Articoli di riviste: "Polymeric composites"

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Kim, Jin Woo, Jung Ju Lee e Dong Gi Lee. "Effect of Fiber Orientation on the Tensile Strength in Fiber-Reinforced Polymeric Composite Materials". Key Engineering Materials 297-300 (novembre 2005): 2897–902. http://dx.doi.org/10.4028/www.scientific.net/kem.297-300.2897.

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The study for strength calculation of one way fiber-reinforced composites and the study measuring precisely fiber orientation distribution were presented. However, because the DB that can predict mechanical properties of composite material and fiber orientation distribution by the fiber content ratio was not constructed, we need the systematic study for that. Therefore, in this study, we investigated what effect the fiber content ratio and fiber orientation distribution have on the strength of composite sheet after making fiber reinforced polymeric composite sheet by changing fiber orientation distribution with the fiber content ratio. The result of this study will become a guide to design data of the most suitable parts design or fiber reinforced polymeric composite sheet that uses the fiber reinforced polymeric composite sheet in industry spot, because it was conducted in terms of developing products. We studied the effect the fiber orientation distribution has on tensile strength of fiber reinforced polymeric composite material and achieved this results below. We can say that the increasing range of the value of fiber reinforced polymeric composite’s tensile strength in the direction of fiber orientation is getting wider as the fiber content ratio increases. It shows that the value of fiber reinforced polymeric composite’s tensile strength in the direction of fiber orientation 90° is similar with the value of polypropylene’s intensity when fiber orientation function is J= 0.7, regardless of the fiber content ratio. Tensile strength of fiber reinforced polymeric composite is affected by the fiber orientation distribution more than by the fiber content ratio.

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OPRAN, Constantin Gheorghe, Cătălina Bivolaru e Diana Murar. "Researches Concerning Structural and Mechanical Behavior of Sandwich Composite Polymeric Products". Key Engineering Materials 498 (gennaio 2012): 151–60. http://dx.doi.org/10.4028/www.scientific.net/kem.498.151.

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The sandwich composite polymeric products have a wide utilization in various fileds like aircraft and automotive construction, load bearing structures, sports equipment, more specifically, wherever weight-saving is required. Sandwich composites polymeric products represent excellent examples of the potential offered by composite materials. The combination of two composite faces and a lightweight polystyrene core allows obtaining a high flexural stiffness with a weak mass. This paper deals with the analysis of the structural and mechanical behavior properties of the core, adhesive and faces, for sandwich composite polymeric products. There are also presented the investigation results on how different specific factors like: mechanical and structural behavior, interface between the faces and core, constant force resistance in time, the reinforcing elements (fiber glass), the polyester core do influence the machinability of sandwich composites polymeric products..

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Qi, Ben, e Michael Bannister. "Mechanical Performance of Carbon/Epoxy Composites with Embedded Polymeric Films". Key Engineering Materials 334-335 (marzo 2007): 469–72. http://dx.doi.org/10.4028/www.scientific.net/kem.334-335.469.

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This paper presents experimental results on the mechanical performance of advanced carbon/epoxy composites with embedded polymeric films. The composite laminates with polymeric films, which are potentially used as a sensor/actuator carrier for structural health monitoring applications, were investigated under various mechanical loadings including low velocity impact, single lap shear and short beam shear. The preliminary work showed that embedment of those polymeric films does not degrade, but could significantly improve, the mechanical properties of the composite laminates.

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Kim, GeunHyung, e Yuri M. Shkel. "Polymeric Composites Tailored by Electric Field". Journal of Materials Research 19, n. 4 (aprile 2004): 1164–74. http://dx.doi.org/10.1557/jmr.2004.0151.

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A solid composite of desirable microstructure can be produced by curing a liquid polymeric suspension in an electric field. Redistribution effect of the field-induced forces exceeds that of centrifugation, which is frequently employed to manufacture functionally graded materials. Moreover, unlike centrifugational sedimentation, the current approach can electrically rearrange the inclusions in targeted areas. The electric field can be employed to produce a composite having uniformly oriented structure or only modify the material in selected regions. Field-aided technology enables polymeric composites to be locally micro-tailored for a given application. Moreover, materials of literally any composition can be manipulated. In this article we present testing results for compositions of graphite and ceramic particles as well as glass fibers in epoxy. Electrical and rheological interactions of inclusions in a liquid epoxy are discussed. Measurements of tensile modulus and ultimate strength of epoxy composites having different microstructure of 10 vol% graphite, ceramic particles and glass fiber are presented.

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Lee, Hanbin, Nam Kyeun Kim, Daeseung Jung e Debes Bhattacharyya. "Flammability Characteristics and Mechanical Properties of Casein Based Polymeric Composites". Polymers 12, n. 9 (12 settembre 2020): 2078. http://dx.doi.org/10.3390/polym12092078.

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Even though casein has an intrinsic potential ability to act as a flame retardant (FR) additive, the research regarding the FR performance of casein filled polymeric composites has not been thoroughly conducted. In the present work, two commercial casein products, such as lactic casein 720 (LAC) and sodium casein 180 (SC), were chosen to investigate their effects on the performances of the polypropylene (PP) composites. The melt compounding and compression moulding processes were employed to fabricate these casein-based composites. Ammonium polyphosphate (APP) was also selected to explore its combined effects in conjunction with casein on the composite’s flammability. The cone calorimeter results showed that the addition of casein significantly reduced (66%) the peak heat release rate (PHRR) of the composite compared to that of neat PP. In particular, the combination of LAC and APP led to the formation of more compact and rigid char compared to that for SC based sample; hence, a further reduction (80%) in PHRR and self-extinguishment under a vertical burn test were accomplished. Moreover, the tensile modulus of the composite improved (23%) by the combined effects of LAC and APP. The overall research outcome has established the potential of casein as a natural protein FR reducing a polymer’s flammability.

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Kala, Shiva Kumar, e Chennakesava Reddy Alavala. "Enhancement of Mechanical and Wear Behavior of ABS/Teflon Composites". Trends in Sciences 19, n. 9 (8 aprile 2022): 3670. http://dx.doi.org/10.48048/tis.2022.3670.

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In the present investigations, Most of the engineering applications of metallic materials are replaced by polymeric based composite materials. Because of the low cost and accessible handling of polymer composite materials such as Acrylonitrile butadiene styrene (ABS) matrix materials are used to make the composites with additions of filler enhance the properties of the matrix materials. In the present study, ABS matrix material is used to make the composite materials by adding the Teflon materials. Investigations are carried out to find the enhancement of the composites' mechanical properties. Optimizing the process parameters is done to identify the composite's most optimum used to get composite with better mechanical properties. SEM analysis and wear Debris are investigated to study the microscopic surface nature and behavior of the composites.

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Lebedeva, O. V., e E. I. Sipkina. "Polymer composites and their properties". Proceedings of Universities. Applied Chemistry and Biotechnology 12, n. 2 (4 luglio 2022): 192–207. http://dx.doi.org/10.21285/2227-2925-2022-12-2-192-207.

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The review article summarizes the results of studies conducted in the field of polymer composites obtained by various methods. An important industrial activity is structured around the development of polymeric materials and composites based on them. Composite materials having a matrix comprised of a polymeric material (polymers, oligomers, copolymers) are highly numerous and diverse. They are widely used in the industry for the manufacture of vitreous, ceramic, electrically insulating coatings, as adsorbents in the treatment of wastewater from heavy metal ions, and in the production of ion-exchange membranes. Composite materials have unique properties such as a large surface area, thermal and mechanical stability, good selectivity against various contaminants, and cost-effectiveness. The review presents the physicochemical and structural characteristics of composite materials based on synthetic polymers (polymer-carbon, polymerclay composites), polymeric heterocyclic and organosilicon compounds. Used across a variety of applications, polymer-carbon and polymer-clay composites are effective in removing organic and inorganic contaminants. However, when used as adsorbents for large-scale production, they have yet to achieve optimum performance. Hybrid materials obtained by the sol-gel method deserve special attention. This method can be conveniently used to influence the composition and structure of the surface layer of such materials as adsorbents of heavy and noble metals, catalysts, membranes and sensors for applications in biological antibiosis, ion exchange catalysis, etc. Such composites are characterized by their increased mechanical strength and thermal stability, as well as offering improved thermochemical, rheological, electrical and optical properties.

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Kim, Byung Sun, e Terry F. Lehnhoff. "Polymeric Composite Tube Fabrication". Journal of Engineering Materials and Technology 117, n. 2 (1 aprile 1995): 235–37. http://dx.doi.org/10.1115/1.2804535.

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An aluminum mold was designed for fabrication of research quality composite tubes on a hot press (miniclave). This mold allows the pressure to be applied uniformly to the inner surface of a composite (prepreg tape) tube while a constant vacuum is also applied independently to the composite throughout the course of fabrication. With proper placement of stoppers and spacers inside the mold, various types of high quality unidirectional composites with fibers oriented either in the zero or 90 degree directions, respectively, were fabricated on a hot press. The mold design had less resin loss throughout fabrication compared to a conventional tubular mold. Physical and material tests have characterized the superior qualities of the resulting composite tubes.

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Majer, Zdeněk, Pavel Hutař e Zdeněk Knésl. "Crack Behaviour in Polymeric Composites: The Influence of Particle Shape". Key Engineering Materials 465 (gennaio 2011): 564–67. http://dx.doi.org/10.4028/www.scientific.net/kem.465.564.

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In this paper polymeric particulate composites are studied (especially polypropylene (PP) matrix stuffed by rigid mineral fillers). Presently, polymeric particulate composites are frequently used in many engineering applications. The composite was modeled as a three-phase continuum – matrix, interphase and particle. The properties of the particles (size, shape) have a significant effect on the global behaviour of the composite. On the basis of fracture mechanics methodology the interaction of micro-crack propagation in the matrix filled by rigid particles covered by the interphase was analyzed. The effect of the composite structure on their mechanical properties is studied here from the theoretical point of view.

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Chambers, D. L., K. A. Taylor, C. T. Wan e A. J. Emrick. "Sputtering on polymeric composites". Surface and Coatings Technology 41, n. 3 (giugno 1990): 315–23. http://dx.doi.org/10.1016/0257-8972(90)90142-y.

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Kužel, R., I. Kǐivka, J. Kubát, J. Prokeš, S. Nešpůek e C. Klason. "Multi-component polymeric composites". Synthetic Metals 67, n. 1-3 (novembre 1994): 255–61. http://dx.doi.org/10.1016/0379-6779(94)90052-3.

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Mang, Thomas, e Friedhelm Haulena. "Recycling of polymeric composites". Macromolecular Symposia 135, n. 1 (dicembre 1998): 147–56. http://dx.doi.org/10.1002/masy.19981350117.

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Zirak, Nader, Mohammadali Shirinbayan, Michael Deligant e Abbas Tcharkhtchi. "Toward Polymeric and Polymer Composites Impeller Fabrication". Polymers 14, n. 1 (28 dicembre 2021): 97. http://dx.doi.org/10.3390/polym14010097.

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Impellers are referred to as a core component of turbomachinery. The use of impellers in various applications is considered an integral part of the industry. So, increased performance and the optimization of impellers have been the center of attention of a lot of studies. In this regard, studies have been focused on the improvement of the efficiency of rotary machines through aerodynamic optimization, using high-performance materials and suitable manufacturing processes. As such, the use of polymers and polymer composites due to their lower weight when compared to metals has been the focus of studies. On the other hand, methods of the manufacturing process for polymer and polymer composite impellers such as conventional impeller manufacturing, injection molding and additive manufacturing can offer higher economic efficiency than similar metal parts. In this study, polymeric and polymer composites impellers are discussed and conclusions are drawn according to the manufacturing methods. Studies have shown promising results for the replacement of polymers and polymer composites instead of metals with respect to a suitable temperature range. In general, polymers showed a good ability to fabricate the impellers, however in more difficult working conditions considering the need for a substance with higher physical and mechanical properties necessitates the use of composite polymers. However, in some applications, the use of these materials needs further research and development.

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Jang, Daeik, Jae-Eun Park e Young-Keun Kim. "Evaluation of (CNT@CIP)-Embedded Magneto-Resistive Sensor Based on Carbon Nanotube and Carbonyl Iron Powder Polymer Composites". Polymers 14, n. 3 (28 gennaio 2022): 542. http://dx.doi.org/10.3390/polym14030542.

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The conductive polymeric composites incorporating carbon nanotube (CNT) and carbonyl iron powder (CIP) have attracted much attention for various sensor applications. In this paper, a comprehensive study of the magneto-sensing property of a CNT-CIP embedded polymer composite is conducted to implement the composite as magneto-sensors. Thus, this study experimentally investigated the magneto-sensing performances of CNT-doped polymeric composites with the addition of CIP in terms of electrical conductivity, sensitivity, repeatability, and response time. First, the CNT-CIP clusters were manufactured and their interactions were analyzed with the zeta potential measurement and SEM observation. Then, the CNT-CIP clusters were embedded into the polymeric composites for the magneto-sensing evaluations. Experiments showed that the CNT contents in the range of percolation threshold (i.e., 0.5% and 0.75%) are optimal values for sensor applications. The addition of CNT 0.5% and 0.75% resulted in a high sensitivity of 7% and a faster response time within 400 ms. Experiment evaluation confirmed a high potential of implementing CNT-CIP composite as magneto-sensors.

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Sulyman, Ebtehag, e Noaman Sulyman. "Preparation of Polymeric Composites from Polypropylene and Palm Fronds and the Study of Some of Their Physical Properties". Baghdad Science Journal 17, n. 3 (1 settembre 2020): 0772. http://dx.doi.org/10.21123/bsj.2020.17.3.0772.

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Abstract: In this study a type of polymeric composites from melting poly propylene as a basic substance with Palm fronds powder were prepared. Evaluation of polymeric composites was done by studying some of it is mechanical properties, which included:Yong modulus (E), Impact Strength (I.S), Brinell hardness (B.H) and Compression Strength (C.S). The polymeric composites were studied before and after reinforcment by comparing between them. There was an increase in resistance of Yong modulus (E), Impact Strength (I.S), Brinell hardness (B.H) and compression Strength (C.S). Also, the effect of some acids were studied such as (HCl, H2SO4, HNO3) with concentrations of (0.5N; 1N and 1.5N) respectively. The physical properties of absorbance and poly propylene's diffusion coefficient were studied before and after reinforcment, The results showed an increase in values of these properties with increasing concentration of acid and time of polymer's immersion in the acidic solution.

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Sizochenko, Natalia, e Jerzy Leszczynski. "Drug-Nanoparticle Composites". Journal of Nanotoxicology and Nanomedicine 2, n. 1 (gennaio 2017): 1–10. http://dx.doi.org/10.4018/jnn.2017010101.

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Polymeric nanoparticles represent attractive targets for the controlled delivery of therapeutic drugs. Drug-nanoparticle conjugates are convenient targets to enhance solubility and membrane permeability of drugs, prolong circulation time and minimize non-specific uptake. The behavior of drugs-loaded nanoparticles is governed by various factors. Understanding of these effects is very important for design of drug-nanoparticle systems, that could be suitable for treating the particular diseases. The aim of the current study is a complementary molecular docking followed by quantitative structure-activity relationships modeling for drugs payload on polymeric nanoparticles. Twenty-one approved drugs were considered. Docking of drugs was performed towards a simplified polymeric surface. Binding energies agreed well with the observed mass loading. Quantitative structure-activity relationships model supported this data. Effects of electronegativity and hydrophobicity were discussed. Developed model may contribute to the development of other useful nano-sized polymeric drug carriers to deliver a spectrum of therapeutic and imaging agents for medical purposes.

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IBRAHEM, REFAAY. "IMPROVEMENT OF SURFACE PROPERTIES OF CARBON FIBER REINFORCED EPOXY COMPOSITES USING SOLID LUBRICANTS DURING MACHINING PROCESSES". Journal of Engineering and Applied Sciences 10, n. 2 (2023): 1. http://dx.doi.org/10.5455/jeas.2023110107.

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Polymeric composites become the most common alternatives for traditional metallic materials for a wide range of industrial applications, in the automotive industry polymeric materials and polymeric composites replaced a huge percentage of metallic parts. Polymeric composites are light in weight, easy to form, and have a lot of other properties that are recommended for automotive and other industries. But - on the other hand- the machining of polymeric parts has restrictions and limitations because of the likelihood of damage to these parts during machining operations. Cracks, tears, fiber pull-out, softness, fracture as well as surface roughness are common examples of damage to polymeric composites while machining. The present work is concerned with measuring of surface finish and generated temperature of machined parts during the drilling of carbon fiber-reinforced composites. Reducing surface roughness and machining temperature are the objectives of this work to improve the ability of polymeric composites to be safely drilled (machined). The proposed polymeric composites consist of epoxy reinforced with carbon fiber as well as some fillers to enhance the machining properties of epoxy composites. The results show that using metallic fillers (copper powder, MoS2 powder) under selected cutting conditions remarkably improved the machinability of carbon fiber-reinforced epoxy composites.

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Zanrosso, Crissie D., Sandra M. Miranda, Batuira M. da Costa Filho, Jonathan C. Espíndola, Diego Piazza, Vítor J. P. Vilar e Marla A. Lansarin. "ZnO Polymeric Composite Films for n-Decane Removal from Air Streams in a Continuous Flow NETmix Photoreactor under UVA Light". Nanomaterials 11, n. 8 (31 luglio 2021): 1983. http://dx.doi.org/10.3390/nano11081983.

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Polymeric composite films have been explored for many photocatalytic applications, from water treatment to self-cleaning devices. Their properties, namely, thickness and porosity, are controlled mainly by the preparation conditions. However, little has been discussed on the effect of thickness and porosity of polymeric composite films for photocatalytic processes, especially in gas phase. In the present study, different preparation treatments of ZnO-based polymeric composite films and their effects on its performance and stability were investigated. The polymeric composites were prepared by solution mixing followed by non-solvent induced phase separation (NIPS), using poly(vinylidene fluoride) (PVDF) as the matrix and ZnO-based photocatalysts. Different wet thickness, photocatalyst mass, and treatments (e.g., using or not pore-forming agent and compatibilizer) were assessed. A low ZnO/PVDF ratio and higher wet thickness, together with the use of pore-forming agent and compatibilizer, proved to be a good strategy for increasing photocatalytic efficiency given the low agglomerate formation and high polymer transmittance. Nonetheless, the composites exhibited deactivation after several minutes of exposure. Characterization by XRD, FTIR-ATR, and SEM were carried out to further investigate the polymeric film treatments and stability. ZnO film was most likely deactivated due to zinc carbonate formation intensified by the polymer presence.

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Valášek, P., M. Müller e A. Proshlyakov. "Effect of sedimentation on the final hardness of polymeric particle composites". Research in Agricultural Engineering 58, No. 3 (16 agosto 2012): 92–98. http://dx.doi.org/10.17221/5/2011-rae.

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In present days composite materials are the indispensable part of many branches. They make a foray into the branch of agricultural production, where they are getting to intensive development of systems utilized e.g. at soil processing. Composites can be defined as materials which synergically combine properties of matrix and filler. One of possibilities of polymeric particle composites preparation is the application of suitable filler together with some types of epoxy resins. This application extends the usable properties of resins. For the exact definition of these materials use it is necessary to map their behaviour. In the paper the problems are described, which concern the composite hardness changes as a consequence of the filler particle sedimentation in the course of the resin curing. The composite matrix was the two-component epoxy resin and the filler were chips of materials cutting process. The use of waste filler suggests itself the ecological possibility of recycling, which should be preferred in consideration to the environment friendliness.

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Gusev, Konstantin, Vjaceslavs Gerbreders, Andrejs Ogurcovs e Vladimir Solovyev. "STRUCTURE AND MECHANICAL PROPERTIES OF POLYMERIC COMPOSITES WITH CARBON NANOTUBES". ENVIRONMENT. TECHNOLOGIES. RESOURCES. Proceedings of the International Scientific and Practical Conference 3 (20 giugno 2019): 48. http://dx.doi.org/10.17770/etr2019vol3.4052.

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Experimental investigations of single-wall carbon nanotubes (CNT) effect on the mechanical properties of polymeric composite materials based on epoxy matrix have been carried out. It has been found that addition of CNT at low concentration dramatically increases tensile strength (20 – 30 per cent growth) and Young’s modulus of the samples under study. Structure of polymeric composites with CNT was characterized by atomic force microscopy (AFM) and scanning electron microscopy (SEM). AFM images of the samples under study confirm strong interaction between polymeric matrix and nano-additives, demonstrating intimate contact between CNT and epoxy surroundings which is of great importance for composite material reinforcement. Dependences of tensile strength and those of Young’s modulus on CNT concentration are discussed using micromechanics models for nanocomposites.

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Suriani, M. J., S. M. Sapuan, C. M. Ruzaidi, J. Naveen, H. Syukriyah e M. Ziefarina. "Correlation of manufacturing defects and impact behaviors of kenaf fiber reinforced hybrid fiberglass/Kevlar polyester composite". Polimery 66, n. 1 (20 gennaio 2021): 30–35. http://dx.doi.org/10.14314/polimery.2021.1.4.

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In this study, the impact properties of kenaf fibre reinforced hybrid fiberglass/Kevlar polymeric composite was investigated. In this study, a new fiber arrangement based on kenaf bast fiber as reinforcement to the hybrid fiberglass/Kevlar fiber and polyester as matrix used to fabricate the hybrid polymeric composite. Five different types of samples with different of kenaf fiber content based on volume fraction (0, 15, 45, 60 and 75%) to hybrid fiberglass/Kevlar polymer composites were manufactured. 0% of kenaf fiber has been used as control sample. The results showed that hybridization has improved the impact properties. These results were further supported through SEM micrograph of the manufacturing defects of the polymer composite. Based on literature work, manufacturing defects that occurs in composite system reduced the mechanical properties of the material. Therefore, in this research the correlation of impact behaviors and manufacturing defects of kenaf fiber reinforced hybrid fiberglass/Kevlar polymeric composite has been successfully done. As conclusion, the highest manufacturing defects determined in the composites during the fabrication significantly lowest the results of impact behavior.

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Ouyang, Xin, Peng Cao, Weijun Zhang, Zhuofeng Liu, Zhaohui Huang e Wei Gao. "CaCu3Ti4O12–PVDF polymeric composites with enhanced capacitive energy density". International Journal of Modern Physics B 29, n. 10n11 (23 aprile 2015): 1540003. http://dx.doi.org/10.1142/s0217979215400032.

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CaCu 3 Ti 4 O 12 (CCTO)–poly(vinylidene fluoride (PVDF)) composites were prepared by melt blending and hot molding techniques. The addition of CCTO remarkably enhanced the dielectric properties and the thermal conductivity of PVDF composites, while the melting point of the PVDF composites (~170°C) was almost independent of the CCTO concentration. Based on the results of dielectric constant and dielectric breakdown voltage, the PVDF composite containing 40 vol.% CCTO fillers shows the optimized capacitive energy storage potential (7.81 J/cm3).

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Sathyanathan, M., e R. Ramesh Kumar. "Thermo-Mechanical Properties of Particulate Banana Epoxy Composite with Fruit Waste (Dragon Fruit Peel) Micro Filler for Household Applications". Journal of Biobased Materials and Bioenergy 18, n. 4 (1 luglio 2024): 537–53. http://dx.doi.org/10.1166/jbmb.2024.2400.

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This study evaluates the thermo-mechanical characteristics of eco-friendly composite made of particulate banana fiber (reinforcement), epoxy resin (matrix) and dragon fruit peel powder (micro filler). The composites were developed using compression moulding technique with 3 factors, 4 variations and Taguchi orthogonal array design (L16). The proposed filler characterization results revealed that the density was 0.97 g/cm3 and combination of C–O, Ca–O, and Ca–Co could improve mechanical strength. Composites with 5 mm fiber length, 40 wt.% fiber weight, and 15 wt.% filler weight have a maximum tensile strength of 25.58 MPa, flexural strength of 44.47 MPa, impact strength 180.33 J/m, and hardness of 82.50 SD. The best composite’s thermal, wear, water and fatigue studies were proposed to suit household applications. The proposed filler improves fiber-resin bonding, which increases thermal stability to 245 °C, wear resistance, decreases water absorption, and results in a fatigue life count of 121000 cycles. Thus, this study concluded that the increasing filler content and decreasing particulate size had an impact on the thermo-mechanical characteristics of banana-reinforced polymeric composites. As a result, an eco-friendly polymeric composite mixer coupler model was developed. Comparative structural and model analyses were performed using ANSYS R17.2. The analysis results confirmed that the proposed composite had higher natural frequencies of 2766.5 Hz and lower deformation values of 0.089293 mm. This proves the proposed eco-friendly composite is a suitable replacement for a synthetic mixer coupler.

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Зубарев, Юрий, Yuriy Zubarev, Александр Приемышев e Alexsandr Priyomyshev. "Chips formation peculiarities at polymeric composite processing". Science intensive technologies in mechanical engineering 2019, n. 8 (16 agosto 2019): 36–40. http://dx.doi.org/10.30987/article_5d2635cb77dfd6.90010587.

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A scheme of an equilibrium position of cutting force constituents at orthogonal cutting is shown and a role of each force constituent during cutting is defined. An analysis of chips formation peculiarities is presented at the edge processing of polymeric composites. The results obtained can assess potentialities of physical models at polymeric composite blank cutting.

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Saber, D., e A. H. Abdelnaby. "Recent Developments in Natural Fiber as Reinforcement in Polymeric Composites: A Review". Asian Journal of Applied Science and Technology 06, n. 03 (2022): 56–75. http://dx.doi.org/10.38177/ajast.2022.6308.

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In recent years, research on replacing manufactured fibers such as glass fibers with natural fibers as reinforcement in polymeric composites has increased rapidly. Natural fibers are an important by-product with many advantages such as abundance, biodegradability, flexibility during processing, minimal health hazards, relatively high tensile and flexural modulus, low density, low cost, and recyclability. Although natural fibers possess many advantages, as mentioned above, they suffer from some drawbacks while used in polymer matrix composites. Therefore, it is necessary to modify the fiber surface by suitable chemical treatment. The fibers had to be treated with sodium hydroxide to improve the interfacial adhesion between the fiber and the matrix, which optimized the mechanical and physical properties of these composites. Maleic anhydride was added to the composites to improve fiber composite compatibility and also to improve the properties of the composites. The main objective of this review, study the different properties of a cost-effective and eco-friendly composite material. This material consisting of natural fiber as the reinforcing component and polymeric materials as the matrix. In this review, the effects of natural fiber content, alkali treatment, and the addition of coupling agent on the composite properties were performed.

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Gao, Xingzhong, Muhammad Umair, Yasir Nawab, Zeeshan Latif, Sheraz Ahmad, Amna Siddique e Hongyue Yang. "Mode I Fatigue of Fibre Reinforced Polymeric Composites: A Review". Polymers 14, n. 21 (27 ottobre 2022): 4558. http://dx.doi.org/10.3390/polym14214558.

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Composites are macroscopic combinations of chemically dissimilar materials preferred for new high-tech applications where mechanical performance is an area of interest. Mechanical apprehensions chiefly include tensile, creep, and fatigue loadings; each loading comprises different modes. Fatigue is cyclic loading correlated with stress amplitude and the number of cycles while defining the performance of a material. Composite materials are subject to various modes of fatigue loading during service life. Such loadings cause micro invisible to severe visible damage affecting the material’s performance. Mode I fatigue crack propagates via opening lamina governing a visible tear. Recently, there has been an increasing concern about finding new ways to reduce delamination failure, a life-reducing aspect of composites. This review focuses on mode I fatigue behaviours of various preforms and factors determining failures considering different reinforcements with respect to fibres and matrix failures. Numerical modelling methods for life prediction of composites while subjected to fatigue loading are reviewed. Testing techniques used to verify the fatigue performance of composite under mode I load are also given. Approaches for composites’ life enhancement against mode I fatigue loading have also been summarized, which could aid in developing a well-rounded understanding of mode I fatigue behaviours of composites and thus help engineers to design composites with higher interlaminar strength.

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Condruz, Mihaela, Alexandru Paraschiv, Cristian Puşcaşu e Ionuţ Sebastian Vintilă. "Tensile behavior of humid aged advanced composites for helicopter external fuel tank development". MATEC Web of Conferences 145 (2018): 02004. http://dx.doi.org/10.1051/matecconf/201814502004.

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Influence of humid aging on tensile properties of two polymeric composites was studied. The purpose of the study was to evaluate the suitability of the materials for a naval helicopter external fuel tank. Due to the application, the humid environment was kerosene and saline solution to evaluate the sea water effect on the composite tensile strength. The composite samples were immersed in kerosene for 168 hours, respective 1752 hours and in saline solution for 168 hours. Tensile tests were performed after the immersion. The composite sample tensile tests showed that kerosene and saline solution had no influence on the elastic modulus of the materials, but it was observed a slight improvement of the tensile strength of the two polymeric composites.

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Ziąbka, Magdalena, e Michał Dziadek. "Surface Properties of Polymeric Composites with Silver Nanoparticles". Fibres and Textiles in Eastern Europe 26, n. 6(132) (31 dicembre 2018): 114–19. http://dx.doi.org/10.5604/01.3001.0012.5169.

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The aim of this study was to investigate the surface properties of polymeric composites and the osteoblastic cell behaviour set in direct contact with the biomaterials tested. The surface properties were evaluated before and after 6-month incubation in an in vitro environment. The composite materials were prepared by means of extrusion and injection moulding. Three commercially available thermoplastic polymers (ABS (poly)acrylonitrile butadiene styrene) were used as composite matrices. Antibacterial silver nanoparticles (AgNPs) were added as a modifying phase. Surface properties of the materials tested, such as: wettability, roughness and microstructure, were determined. Furthermore the morphology of Saos-2 human osteoblastic cells in direct contact with the composite materials was assessed after the 7-day culture. The addition of silver nanoparticles caused minor changes in the wettability and roughness values. As light modification, the silver nanoparticles influenced the microstructure. The osteoblasts displayed the proper morphology and they evenly settled on the surface of the pure polymer and composite materials, which indicated the material cytocompatibility.

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Kim, Eric S., e Patrick C. Lee. "Fabrication of Strong Self-Reinforced Polyethylene Terephthalate Composites through the In Situ Nanofibrillation Technology". Processes 11, n. 5 (9 maggio 2023): 1434. http://dx.doi.org/10.3390/pr11051434.

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Abstract (sommario):

Fabrication of self-reinforced polyethylene terephthalate (PET) has been achieved through the in situ generation of PET fibrils via a spun bond process. The reinforcement fibrils created from the PET with higher Tm are made from a unique in situ processing method. As a result, the fibrils are well dispersed and distributed in the lower Tm PET matrix. The high degree of molecular similarity affords perfect interfaces between the matrix and dispersed phase, leading to excellent stress transfer from the matrix to the dispersed fibrils. While the extremely large interfaces from the nanofibrillation process can maximize the advantage of the excellent molecular similarity of the self-reinforced polymeric composites, few studies have been conducted to research nanofibrillar self-reinforced polymeric composite systems. Hence, as a proof of concept, this work provides new insight into an approach for developing a self-reinforced polymeric system with a nanofibrillation process. This process increases the tensile strength of PET composites by up to 15% compared to composites made by a simple blending process and 47% higher than neat PET. Furthermore, extensional viscosity measurements show a strain-hardening behavior in the fibrillated PET composites not observed in the neat PET and showed minimal behavior in un-fibrillated PET composites. The foam process results reveal that the presence of PET fibrils in PET improves the expansion ratio as well as the cell density of the PET composites. Specifically, compared to the PET composite foams without the fibrillation process, fibrillated PET composite foams showed up to 3.7 times higher expansion ratios and one to two orders of magnitude higher cell densities. In thermal conductivity measurements, fibrillated PET composite foams achieved thermal conductivity of as low as 0.032 W/mK.

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30

Pinto, K. N. C., e J. L. Rossi. "Recycling of Polymeric Matrix Composites". Materials Science Forum 416-418 (febbraio 2003): 444–48. http://dx.doi.org/10.4028/www.scientific.net/msf.416-418.444.

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31

Vetrova, A. M., O. N. Klenovich, M. P. Badryzlova, A. P. Sineokov e O. G. Zhdanova. "Polymeric composites for repair purposes". Polymer Science Series C 49, n. 1 (marzo 2007): 56–59. http://dx.doi.org/10.1134/s1811238207010134.

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32

Reifsnider, K. L. "Micromechanical modelling of polymeric composites". Polymer 35, n. 23 (novembre 1994): 5035–40. http://dx.doi.org/10.1016/0032-3861(94)90660-2.

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33

Qutubuddin, S., C. S. Lin e Y. Tajuddin. "Novel polymeric composites from microemulsions". Polymer 35, n. 21 (ottobre 1994): 4606–10. http://dx.doi.org/10.1016/0032-3861(94)90810-9.

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34

Hassan, N. M., e R. C. Batra. "Modeling damage in polymeric composites". Composites Part B: Engineering 39, n. 1 (gennaio 2008): 66–82. http://dx.doi.org/10.1016/j.compositesb.2007.02.001.

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35

Song, Sangyup, Hyunaee Chun, Minsoo Joo e Nakjoong Kim. "Chromophores for Polymeric Photorefractive Composites". Molecular Crystals and Liquid Crystals Science and Technology. Section A. Molecular Crystals and Liquid Crystals 349, n. 1 (settembre 2000): 55–58. http://dx.doi.org/10.1080/10587250008024864.

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36

Luo, Xiaofan, e Patrick T. Mather. "Triple-Shape Polymeric Composites (TSPCs)". Advanced Functional Materials 20, n. 16 (1 luglio 2010): 2649–56. http://dx.doi.org/10.1002/adfm.201000052.

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37

BLEDZKI, ANDRZEJ K., STANISLAWA SPYCHAJ e ALICJA KWASEK. "Microspheres as fillers for polymeric composites. Part I. Application of microspheres to polymeric composites". Polimery 30, n. 03 (marzo 1985): 97–101. http://dx.doi.org/10.14314/polimery.1985.097.

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38

Шешин, Evgeniy Sheshin, Денисова e Lyubov Denisova. "RADIATION MODIFYING OF COMPOSITE MATERIALS IN CASE OF GAMMA IRRADIATION". Bulletin of Belgorod State Technological University named after. V. G. Shukhov 1, n. 12 (11 novembre 2016): 170–73. http://dx.doi.org/10.12737/22802.

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Abstract (sommario):

In work researches of mechanisms of radiation oxidation of polymeric composites on the basis of the lead of polystyrene (PS-SS) and polyethylene (PE-SS) filled silikanaty are conducted. In case of gamma irradiation of the filled polymeric composite to growth of an integrated dose there is an increase both concentration of radicals, and content of products of destruction. Depending on an integrated dose and type a polymeric composite also nature of accumulating of radicals changes. So for PS-SS to D = 600 кГр the alkil of R-radical to peroxide of RO2-constitutes the share relation R-/RO2-=2,50 whereas in case of an identical dose increases in PE-SS for RO2 radical (R/RO2=0,83). In case of the maximum concentration of radicals in a reaktoplasts the relation of R/RO2-even more decreases - to 0,67. It is established that in case of rather high values of capacity of a dose extreme value (at most) on dose dependence of change of concentration of macroradicals (R-and RO2-) in the researched composites won´t be shown. The nature of the arising macroradicals like R-and RO2-is closely connected as with kinetics of radical reactions in case of -radiation, and structural and mechanical, diffusive characteristics and type of a polymeric composite.

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Vinayagamoorthy, R., e T. Rajmohan. "Machining and its challenges on bio-fibre reinforced plastics: A critical review". Journal of Reinforced Plastics and Composites 37, n. 16 (23 maggio 2018): 1037–50. http://dx.doi.org/10.1177/0731684418778356.

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Abstract (sommario):

Bio-degradability and sustainability have become major objectives in the field of materials engineering. Due to this, the utilisation of natural reinforcement is gaining immense attention among composite researchers. Among the different composites, polymeric composites are used as structural components. In the present day investigations, bio-elements are majorly utilized as reinforcements due to their properties and bio-degradability. Although polymeric components are manufactured in the shape of the final component, they need secondary processing to make it suitable for assembly. Hence, a review on machining and associated investigations on bio-composites would help the composites industries and upcoming researcher to know the scope of research and for selection of apt machining conditions. This review gives a detailed insight on the various machinability factors and their measurement, influence of machining parameters on the machinability and optimum conditions during machining of bio-composites. In addition, this review also presents about the importance of bio-fibre under various situations of machining and untraditional machining methods used for bio-composites.

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Venetis, J., e E. Sideridis. "A Theoretical Consideration on the Estimation of Interphase Poisson’s Ratio for Fibrous Polymeric Composites". Journal of Applied Mathematics 2018 (1 ottobre 2018): 1–9. http://dx.doi.org/10.1155/2018/3196569.

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Abstract (sommario):

An analytical approach on the evaluation of interphase Poisson’s ratio for fibrous composites, consisting of polymeric matrix and unidirectional continuous fibers, is performed. The simulation of the microstructure of the composite was carried out by means of a modified form of Hashin-Rosen cylinder assemblage model. Next, by the use of this three-phase model the authors impose some limitations to the polynomial variation laws which are commonly adopted to approximate the thermomechanical properties of the interphase layer of this type of polymeric composites and then propose an nth-degree polynomial function to approximate the Poisson’s ratio of this layer.

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MELNYK, Liubov, Valentyn SVIDERSKYI e Lev CHERNYAK. "FEATURES OF VOLCANIC ROCKS AS MATERIALS FOR POLYMERIC COPOSITES". Herald of Khmelnytskyi National University 305, n. 1 (23 febbraio 2022): 14–19. http://dx.doi.org/10.31891/2307-5732-2022-305-1-14-19.

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Abstract (sommario):

Fillers or reinforcing components are an integral part of composite materials. A classification of composites according to structural features and fineness has been adopted. Ideas about the effect of fillers on the physical, mechanical and operational characteristics of composite materials and products have been defined and are constantly being deepened. In this regard, the use of volcanic rocks as fillers is noteworthy. The prospects for the use of certain types of volcanic rocks as disperse fillers of polymer composites are justified by their significant distribution and accumulation of fine fractions of screenings as waste during their extraction and processing. At the same time, the achievement of the effectiveness of such raw materials requires a deepening of ideas about the composition and physico-chemical properties, in the direction of which this work has been done. Physical and chemical studies in terms of evaluating the suitability of volcanic rocks (perlite, zeolite, andesite) as ingredients of polymer composite materials made it possible to obtain quantitative data on their chemical and mineralogical composition, hydrophilic-lyophilic balance and energy state of their surface. The interpretation of the obtained results concerning the potential interaction of the studied materials with polymeric binders is given taking into account the above features of their composition, structure and quantitative IR spectroscopy data in terms of structure-forming bonds Si–O–Si, S –O–Al, hydroxyl groups and adsorbed water. These features indicate the possibility of choosing volcanic rocks as fillers for polymer composites with the required lyophilic-lyophobic balance and energy state of their surface and providing an unlimited level of interaction with polymer binders as a factor in shaping the structure and properties of composites.

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42

Babu, Karthik, Oisik Das, Vigneshwaran Shanmugam, Rhoda Afriye Mensah, Michael Försth, Gabriel Sas, Ágoston Restás e Filippo Berto. "Fire Behavior of 3D-Printed Polymeric Composites". Journal of Materials Engineering and Performance 30, n. 7 (30 marzo 2021): 4745–55. http://dx.doi.org/10.1007/s11665-021-05627-1.

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Abstract (sommario):

Abstract3D printing or additive manufacturing (AM) is considered as a flexible manufacturing method with the potential for substantial innovations in fabricating geometrically complicated structured polymers, metals, and ceramics parts. Among them, polymeric composites show versatility for applications in various fields, such as constructions, microelectronics and biomedical. However, the poor resistance of these materials against fire must be considered due to their direct relation to human life conservation and safety. In this article, the recent advances in the fire behavior of 3D-printed polymeric composites are reviewed. The article describes the recently developed methods for improving the flame retardancy of 3D-printed polymeric composites. Consequently, the improvements in the fire behavior of 3D-printed polymeric materials through the change in formulation of the composites are discussed. The article is novel in the sense that it is one of the first studies to provide an overview regarding the flammability characteristics of 3D-printed polymeric materials, which will further incite research interests to render AM-based materials fire-resistant.

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43

Van der Laan, H. L., S. L. Zajdowicz, K. Kuroda, B. J. Bielajew, T. A. Davidson, J. Gardinier, D. H. Kohn et al. "Biological and Mechanical Evaluation of Novel Prototype Dental Composites". Journal of Dental Research 98, n. 1 (6 settembre 2018): 91–97. http://dx.doi.org/10.1177/0022034518795673.

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Abstract (sommario):

The breakdown of the polymeric component of contemporary composite dental restorative materials compromises their longevity, while leachable compounds from these materials have cellular consequences. Thus, a new generation of composite materials needed to be designed to have a longer service life and ensure that any leachable compounds are not harmful to appropriate cell lines. To accomplish this, we have developed concurrent thiol-ene-based polymerization and allyl sulfide–based addition-fragmentation chain transfer chemistries to afford cross-linked polymeric resins that demonstrate low shrinkage and low shrinkage stress. In the past, the filler used in dental composites mainly consisted of glass, which is biologically inert. In several of our prototype composites, we introduced fluorapatite (FA) crystals, which resemble enamel crystals and are bioactive. These novel prototype composites were benchmarked against similarly filled methacrylate-based bisphenol A diglycidyl ether dimethacrylate / triethylene glycol dimethacrylate (bisGMA/TEGDMA) composite for their cytotoxicity, mechanical properties, biofilm formation, and fluoride release. The leachables at pH 7 from all the composites were nontoxic to dental pulp stem cells. There was a trend toward an increase in total toughness of the glass-only-filled prototype composites as compared with the similarly filled bisGMA/TEGDMA composite. Other mechanical properties of the glass-only-filled prototype composites were comparable to the similarly filled bisGMA/TEGDMA composite. Incorporation of the FA reduced the mechanical properties of the prototype and bisGMA/TEGDMA composite. Biofilm mass and colony-forming units per milliliter were reduced on the glass-only-filled prototype composites as compared with the glass-only-filled bisGMA/TEGDMA composite and were significantly reduced by the addition of FA to all composites. Fluoride release at pH 7 was greatest after 24 h for the bisGMA/TEGDMA glass + FA composite as compared with the similarly filled prototypes, but overall the F- release was marginal and not at a concentration to affect bacterial metabolism.

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Kasetaite, Sigita, Jolita Ostrauskaite, Violeta Grazuleviciene, Danguole Bridziuviene e Egidija Rainosalo. "Biodegradable glycerol-based polymeric composites filled with industrial waste materials". Journal of Composite Materials 51, n. 29 (9 marzo 2017): 4029–39. http://dx.doi.org/10.1177/0021998317697809.

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Abstract (sommario):

The aim of this work was preparation and investigation of the polymeric composites from naturally occurring materials with the properties similar to those of conventional polymer composites and which can degrade to harmless substances after use. The other target of this work was to estimate the applicability of industrial waste materials as fillers in the polymeric composites and thus to offer a potential exploitation of biodegradable waste materials as an alternative to disposal. In this study, the polymeric composites were prepared by photopolymerization of glycerol diglycidyl ether and different industrial waste materials (rapeseed cake, phosphogypsum and horn meal) using a mixture of triarylsulfonium hexafluoroantimonates as photoinitiator. The effect of the amount and nature of the industrial waste materials on the kinetics of photopolymerization, values of contact angle and surface free energy, mechanical, thermal, rheological properties, swelling in water and biodegradability of the polymeric composites was studied. The incorporation of the selected industrial waste fillers into glycerol-based polymeric composites increased swelling in water, adhesiveness, biodegradability and reduced Young modulus values.

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Maoinser, Mohd Azuwan, Faiz Ahmad e Safian Sharif. "Effects of Cutting Parameters on Hole Integrity when Drilling GFRP and HFRP Composites". Advanced Materials Research 845 (dicembre 2013): 960–65. http://dx.doi.org/10.4028/www.scientific.net/amr.845.960.

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Abstract (sommario):

The demand for mechanical fastening in composite materials is increasing due to their potential in large assemblies, aerospace and automotive industries. In practice, small components are integrated into large assemblies drilling holes in composite materials. Drilling defect free holes in composite presents many challenges during part assembly and services. This study presents the effects of cutting parameters used for drilling holes in glass fiber reinforced polymeric (GFRP) composites and hybrid fiber reinforced polymeric (HFRP) composites. Both the composites plates of 3 mm thickness were fabricated using a hand lay-up technique for the purpose of evaluating the effects of parameters on the quality of drilled holes. The holes were drilled using a 5 mm solid carbide twist drill at different spindle speed and feed rate. The quality of holes was assessed with respect to damage factor (Fd) and surface roughness (Ra) of the drilled holes. Results showed that the HFRP composite experienced lower damage factor (Fd) as compared to GFRP composite at lower feed rate or spindle speed. Scanning electron microscopic (SEM) examination revealed that the occurrence of delamination, fiber pull-out and matrix cracking was accelerated in the drilled holes at high spindle speed and feed rate.

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Radzuan, Nabilah Afiqah Mohd, Abu Bakar Sulong, Anil Verma e Norhamidi Muhamad. "Layup sequence and interfacial bonding of additively manufactured polymeric composite: A brief review". Nanotechnology Reviews 10, n. 1 (1 gennaio 2021): 1853–72. http://dx.doi.org/10.1515/ntrev-2021-0116.

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Abstract (sommario):

Abstract Additively manufactured polymeric composites exhibit customised properties beyond those offered by conventionally fabricated ones. However, in many cases, the mechanical performance mainly depends on the processing parameters, tools, and material selection. Yet, one of the issues of the additive manufacturing process especially in the material extrusion process is the inability to control the printing layups, thereby causing interlaminar damage. Thus far, literature and research have focused on improving the mechanical performance of such polymeric composites by focusing on the interlaminar shear strength under a transverse load transfer. Polymeric composites prepared using the material extrusion technique namely fused deposition modelling (FDM) are discussed upon its layup sequence and orientation. This article proposes that by realising a homogenous distribution of the transverse load, the orientation and the printing direction can maximise the printed load bearing. Moreover, the layup sequence and the interlayer diffusion are key for controlling the mechanical properties of the polymeric composites. This brief review presents a comprehensive elucidation of the polymeric composites manufactured using FDM that interprets the needs of having greater load bearing in each layup printing sequence of the polymeric composites. By able to control the layup sequence, one can control the mechanical performance based on specific functionality.

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Martynyuk, G. V., e O. I. Aksimentyeva. "Features of charge transport in polymer composites polymethylmethacrylate - polyaniline". Physics and Chemistry of Solid State 21, n. 2 (15 giugno 2020): 319–24. http://dx.doi.org/10.15330/pcss.21.2.319-324.

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Abstract (sommario):

The influence of polymer matrix of polymethyl methacrylate (PMMA) on the specific conductivity, percolation threshold, energy of activation of charge transport in polymer composites PMMA − polyaniline (PAN) was studied. Concentration dependence of the electrical conductivity of composites reveals percolation behavior with the low value of percolation threshold within 2 % content of polyaniline. It is found that in the polymer composites PMMA - PAN the specific conductivity increases by more than 8−9 orders of magnitude compared to the original matrix. On the base of temperature dependence of the specific conductivity of the obtained composites, it is concluded that PMMA polymer matrix does not change the semiconductor nature of PAN conductivity in the composite but effects on the activation parameters of the charge transport. From ESR spectra, it found that the presence of a polymeric matrix causes significant delocalization of the charge along the macrochains of the dielectric polymeric matrix.

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Desai, Fenil J., M. Nizam Uddin, Muhammad M. Rahman e Ramazan Asmatulu. "Studying the properties of polymeric composites of metal hydrides and carbon particles for hydrogen storage". Journal of Management and Engineering Integration 14, n. 1 (giugno 2021): 119–27. http://dx.doi.org/10.62704/10057/24774.

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Abstract (sommario):

Metal hydrides are promising hydrogen storage materials widely studied and accepted by many authorities, but still, it has not reached the set goal. In this work, polymer-based carbon particles along with metal hydride materials are proposed as a storage medium for hydrogen. Metal hydride particles were integrated into a polymeric matrix with carbon particles to improve the thermal stability and hydrogen storage capacity. Some physical properties, morphological effects, and thermal conductivity values of the polymeric composite were investigated using X-ray diffraction (XRD), Fourier Transform Infrared Spectroscopy (FTIR), and scanning electron microscopy (SEM). The test results indicated that metal hydrides and carbon particles were well integrated into the polymeric structure, which could drastically affect the hydrogen storage capacity of the polymeric composites for applications in the transportation industry.

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Fraile-Martínez, Oscar, Cielo García-Montero, Alejandro Coca, Miguel Angel Álvarez-Mon, Jorge Monserrat, Ana M. Gómez-Lahoz, Santiago Coca et al. "Applications of Polymeric Composites in Bone Tissue Engineering and Jawbone Regeneration". Polymers 13, n. 19 (6 ottobre 2021): 3429. http://dx.doi.org/10.3390/polym13193429.

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Abstract (sommario):

Polymer-based composites are a group of biomaterials that exert synergic and combined activity. There are multiple reported uses of these composites in multiple biomedical areas, such as drug carriers, in wound dressings, and, more prominently, in tissue engineering and regenerative medicine. Bone grafting is a promising field in the use of polymeric composites, as this is the second most frequently transplanted organ in the United States. Advances in novel biomaterials, such as polymeric composites, will undoubtedly be of great aid in bone tissue engineering and regeneration. In this paper, a general view of bone structure and polymeric composites will be given, discussing the potential role of these components in bone tissue. Moreover, the most relevant jawbone and maxillofacial applications of polymeric composites will be revised in this article, collecting the main knowledge about this topic and emphasizing the need of further clinical studies in humans.

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Colomban, Philippe. "Sol-gel control of the micro/nanostructure of functional ceramic-ceramic and metal-ceramic composites". Journal of Materials Research 13, n. 4 (aprile 1998): 803–11. http://dx.doi.org/10.1557/jmr.1998.0102.

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Abstract (sommario):

The problems encountered to tailor simultaneously various specific chemical or physical properties are discussed. Selected polymeric precursors used in association with fine powders allow the control of the nano/microstructure of composites and hence the preparation of functional (FGM) and hierarchical reinforced (HRC) composites, making it possible to combine several kinds of fibers, interphases, and matrices in the same composite (hot microwave absorbent), to control the fiber/matrix interface (long life times composites), to achieve net-shape sintering of 3D composite matrices, and to prepare thick films of metal-ceramic composites with tailored microwave absorption (radar stealthiness).

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