of 1 and 2 wt % of CNP but was degraded by 5 wt % CNP, mainly attributed to the morphological change, including re-agglomeration, with the increasing CNP wt %. This change strongly correlated with the mechanical response in the presence of CNP, and was the major governing mechanism leading to both mechanical improvement and degradation.

scholarly journals Performance Prediction and Mix Ratio Optimization for Multielement Green High-Performance Fiber-Reinforced Cement Matrix Composite

2021 ◽  
Vol 45 (1) ◽  
pp. 59-67
Author(s):  
Zimao Peng
Keyword(s):  
Matrix Composite ◽  
High Performance ◽  
Mechanical Performance ◽  
Superior Performance ◽  
Synthetic Fiber ◽  
Cement Matrix ◽  
Fiber Reinforced ◽  
Optimal Mix ◽  
High Performance Fiber ◽  
Reinforced Cement

Green high-performance fiber-reinforced cement (GHPFRC) matrix composite is prepared by mixing matrix composites like slurry, mortar, or concrete with reinforcing materials like metal or inorganic nonmetal fiber, synthetic fiber, or natural organic fiber by a certain method. This composite is more energy-efficient, ductile, low-carbon, economic, and environmentally friendly than ordinary concrete. However, the performance of GHPFRC matrix composite has not been fully studied. The existing research only deals with the seismic performance and fire resistance of the material, failing to systematically discuss the optimal mix ratio. To solve the problem, this paper presents an optimization strategy for multielement GHPFRC matrix composite, and carries out multiple tests on its basic mechanical performance, toughness, impact resistance, shrinkage cracking, dry shrinkage performance, and durability. The test data on various indices verify the superior performance of the prepared multielement GHPFRC matrix composite. Further, the optimal mix ratio of the material was determined as: 60% cement, 30% fly ash, and 10% silica ash, with the water-cement ratio of 0.4, water reducer dosage of 1.5%, and quartz sand dosage of 500g.

Use of Natural and Synthetic Fibers as Co-Reinforcing Agents on Abrasive Wear Behavior and Flexural Strength of Wood/PVC Composites

2013 ◽  
Vol 747 ◽  
pp. 347-350 ◽  
Author(s):  
Parichat Yotkaew ◽  
Narongrit Sombatsompop ◽  
Apisit Kositchaiyong ◽  
Ekachai Wimolmala
Keyword(s):  
Wear Resistance ◽  
Carbon Fiber ◽  
Glass Fiber ◽  
Wear Behavior ◽  
Wood Flour ◽  
Synthetic Fiber ◽  
Flexural Properties ◽  
Average Particle ◽  
Synthetic Fibers ◽  
Natural Wood

ncorporations of synthetic fiber into wood polyvinyl chloride composites (WPVC) were investigated for the effect of co-reinforcing fillers on wear behavior of WPVC materials. Physical and mechanical properties of the composites were also analyzed and discussed in association with wear behavior of co-reinforced WPVC. Three different types of synthetic fibers, namely, E-glass fiber, S-glass fiber and Carbon fiber, having an average fiber length of 3 mm, were used to study the effect of type of synthetic fiber. The concentration of synthetic fiber was varied from 0-20 pph in the WPVC composites. Natural wood flour with an average particle size of less than 250 micron was introduced into the PVC compound at a fixed concentration of 40 pph to produce the WPVC composites. Various kinds of wood flour, including, Xylia Kerri Craib & Hutch (XK), Hevea Brasiliensis Linn (HB) and Mangifera Indica Linn (MI), were also studied for the influence of wood type. Wear behavior of the composites was employed by monitoring the specific wear rate at different sliding distances (2.0 and 4.0 km), using Taber wear tester. The results found that flexural properties of the composites were improved by addition of synthetic fibers. The carbon fiber-co reinforced WPVC composites showed the highest flexural properties. Among natural wood types used, the co-reinforced WPVC with HB exhibited the most improvement of flexural properties, particularly when higher loading of the synthetic fiber. It was observed that addition of synthetic fiber can enhance wear resistance of materials, the effect being more pronounced at the higher sliding distance (4 km). S-glass fiber-co reinforced WPVC with XK showed the best wear resistance property and the optimum concentration of S-glass fiber used was 10 pph.

scholarly journals Polymer/Iron-Based Layered Double Hydroxides as Multifunctional Wound Dressings

Pharmaceutics ◽  
2020 ◽  
Vol 12 (11) ◽  
pp. 1130
Author(s):  
Mariana Pires Figueiredo ◽  
Ana Borrego-Sánchez ◽  
Fátima García-Villén ◽  
Dalila Miele ◽  
Silvia Rossi ◽  
...  
Keyword(s):  
Drug Release ◽  
High Performance ◽  
Mechanical Performance ◽  
Release Kinetics ◽  
Wound Dressings ◽  
In Vitro Drug Release ◽  
Improved Performance ◽  
Double Hydroxide ◽  
Double Hydroxides

This work presents the development of multifunctional therapeutic membranes based on a high-performance block copolymer scaffold formed by polyether (PE) and polyamide (PA) units (known as PEBA) and layered double hydroxide (LDH) biomaterials, with the aim to study their uses as wound dressings. Two LDH layer compositions were employed containing Mg2+ or Zn2+, Fe3+ and Al3+ cations, intercalated with chloride anions, abbreviated as Mg-Cl or Zn-Cl, or intercalated with naproxenate (NAP) anions, abbreviated as Mg-NAP or Zn-NAP. Membranes were structurally and physically characterized, and the in vitro drug release kinetics and cytotoxicity assessed. PEBA-loading NaNAP salt particles were also prepared for comparison. Intercalated NAP anions improved LDH–polymer interaction, resulting in membranes with greater mechanical performance compared to the polymer only or to the membranes containing the Cl-LDHs. Drug release (in saline solution) was sustained for at least 8 h for all samples and release kinetics could be modulated: a slower, an intermediate and a faster NAP release were observed from membranes containing Zn-NAP, NaNAP and Mg-NAP particles, respectively. In general, cell viability was higher in the presence of Mg-LDH and the membranes presented improved performance in comparison with the powdered samples. PEBA containing Mg-NAP sample stood out among all membranes in all the evaluated aspects, thus being considered a great candidate for application as multifunctional therapeutic dressings.

scholarly journals Enhanced Tensile Strength of Monolithic Epoxy with Highly Dispersed TiO2-Graphene Nanocomposites

2021 ◽  
Vol 5 (7) ◽  
pp. 191
Author(s):  
Yanshuai Wang ◽  
Siyao Guo ◽  
Biqin Dong ◽  
Feng Xing
Keyword(s):  
Tensile Strength ◽  
Epoxy Resin ◽  
Mechanical Performance ◽  
Chemical Properties ◽  
High Mechanical Property ◽  
Graphene Nanocomposites ◽  
Highly Dispersed ◽  
Dispersion State ◽  
Physical And Chemical

The functionalization of graphene has been reported widely, showing special physical and chemical properties. However, due to the lack of surface functional groups, the poor dispersibility of graphene in solvents strongly limits its engineering applications. This paper develops a novel green “in-situ titania intercalation” method to prepare a highly dispersed graphene, which is enabled by the generation of the titania precursor between the layer of graphene at room temperature to yield titania-graphene nanocomposites (TiO2-RGO). The precursor of titania will produce amounts of nano titania between the graphene interlayers, which can effectively resist the interfacial van der Waals force of the interlamination in graphene for improved dispersion state. Such highly dispersed TiO2-RGO nanocomposites were used to modify epoxy resin. Surprisingly, significant enhancement of the mechanical performance of epoxy resin was observed when incorporating the titania-graphene nanocomposites, especially the improvements in tensile strength and elongation at break, with 75.54% and 176.61% increases at optimal usage compared to the pure epoxy, respectively. The approach presented herein is easy and economical for industry production, which can be potentially applied to the research of high mechanical property graphene/epoxy composite system.

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