Relevant bibliographies by topics / Nanofilled composites

Academic literature on the topic 'Nanofilled composites'

Author: Grafiati
Published: 11 March 2023

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Journal articles on the topic "Nanofilled composites"

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Hamdi, K., Z. Aboura, W. Harizi, and K. Khellil. "Improvement of the electrical conductivity of carbon fiber reinforced polymer by incorporation of nanofillers and the resulting thermal and mechanical behavior." Journal of Composite Materials 52, no. 11 (August 30, 2017): 1495–503. http://dx.doi.org/10.1177/0021998317726588.

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This work tends to characterize the effect of carbon black nanofillers on the properties of the woven carbon fiber reinforced thermoplastic polymers. First of all, composites from nanofilled Polyamide 6 resin reinforced by carbon fibers were fabricated. Scanning electron microscopy observations were performed to localize the nanoparticles and showed that particles penetrated the fiber zone. In fact, by reaching this zone, the carbon black nanofillers create a connectivity's network between fibers, which produces an easy pathway for the electrical current. It explains the noticed improvement of the electrical conductivity of the carbon black nanofilled composites. Electrical conductivity of neat matrix composite passed from 20 to 80 S/cm by adding 8 wt% of carbon black and to 140 S/cm by adding 16 wt% of the same nanofiller. The addition of nanofillers modifies the heating and cooling laws of carbon fiber reinforced polymer: the nanofilled carbon fiber reinforced polymer with 16 wt% is the most conductive so it heats less. Based on these results, the use of the composite itself as an indicator of this mechanical state might be possible. In fact, the study of the influence of a mechanical loading on the electrical properties of the composite by recording the variance of an electrical set is possible.
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Yang, Guoqing, Junda Cui, Yoshimichi Ohki, Deyi Wang, Yang Li, and Kai Tao. "Dielectric and relaxation properties of composites of epoxy resin and hyperbranched-polyester-treated nanosilica." RSC Advances 8, no. 54 (2018): 30669–77. http://dx.doi.org/10.1039/c8ra05846f.

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Angerame, D., and M. De Biasi. "Do Nanofilled/Nanohybrid Composites Allow for Better Clinical Performance of Direct Restorations Than Traditional Microhybrid Composites? A Systematic Review." Operative Dentistry 43, no. 4 (July 1, 2018): E191—E209. http://dx.doi.org/10.2341/17-212-l.

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SUMMARY This systematic review was carried out to assess the clinical effectiveness of nanofilled and nanohybrid composites used for direct restorations in comparison with microhybrid composites. The guidelines for the preferred reporting items for systematic reviews and meta-analyses were followed. A search of articles published from July 1996 to February 2017 was performed in PubMed, SciVerse Scopus, Latin American and Caribbean Health Sciences, the Scientific Electronic Library Online, and the Cochrane Library. The present review selected only randomized controlled trials comparing the clinical performance of a nanofilled or nanohybrid composite for direct restorations with that of a microhybrid composite. The research found 201 studies. Twenty-one articles fulfilled the criteria of the present review. However, the included studies were characterized by great methodological diversities. As a general trend, nanofilled and nanohybrid composites were found to be capable of clinical performance, marginal quality, and resistance to wear similar to that of traditional composites without showing improved surface characteristics. The risk of bias of included studies was judged unclear or high. The clinical performance of nanofilled/nanohybrid composites was found to be comparable to that of traditional composites in the posterior area. The data concerning anterior and cervical restorations were insufficient. With regard to the esthetic properties, there is a compelling need for studies on anterior teeth in which the operators are kept unaware of the restorative material. Nanofilled/nanohybrid composites seem to be a valid alternative to traditional microhybrid composites, and at the moment, there is low-level evidence attesting a lack of their superiority.
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Chandra, Johanna, Laksmiari Setyowati, and Setyabudi Setyabudi. "Kekasaran Permukaan Resin Komposit Nanofilled dan Nanohybrid Setelah Paparan Asap Rokok Kretek." Conservative Dentistry Journal 8, no. 1 (December 4, 2019): 30. http://dx.doi.org/10.20473/cdj.v8i1.2018.30-35.

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Background: Cigarette smoking is a public health problem that may influence physical properties of dental composites. Surface roughness is one of the physical properties of restorative materials that can influence their success. The use of nanofilled and nanohybrid composites in dentistry has substantially increased over the past few years. Purpose: The purpose of this study was to evaluate the surface roughness of nanofilled and nanohybrid composite resins exposed to kretek cigarette smoke. Methods: Twelve cylindrical specimens were prepared of each material and divided into two groups (n=6). For the control groups, the specimens were immersed in distilled water for 24 hours at 37oC and the water was renewed daily. For the experimental groups, the specimens were exposed daily to kretek cigarette smoke, then washed and stored in distilled water at 37oC. After 21 days, specimens were measured using a Surface Roughness Tester and the data was statistically analyzed. Result: Independent-T Test revealed that there were statistically significant differences in the surface roughness between control and experimental groups both nanofilled and nanohybrid, and between experimental groups nanofilled and nanohybrid. Conclusion: The exposure to kretek cigarette smoke can significantly increase the surface roughness of nanohybrid composites more than nanofilled composites.
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Setyowati, Laksmiari, S. Setyabudi, and Johanna Chandra. "Surface roughness of nanofilled and nanohybrid composite resins exposed to kretek cigarette smoke." Dental Journal (Majalah Kedokteran Gigi) 51, no. 1 (March 31, 2018): 37. http://dx.doi.org/10.20473/j.djmkg.v51.i1.p37-41.

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Background: Cigarette smoking is a public health issue that may influence the physical properties of dental composites. Surface roughness is one of the physical properties of restorative materials potentially influencing their success. The use of nanofilled and nanohybrid composites in dentistry has increased substantially over the past few years. Purpose: The purpose of this study was to evaluate the surface roughness of nanofilled and nanohybrid composite resins exposed to kretek cigarette smoke. Methods: Twelve cylindrical specimens of each material were prepared and divided into two groups (n=6). In the control groups, the specimens were immersed in distilled water for 24 hours at 37°C, with the water being renewed daily. For the experimental groups, the specimens were exposed to kretek cigarette smoke on a daily basis, then washed and soaked in distilled water at 37°C. After 21 days, the specimens were measured using a Surface Roughness Tester and the data was then statistically analyzed. Results: An Independent-T Test revealed that there were statistically significant differences in the surface roughness between the control and experimental groups of both nanofilled and nanohybrid composites, as well as between the nanofilled experimental group and the nanohybrid experimental group. Conclusion: Exposure to kretek cigarette smoke can increase the surface roughness of nanohybrid composites to a significantly greater extent than nanofilled composites.
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Dresch, W., S. Volpato, J. C. Gomes, N. R. Ribeiro, A. Reis, and A. D. Loguercio. "Clinical Evaluation of a Nanofilled Composite in Posterior Teeth: 12-month Results." Operative Dentistry 31, no. 4 (July 1, 2006): 409–17. http://dx.doi.org/10.2341/05-103.

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Goulart, Marcelo, Deisi Fátima Damin, Rafael Melara, and Andréa De Azevedo Brito Conceição. "Effect of pre-heating composites on film thickness." Journal of Research in Dentistry 1, no. 4 (December 13, 2013): 274. http://dx.doi.org/10.19177/jrd.v1e42013274-280.

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Resin composite has been suggested as a luting material for aesthetic indirect restorations and temperature affects material viscosity. Reports of film thickness from new composites are important. The aim of this study was to analyze the influence of pre-heating two resin composites on its film thickness in order to use it as a luting agent for indirect restorations (inlays and onlays). Three materials were divided into 5 groups. Two resin composites, nanofilled (Z350 XT/3MESPE) and microhybrid (Opallis/FGM), pre–heated and room temperature, and a resin cement (AllCem/FGM) were tested. Following the guidelines from ISO 4049, each material (0,05mL) was pressed under 15kg between two glass plates covered with polyester film for 180 seconds. After pressed, the material was light polymerized with a LED for 40s and the film thickness measured using a digital micrometer. When testing the groups of pre-heated resin composites the material was heated (64°C) on a specific device (CalSet/AdDent) before all procedures. Data were analyzed using t-Student, ANOVA and Tukey post hoc test (α=.05). Resin cement group showed the lower film thickness mean (28,2 µm), followed by the pre-heated microhybrid (45,3 µm). The higher values were obtained with nanofilled composite. Nanofilled room temperature group presented the highest thickness (96,1 µm). Statistical difference was found between all groups. Pre-heating influenced the film thickness of both composites. In this study a microhybrid composite showed better results among resin composite groups. Although not presenting the lower film thickness, as resin cement, some composites could be used for luting indirect restorations when heated.
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Widyaningrum, Sindy, Purwanto Agustiono, and Harsini Harsini. "Surface roughness and colour changes of nanofilled composite resin after immersion in yogurt drink." Majalah Kedokteran Gigi Indonesia 6, no. 3 (July 30, 2021): 149. http://dx.doi.org/10.22146/majkedgiind.41479.

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Nanofilled composite resin is one of restorative materials with some weaknesses, such as changes of colour and surface roughness. These weaknesses are attributed to some factors, including frequent consumption some beverages, including yoghurt drinks. This study aims to determine the effect of long immersion of nanofilled composite resin in guava yogurt drink on discoloration and changes in surface roughness. Subjects of the study were nanofilled composite resin materials (3M Filtek Z350XT shade A3) in cylindrical shape with a diameter of 10 mm and 2 mm thickness. Study was conducted by immersing nanofilled resin composites in 10 mL of guava yogurt drink at 37 °C. Twelve specimens were divided into 3 groups with immersion duration of 12 hours, 24 hours, and 36 hours. Surface roughness measurements were carried out using a profilometer Starrett SR300 surface roughness tester, while the colour measurement parameters according to the system L * a * b * was measured using chromameter Konica Minolta CR-400 before and after treatment. Data of changes in surface roughness and colour changes data (ΔE) were calculated and analysed using one-way ANOVA. The results showed insignificant surface roughness changes but significant colour changes in nanofilled composite resin in the groups of 12 hours, 24 hours, and 36 hours. It is concluded that immersion duration in guava yoghurt drink significantly affects the colour of nanofilled composite resin.
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Ozsoy, Iskender, Adullah Mimaroglu, and Huseyin Unal. "Influence of micro- and nanofiller contents on friction and wear behavior of epoxy composites." Science and Engineering of Composite Materials 24, no. 4 (July 26, 2017): 485–94. http://dx.doi.org/10.1515/secm-2014-0262.

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AbstractIn this study, the influence of micro- and nanofiller contents on the tribological performance of epoxy composites was studied. The fillers are micro-Al2O3, micro-TiO2, and micro-fly ash and nano-Al2O3, nano-TiO2, and nanoclay fillers. The microfillers were added to the epoxy by 10%, 20%, and 30% by weight. The nanofillers were added to the epoxy by 2.5%, 5%, and 10%. Friction and wear tests were conducted using the pin-on-disc arrangement. Tribo elements consisted of polymer pin and DIN 1.2344 steel counterface disc. A load value of 15 N, a sliding speed of 0.4 m/s, a sliding distance of 2000 m, and dry atmospheric conditions were applied to test conditions. The results show that the friction coefficients and the specific wear rates of the nanofilled composites increase as the filler content increases. For microfiller-filled epoxy composites, these values decrease as filler content increases. The tribological performance of epoxy composites is enhanced by the addition of microfillers, and the higher enhancement is reached with the addition of 30% fly ash filler. Finally, the pin and disc worn surface images show the presence of adhesive and some abrasive wear mechanisms.
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Tonholo, Josealdo, Roberta Alves Pinto Moura Penteado, José Ginaldo Júnior, Milton Fernando de Andrade Silva, Celso da Silva Queiroz, Vanessa Cavalli, Marcos Augusto do Rego, and Priscila Christiane Suzy Liporoni. "Evaluation of Surface Roughness of Microhybrid and Nanofilled Composites after pH-Cycling and Simulated Toothbrushing." Journal of Contemporary Dental Practice 11, no. 6 (2010): 17–24. http://dx.doi.org/10.5005/jcdp-11-6-17.

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Abstract Aim This study evaluated the surface roughness patterns of two resin-based composite restorative materials, a microhybrid (Filtek Z250, 3M ESPE) and a nanofilled (Filtek Supreme, 3M ESPE), subjected to a regimen that simulated dynamic pH-cycling and toothbrushing. Methods and Materials Twelve standardized cylindrical specimens of each resin-based composite material were prepared, finished, and mechanically polished. The experimental units were submitted to a pH-cycling regimen followed by 50,000 toothbrushing cycles, after which the surface roughness was measured using an atomic force microscope (AFM). AFM surface roughness was evaluated at three intervals: (1) immediately after specimen preparation (baseline), (2) after pH-cycling, and (3) after simulated toothbrushing. The results were then analyzed using a split-plot design and followed by linear regression and a Tukey's test at a significance level of p<0.05. Results The results obtained indicated that simulated toothbrushing provoked a remarkable increase in surface roughness for both types of composite resins tested (p=0.0031). However, pH-cycling did not alter the surface of the composite under the conditions of this experiment. Conclusions Based on the results obtained, it was concluded that simulated toothbrushing was capable of increasing the surface roughness of the microhybrid (Filtek Z250) and the nanofilled (Filtek Supreme) composites tested. Clinical Significance Surface roughness of nanofilled and microhybrid composites is significantly increased after toothbrushing, although pH-cycling, as tested in this study, does not appear to affect the morphology of either composite material. Citation Penteado RAPM, Tonholo J, Ginaldo Júnior J, Silva MFA, Queiroz CS, Cavalli V, Rego MA, Liporoni PCS. Evaluation of Surface Roughness of Microhybrid and Nanofilled Composites after pH-Cycling and Simulated Toothbrushing. J Contemp Dent Pract [Internet]. 2010 December; 11(6):017-024. Available from: http://www.thejcdp.com/journal/view/volume11- issue6-liporoni
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Dissertations / Theses on the topic "Nanofilled composites"

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Masouras, Konstantinos. "Elastic and surface properties of model nanofilled resin-composites." Thesis, University of Manchester, 2008. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.509838.

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Scotti, Nicola. "Laboratory evaluation of several nanofilled dental resin composites: mechanical and chemical properties." Doctoral thesis, Università degli studi di Trieste, 2015. http://hdl.handle.net/10077/10899.

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2013/2014
The present thesis focused on nanofilled dental resins. The first year activity focused on depth of cure analysis of nanofilled composites. The second year activity focused on hardness, depth of cure and shrinkage stress analysis of bulk fill resin composites. The third year focused on degree of conversion and hardness of nanofilled resin cements.
XXVII Ciclo
1980
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Raza, Mohsin Ali. "Carbon nanofiller-based composites for thermal interface applications." Thesis, University of Leeds, 2012. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.574596.

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Carbon nanofillers such as graphite nanoplatelets (GNPs) and vapour grown carbon nanofibres (VGCNFs) have enormous potential for developing thermal interface materials (TIMs), mainly due to their high thermal conductivity. In this project GNPs, VGCNFs and carbon black (CB) fillers were dispersed in the compliant polymer matrices, rubbery epoxy and silicone, to form composites. Mechanical mixing, dual asymmetric centrifuge speed mixing, three-roll milling or combined sonication and solvent mixing were used to produce composites. The effects of processing technique, wt.% offiller(s), particle size and silane-functionalisation of fillers on the properties of composites were studied. Composites were characterised mainly in terms of morphology, texture, thermal conductivity, electrical conductivity and mechanical properties. The interfacial thermal transport performance of carbon nanofiller/polymer composites was studied using a steady state method, with a view to their use as 'thermal interface adhesives and thermal pads. Roll milling was found to be the best method for producing composites with superior transport properties. GNP/rubbery epoxy and GNP/silicone composites produced by roll milling have thermal conductivities in the range of 1-3 W/m.K with 8-25 wt.% GNP. The thermal conductivities of the composites increase with increasing GNP loading and particle size but slightly decrease with silane-functionalisation of GNPs. Composites produced using GNPs ) synthesised (in-ho~se) via graphite, oxidation and thermal exfoliation offered improved transport properties compared to corresponding composites produced with commercial GNPs. Development of good interconnects between carbon nanofillers was found to be vital for producing composites with improved transport properties. GNP/silicone composites are more compliant materials than GNP/rubbery epoxy composites. VGCNF/rubbery epoxy composites have thermal conductivities in the range of 0.2-1.8 W/m.K with 2-40 wt.% VGCNF. VGCNFs increase the compressive strength of both rubbery epoxy and silicone without compromising their compliant nature. The thermal conductivity of CB/polymer composites reached ~O.2-0.3 W/m.K with 8-36 wt.% CB, depending upon the CB used. CB incorporation improved dispersion of GNPs in hybrid CB/GNP/rubbery epoxy composites and produced a thermal paste-type morphology. Similarly, VGCNFs improved the dispersion of GNPs in GNPNGCNF/rubbery epoxy hybrid composites but reduced the density of interconnects between GNPs. GNP/rubbery epoxy and VGCNF/rubbery epoxy composites offered the best performance as thermal interface adhesives compared to CB/rubbery epoxy and commercial thermal interface adhesive. The thermal contact resistance of the adhesives depends on their viscosity/conformability, bond line thickness, filler particle size, surface roughness of the substrate and thermal conductivity.
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SILVA, MARIANA DO NASCIMENTO. "GRAPHENE AS NANOFILLER IN COMPOSITES FOR ANTICORROSIVE PROTECTION." PONTIFÍCIA UNIVERSIDADE CATÓLICA DO RIO DE JANEIRO, 2018. http://www.maxwell.vrac.puc-rio.br/Busca_etds.php?strSecao=resultado&nrSeq=36392@1.

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PONTIFÍCIA UNIVERSIDADE CATÓLICA DO RIO DE JANEIRO
COORDENAÇÃO DE APERFEIÇOAMENTO DO PESSOAL DE ENSINO SUPERIOR
PROGRAMA DE SUPORTE À PÓS-GRADUAÇÃO DE INSTS. DE ENSINO
PROGRAMA DE SUPORTE À PÓS-GRADUAÇÃO DE INSTITUIÇÕES COMUNITÁRIAS DE ENSINO PARTICULARES
O nanocompósito estudado com função de revestimento anticorrosivo é constituído de Epóxi Novolac Tipo II aditivado com grafeno, sintetizado através do processo de esfoliação/redução do grafite empregando microondas. O sistema epóxi utilizado é composto pelos componentes: A, baseado em bisfenol F e cargas inorgânicas, e o B, endurecedor baseado em um polímero aminado. A síntese do grafeno e sua aditivação no componente A, foram realizadas pelo CTNano - UFMG. O principal objetivo desta dissertação é o estudo da aplicabilidade do nanocompósito, onde o grafeno é utilizado como aditivo complementar em matriz polimérica (epóxi), como alternativa de maximizar a proteção anticorrosiva. Foram estudadas diferentes aditivações: CR (sem aditivo), e aditivadas (0.1 por cento e 0.5 por cento). O substrato utilizado foi o aço carbono 1020, cuja superfície foi preparada com jateamento abrasivo e em seguida revestida com uma pistola de ar comprimido e com solvente para auxiliar o processo. Para avaliar a eficiência destes revestimentos foram realizados ensaios de corrosão (Célula Atlas e Ensaios Cíclicos), teste de aderência (Pull Off), medida de espessura (MEV) e rugosidade do substrato através do rugosímetro analógico e microscopia óptica. Para a dispersão do grafeno foi adicionado diglidil éter de bisfenol A (DGEBA) como um diluente. Os resultados obtidos indicaram que o grafeno apresentava boa dispersão na matriz polimérica. Concentrações de grafeno acima de 0,1 por cento em massa levam à falha da proteção anticorrosiva. Este comportamento pode estar relacionado à presença de solvente residual ou DGEBA não reagido no sistema com grafeno, além de possível atuação de grafeno agregado como ponto de tensão. O mecanismo de adesão revestimento/substrato permaneceu inalterado para todas as aditivações estudadas.
The studied nanocomposite with anticorrosive coating function is composed of Novolac Type II epoxy added with graphene, synthesized through the process of exfoliation / reduction of graphite using microwaves. The epoxy system used consists of the following components: A, based on bisphenol F and inorganic fillers, and B, hardener based on an amino polymer. The synthesis of graphene and its additivation in component A were performed by CTNano - UFMG. The main objective of this dissertation is the study of the applicability of the nanocomposite, where graphene is used as complementary additive in polymer matrix (epoxy), as an alternative to maximize anticorrosive protection. Different additives were studied: CR (without additive), and additives (0.1 percent and 0.5 percent). The substrate used was carbon steel 1020, the surface of which was prepared with abrasive blasting and then coated with a compressed air and solvent gun to aid the process. To evaluate the efficiency of these coatings were performed corrosion tests (Atlas Cell and Cyclic Tests), Pull Off test, thickness measurement (MEV) and roughness of the substrate through the analogous rugosimeter and optical microscopy. For the dispersion of graphene, diglycidyl ether of bisphenol A (DGEBA) was added as a diluent. The results indicated that graphene showed good dispersion in the polymer matrix. Concentrations of graphene above 0.1 percent by mass lead to failure of the anticorrosive protection. This behavior may be related to the presence of residual solvent or unreacted DGEBA in the graphene system, in addition to the possibility of aggregated graphene as voltage point. The coating / substrate adhesion mechanism remained unchanged for all additives studied.
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Xiang, Dong. "Processing and properties of melt processed high density polyethylene-carbon nanofiller composites." Thesis, Queen's University Belfast, 2015. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.676504.

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The main aim of this work was to investigate the process-structure-property relationship of high density polyethylene (HOPE)/carbon nanofiller composites. A secondary aim was to develop thin thermoplastic films with enhanced electrical and mechanical properties for the potential use in aerospace applications. Three types of carbon nanofillers with different dimensions, multi-walled carbon nanotubes (MWCNTs), graphite nanoplatelets (GNPs) and carbon black (CB) respectively, were used to reinforce the polymer matrix. The melt-mixed HOPE/carbon nanofiller composites were processed by compression moulding, biaxial stretching and blown film extrusion, and the structure and properties of the resulting composites were characterised. The crystallinity and melting temperature of the material are barely influenced by the addition of carbon nanofillers, while the crystallization temperature is slightly increased due to a heterogeneous nucleation effect. The incorporation of carbon nanofillers has a positive effect on the modulus of the composites studied and a negative effect on the stress at break and strain at break. The relative effectiveness of generating rheological and conductive networks in the polymer is as follows: GNPs < CB < MWCNTs. The inclusion of carbon nanofillers led to significant strain hardening during the biaxial stretching of the material. The carbon nanofillers were further dispersed in the matrix by biaxial stretching. The mechanical properties of all the HOPE/carbon nanofiller composites were clearly improved after biaxial stretching. However, the volume resistivity of biaxially stretched HOPE/carbon nanofiller composites, at loadings lower than 4 wt%, was increased due to the deagglomeration of nanofillers and increased inter-particle distance. Blown films of the HOPE/MWCNT composites were manufactured at blow-up-ratios (BURs) of 2 to 3. The stress at break and strain at break of the composite films increases steadily with increasing BURs. Blown film extrusion also has a destructive effect on the conductive network of MWCNTs. However, there is no significant increase in the resistivity of the composite containing 8 wt% MWCNTs after film blowing at increasing BURs due to a sufficient density of nanotubes forming a robust conductive network .
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Kelnar, I. "Polymer-polymer Microfibrillar Composites: Effect of Nanofillers on Structure and Properties." Thesis, Sumy State University, 2013. http://essuir.sumdu.edu.ua/handle/123456789/35451.

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Microfibrillar composites (MFCs) are advantageous polymer-polymer composites with in situ formed reinforcing fibrils. The range of applications of MFCs is limited by their low thermal resistance and me-chanical parameters of polymeric microfibres, which are formed by melt or cold drawing of the polymer blend. This study addresses improving MFCs based on HDPE matrix with 20% polyamide 6 microfibrils using organophilized montmorillonite. The complex effect of the nanofiller on the structure and parameters of the MFCs is investigated. When you are citing the document, use the following link http://essuir.sumdu.edu.ua/handle/123456789/35451
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Lutz, Vincent. "Carbon nanotubes as nanofillers or fibers for multifunctional epoxy-based composites." Thesis, Lyon, INSA, 2014. http://www.theses.fr/2014ISAL0039.

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L’utilisation de composites à matrice thermodurcissable et fibres continues est en constante progression dans le secteur aéronautique, ferroviaire, et automobile. Afin d’améliorer les composites obtenus, notamment leur résistance à l’impact et leur conductivité électrique, des nanocharges organiques ou inorganiques peuvent être ajoutées. Les nanotubes de carbone (CNT) font partie des candidats les plus prometteurs pour le renforcement de composites à multi-échelle. Cependant, il s’avère difficile de contrôler la dispersion, la répartition et l’orientation des CNT, après les avoir mélangés aux prépolymères. Une nouvelle stratégie d’insertion des CNT dans un composite consiste à combiner des fibres de CNT avec des fibres de carbone. L’orientation et l’organisation structurelle des CNT au sein de la fibre permettent d’obtenir d’excellentes propriétés mécaniques et électriques. Dans notre étude, les propriétés de fibres contenant exclusivement des CNT, obtenues par direct spinning, ont été comparées à celles de fibres de carbone (non-ensimées, ensimées, et CNT en surface). Différentes interfaces entre les fibres de CNT, fibres de carbone et deux types de matrices époxy (de TG très différentes) ont été générées et testées par des essais de fragmentation de fibre dans la matrice. La contrainte de cisaillement interfaciale fibre/matrice a été évaluée afin de déterminer l’influence des diverses fibres et ensimages sur les performances mécaniques de composites à matrice organique et à fibres continues. En outre, la nature de l’adhésion et la qualité de l’interphase entre la matrice et la fibre ont été caractérisées par plusieurs techniques d’analyses et d’observations à multi-échelles
Nowadays, polymer-matrix composites reinforced with carbon fibers are increasingly used in the whole transport sector (aerospace, automotive and railway industries). However, the obtained parts still suffer from low impact resistance and low damage tolerance. To improve these properties, the matrix precursors have to be combined with organic or inorganic compounds to lead to multi-phased matrices. Among them, carbon nanotubes (CNT) are especially promising for targeting multi-scale reinforcement. Since high quality of the parts are required, continuous-fibers-reinforced composites can be produced by resin transfer molding (RTM) which also offers a reduced cost if compared with high temperature- and high pressure-based processes. However, RTM requires a very low viscosity of the polymer precursors and CNT-filled precursors are far too viscous to be injected on dry performs. In addition, this strategy does not allow for a control of the CNT location and orientation in the final part. In this study, innovative ways have been developed to insert CNT in the preform with local positioning and defined orientation. Deliveries of CNT in the matrix, from a neat carbon multi-nanotubes fiber produced by direct spinning, or from a CNT grown on carbon fiber were investigated in two types of epoxy matrices (with very different TG). Different polymer matrix/fiber interfaces have been generated using neat carbon multi-nanotubes fiber, CNT grown on carbon fiber and conventional carbon fiber, with or without sizing. A fine mechanical characterization of various fibers and particularly the measurement of single fiber interfacial properties have been performed in order to determine mechanical performance of continuous fiber reinforced composites. In addition, the nature of adhesion and quality of matrix/fiber interface have been fully evaluated by different multi-scale analyses and suitable microstructural observations
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LASIO, BARBARA. "Fabrication of Cu-based metal matrix composites reinforced with carbon nanofillers." Doctoral thesis, Università degli Studi di Cagliari, 2019. http://hdl.handle.net/11584/260760.

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The thesis takes inspiration from the worldwide issues related to the shortage of critical raw materials (CRMs) and the need of finding sustainable alternatives to CRMs within fields and sectors strategic to the well-being and economy of industrialized countries. The research activity has been focused on the fabrication of Cu-matrix composites reinforced with carbon nanofillers, nano-graphite and graphene in particular. This class of composites attracts considerable interest as a consequence of the broad spectrum of applications Cu-MCs could find due to their thermal and electric conductivities, self-lubricating properties of graphite, cost-effectiveness and availability. Ball milling (BM) and spark plasma sintering (SPS) have been combined to provide an innovative methodology to fabricate Cu-MCs reinforced with carbon nanofillers enabling the fine dispersion of nanoparticles into the Cu matrix. Specifically, a two-stage cycle involving BM first and, then, SPS has been shown to result in the dispersion of graphite particles in relatively large Cu grains. The iteration of cycles allows the refinement of graphite nanoparticles and their dispersion in Cu powders on the microscopic scale, mostly at grain boundaries, and the subsequent incorporation of nanoparticles into Cu grains due to grain growth mechanisms activated and promoted by high temperatures during SPS. Molecular level mixing has been also tested to obtain Cu-MCs reinforced with graphene starting from liquid solutions of Cu nanoparticles and graphene. In particular, graphene was dispersed during the redox synthesis to obtain Cu nanopowder, subsequently consolidated by SPS. Despite the intrinsic different between the two methods, it has been possible to prepare Cu-MCs with graphite nanoparticles and graphene as dispersoids. Structural and microstructural characterization indicate that dispersoids are finely dispersed into the Cu matrix. Nanoindentation measurements clearly demonstrate the significant enhancement of mechanical properties, thus providing an important clue to the validity of the methodology developed.
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Wang, X., Q. Zheng, S. Dong, Ashraf F. Ashour, and B. Han. "Interfacial characteristics of nano-engineered concrete composites." Elsevier, 2020. http://hdl.handle.net/10454/17954.

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Yes
This study investigates the interfacial characteristics between aggregates and cement paste matrix in nanofillers modified concrete. A three-point bend test on the specimens composed of two pieces of aggregates bonded with a thin layer of cement pastes with/without nanofillers was carried out to characterize the interfacial bond strength of the composites. The scanning electron microscope observations and energy dispersive x-ray spectrometry analysis were also performed to characterize the interfacial microstructures and compositions of the composites. The experimental results indicated that the nanocomposites have higher interfacial bond strength and narrower interfacial transition zone thickness as well as more optimized intrinsic compositions and microstructures than that of composites without nanofillers. Specifically, the interfacial bond strength of nanocomposites can reach 7.67 MPa, which is 3.03 MPa/65.3% higher than that of composites without nanofillers. The interfacial transition zone thickness of nanocomposites ranges from 9 μm to 12 μm, while that of composites without nanofillers is about 18 μm. The ratio of CaO to SiO2 in the interface of composites without nanofillers is 0.69, and that of nanocomposites increases to 0.75–1.12. Meanwhile, the nanofiller content in nanocomposite interface is 1.65–1.98 times more than that in the bulk matrix. The interfacial microstructures of nanocomposites are more compact and the content and crystal size of calcium hydroxide were significantly reduced compared with that of composites without nanofillers.
The National Science Foundation of China (51978127 and 51908103), and the China Postdoctoral Science Foundation (2019M651116).
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Jumahat, Aidah. "Effect of nanofillers on thermo-mechanical properties of polymers and composite laminates." Thesis, University of Sheffield, 2011. http://etheses.whiterose.ac.uk/12875/.

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Carbon fibre reinforced polymer (CFRP) composites are high performance materials which are widely used in various applications, such as aircraft and aerospace structures, satellites, advanced marine vessels, fuel tanks, sports equipment, high-end automobile structures and many other strength/weight critical applications. It is well known that CFRP composites are stronger in tension (in the fibre direction) than in compression, typically 30-40% higher. This is due to the fact that the compressive strength depends on the properties of the matrix and quality of the laminate, such as alignment of the fibres embedded in the matrix and void content. In theory, stiffer, stronger and tougher matrices provide better support to the carbon fibres (better resistance to fibre instability or microbuckling), hence enhancing the compressive properties of the CFRP composites. The aim of this study is to improve the properties of the CFRP composite by carefully selecting and incorporating nanofillers in the epoxy resin. The nanomodified-epoxy is then combined with continuous carbon fibres, which results in better overall structural response. The thesis is made up of two main parts i.e., examination of the thermal and mechanical properties of nanomodified-epoxies and investigation of mechanical properties of the nanofilled-CFRP composite with an emphasis on compressive behaviour. In the first part, a systematic experimental investigation is conducted in order to identify the optimum content and dispersion of nanofillers in the resin systems to be used in the fabrication of CFRP composite laminates. The effect of silica nanospheres, carbon nanotubes and clay nanoplatelets on the compressive, tensile, flexural and fracture toughness properties of epoxy polymers were studied. Two types of epoxy resin were used: Epikote 828 and Cycom 977-20. In addition, the thermal properties of the nanomodified-epoxies compared to the neat systems were also investigated. The results showed that the addition of nanosilica into the epoxy significantly enhanced the compressive, tensile and flexural moduli. Additionally, strength and fracture toughness properties were also improved without any significant reduction in failure strain and thermal properties of the epoxy. It was found that the mechanical performance of nanosilica-modified Epikote 828 system was comparable to that of the commercial high-performance Cycom 977-20 polymer. The Halpin-Tsai model was modified to include the effect of particle volume fraction on the shape factor ~ that appears in the equation for predicting the Young's modulus of the nanoreinforced-resin. In the second part of the investigation, the effect of nanosilica on the compressive and in-plane shear properties of HTS40/828 CFRP composite was studied. A number of [O]s and [±45b laminates were fabricated using dry filament winding, wet resin impregnation and vacuum bagging techniques. The quality of the laminate such as fibre distribution, fibre misalignment, void content, fibre and nanosilica volume fraction was examined and measured. Static uniaxial compression and tensile tests on [O]s and [±45b laminates were performed. It was found that the compressive and in-plane shear properties of nanomodified CFRP were better than the neat system. For example, the addition of 7 vol% nanosilica improved the unidirectional (UD) compressive modulus and strength of the HTS40/828 composite by 40% and 54%, respectively. The compressive strength was also predicted using several analytical models based on fibre micro buckling and fibre kinking fracture mechanisms. One of the existing fibre microbuckling models was modified in this work to better account for the non-linear resin response. The predicted values showed that the UD nanomodified-FRP laminate exhibited a better compressive strength compared to that of the neat composite system. In addition, the results demonstrated that the performance of the nanosilica-filled HTS40/828 composite was comparable to that of the commercially available HTS40/977-2 system, which is currently used by the aircraft industry.
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Books on the topic "Nanofilled composites"

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Tjong, Sie Chin. Polymer Composites with Carbonaceous Nanofillers. Weinheim, Germany: Wiley-VCH Verlag GmbH & Co. KGaA, 2012. http://dx.doi.org/10.1002/9783527648726.

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Tjong, Sie Chin. Polymer Composites with Carbonaceous Nanofillers: Properties and Applications. Wiley & Sons, Incorporated, John, 2012.

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Tjong, Sie Chin. Polymer Composites with Carbonaceous Nanofillers: Properties and Applications. Wiley & Sons, Incorporated, John, 2012.

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Tjong, Sie Chin. Polymer Composites with Carbonaceous Nanofillers: Properties and Applications. Wiley & Sons, Limited, John, 2012.

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Tjong, Sie Chin. Polymer Composites with Carbonaceous Nanofillers: Properties and Applications. Wiley & Sons, Incorporated, John, 2012.

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Polymer Composites With Carbonaceous Nanofillers Propterties And Applications. Wiley-VCH Verlag GmbH, 2012.

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7

Nurazzi, N. M., A. Khalina, S. M. Sapuan, and R. A. Ilyas. Synthetic and Natural Nanofillers in Polymer Composites: Properties and Applications. Elsevier Science & Technology, 2023.

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Nurazzi, N. M., A. Khalina, S. M. Sapuan, and R. A. Ilyas. Synthetic and Natural Nanofillers in Polymer Composites: Properties and Applications. Elsevier Science & Technology, 2023.

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Book chapters on the topic "Nanofilled composites"

1

Rothon, Roger. "Nanofillers." In Polymers and Polymeric Composites: A Reference Series, 1–21. Berlin, Heidelberg: Springer Berlin Heidelberg, 2016. http://dx.doi.org/10.1007/978-3-642-37179-0_78-1.

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Boonmahitthisud, Anyaporn, Anyaporn Boonmahitthisud, Saowaroj Chuayjuljit, and Takaomi Kobayashi. "Encapsulation of Inorganic Renewable Nanofiller." In Handbook of Composites from Renewable Materials, 143–64. Hoboken, NJ, USA: John Wiley & Sons, Inc., 2017. http://dx.doi.org/10.1002/9781119441632.ch68.

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Ghose, Subrata, K. A. Watson, D. M. Delozier, D. C. Working, John W. Connell, J. G. Smith, Y. P. Sun, and Y. Lin. "Thermal Conductivity of Polyimide/Carbon Nanofiller Blends." In Advances in Composite Materials and Structures, 749–52. Stafa: Trans Tech Publications Ltd., 2007. http://dx.doi.org/10.4028/0-87849-427-8.749.

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Parihar, Vijay Singh, Ankit Baranwal, Vikas Gautam, Shikhar Bajpai, Anurag Gupta, and K. L. A. Khan. "A Review of Nanofiller Coating on FRP Composites." In Lecture Notes in Mechanical Engineering, 419–25. Singapore: Springer Singapore, 2020. http://dx.doi.org/10.1007/978-981-15-8704-7_52.

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Bhat, A. H., Imran Khan, Mohd Amil Usmani, and Jahangir Ahmad Rather. "Bioplastics and Bionanocomposites Based on Nanoclays and Other Nanofillers." In Nanoclay Reinforced Polymer Composites, 115–39. Singapore: Springer Singapore, 2016. http://dx.doi.org/10.1007/978-981-10-1953-1_5.

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Nguyen, Dang Mao, Patrick Perré, Thi Phuong Thao Nguyen, Quoc Bao Bui, and DongQuy Hoang. "Recent Advances in Nanofillers for Multidisciplinary Applications of Polymer Nanocomposites." In Mineral-Filled Polymer Composites, 67–99. Boca Raton: CRC Press, 2021. http://dx.doi.org/10.1201/9781003221012-4.

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Han, Wei, Youhong Tang, and Lin Ye. "Carbon Fibre-Reinforced Polymer Laminates with Nanofiller-Enhanced Multifunctionality." In The Structural Integrity of Carbon Fiber Composites, 171–97. Cham: Springer International Publishing, 2016. http://dx.doi.org/10.1007/978-3-319-46120-5_8.

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Zadeh, Khadija, Sadiya Waseem, Kishor Kumar Sadasivuni, Kalim Deshmukh, Aqib Muzaffar, M. Basheer Ahamed, and Mariam Al-Ali AlMaadeed. "Processing and Industrial Applications of Sustainable Nanocomposites Containing Nanofillers." In Sustainable Polymer Composites and Nanocomposites, 451–78. Cham: Springer International Publishing, 2019. http://dx.doi.org/10.1007/978-3-030-05399-4_17.

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Bansal, Tanmay, Suraj Malik, Tushar Batra, Munna Shah, Anurag Gupta, and K. L. A. Khan. "Review of Effect of Nanofillers on FRP Composites." In Lecture Notes in Mechanical Engineering, 411–17. Singapore: Springer Singapore, 2020. http://dx.doi.org/10.1007/978-981-15-8704-7_51.

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Jastrzębska, M., and M. Rutkowska. "Water Sorption in Polyester/Dust/Glass Polyester Recyclate Composites with Nanofillers." In Advanced Materials, Polymers, and Composites, 183–91. New York: Apple Academic Press, 2021. http://dx.doi.org/10.1201/9781003105015-13.

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Conference papers on the topic "Nanofilled composites"

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Abdel Hamid, Dalia, Amal Esawi, Inas Sami, and Randa Elsalawy. "Characterization of Nano- and Micro-Filled Resin Composites Used as Dental Restorative Materials." In ASME 2008 2nd Multifunctional Nanocomposites and Nanomaterials International Conference. ASMEDC, 2008. http://dx.doi.org/10.1115/mn2008-47053.

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Adhesively-bonded resin composites have the advantage of conserving sound tooth structure with the potential for tooth reinforcement, while at the same time providing an aesthetically acceptable restoration. However, no composite material has been able to meet both the functional needs of posterior restorations and the superior aesthetics required for anterior restoration. In an attempt to develop a dental resin composite that had the mechanical strength of hybrid composite materials and the superior polish and gloss retention associated with microfilled materials, nanofilled resin composites have been introduced in the market. Although nanofillers are the most popular fillers utilized in current visible light-activated dental resin composites and are claimed to be the solution for the most challenging material limitations as a universal restorative material, the mechanisms by which these fillers influence the resin composite properties are not well explained. In this study, some physical and mechanical properties of a nanofilled resin composite containing 60 vol. % zirconia and silica fillers were evaluated and compared to those of a microhybrid resin composite of the same composition. The nanofilled resin composite was found to have equivalent polymerization shrinkage and depth of cure to the microhybrid material but a slightly lower degree of conversion and density. Regarding mechanical behaviour, although the nanocomposite was found to exhibit significantly higher wear resistance, and equivalent flexural strength, its indentation modulus and nanohardness were slightly lower. Field-emission scanning electron microscopy (FE-SEM) analysis was conducted in order to evaluate the microstructure and to obtain a better understanding of the effect of the nanofillers on the behaviour of the nanocomposite.
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Guadagno, Liberata, Umberto Vietri, Maria Sarno, Marialuigia Raimondo, Claudia Cirillo, and Paolo Ciambelli. "Nanofilled epoxy adhesives for structural applications." In TIMES OF POLYMERS (TOP) AND COMPOSITES 2014: Proceedings of the 7th International Conference on Times of Polymers (TOP) and Composites. AIP Publishing LLC, 2014. http://dx.doi.org/10.1063/1.4876860.

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Greco, Antonio, Francesca Lionetto, and Alfonso Maffezzoli. "Nanofilled polyethylene terephthalate fibers for the production of hierarchical polymer based composites." In 2015 1st Workshop on Nanotechnology in Instrumentation and Measurement (NANOFIM). IEEE, 2015. http://dx.doi.org/10.1109/nanofim.2015.8425364.

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Bian, Shanshan, Shesha H. Jayaram, and Edward A. Cherney. "Improvements to the erosion resistance of nanofilled silicone rubber composites by electrospinning." In 2012 IEEE Conference on Electrical Insulation and Dielectric Phenomena - (CEIDP 2012). IEEE, 2012. http://dx.doi.org/10.1109/ceidp.2012.6378887.

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Tiano, Thomas, Margaret Roylance, Benjamin Harrison, and Richard Czerw. "Intralaminar Reinforcement for Biomimetic Toughening of Bismaleimide Composites Using Nanostructured Materials." In ASME 2005 International Mechanical Engineering Congress and Exposition. ASMEDC, 2005. http://dx.doi.org/10.1115/imece2005-81689.

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Many conventional composite materials are composed of multiple layers of continuous fiber reinforced resin produced by lamination of b-staged prepreg and subsequent cure. These materials exhibit very high strength and stiffness in the plane, dominated by the properties of the fibers. The Achilles heel of such composites is the interlaminar strength, which is dependent on the strength of the unreinforced resin, often leading to failure by delamination under load. Current methods for increasing the interlaminar shear strength of composites consist of inserting translaminar reinforcement fibers through the entire thickness of a laminated composite, such as z-pin technology developed by Foster-Miller [1]. While effective, this technique adds several processing steps, including ultrasonic insertion of the z-pins into the laminate, subsequently causing a significant cost increase to laminated composites. Described in this paper is a process utilizing single-walled carbon nanotubes (SWNTs) and vapor grown carbon nanofibers as reinforcing elements promoting interlaminar shear strength and toughness in carbon fiber/bismaleimide (BMI) resin composites. The resulting composites mimic the natural reinforcing mechanism utilized in insect cuticles. Three different methods of increasing the affinity of these carbon nanofillers for the BMI matrix were explored. The mechanical properties of these composites were assessed using end notch flexure testing. The results indicated that including nanofiller at the laminae interface could increase the interlaminar shear strength of carbon fiber/BMI composites by up to 58%. SEM micrographs revealed that the nanofiller successfully bridged the laminae of the composite, thus biomimicking the insect cuticle. Composite fabrication techniques developed on this program would have a wide variety of applications in space and aerospace structures including leading and trailing edges of aircraft wings.
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Ghose, Sayata, Kent A. Watson, Holly A. Elliott, Dennis C. Working, Jim M. Criss, Kenneth L. Dudley, Emilie J. Siochi, and John W. Connell. "Fabrication and Characterization of High Temperature Resin/Carbon Nanofiller Composites." In ASME 2006 Multifunctional Nanocomposites International Conference. ASMEDC, 2006. http://dx.doi.org/10.1115/mn2006-17016.

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As part of ongoing efforts to develop multifunctional advanced composites, blends of PETI-330 with multi-walled carbon nanotubes (MWCNTs) and carbon nanofibers (CNF) were prepared and characterized. The effect of nanofiller loading level on melt viscosity was determined. The resulting powders were characterized for degree of mixing, thermal, and rheological properties. Select samples were scaled up for processing and continuous strands of nanocomposites were extruded. Based on the characterization results, samples containing 10 and 15 wt% MWCNT and 30 and 40 wt% CNF were scaled up to ∼300 g and used to fabricate moldings 10.2 cm × 15.2 cm × 0.32 cm in size. The moldings were fabricated by injecting the mixtures at 260–280 °C into a stainless steel tool followed by curing for 1 h at 371 °C. The tool was designed to impart substantial shear during the injection process in an attempt to achieve some alignment of nanofillers in the flow direction. Moldings were obtained that were subsequently characterized for thermal, mechanical, electrical and EMI shielding properties. The degree of dispersion and alignment of nanofillers were investigated using high-resolution scanning electron microscopy. Preparation and preliminary characterization of PETI-330/MWCNT and PETI-330/CNF composites will be discussed.
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KARIMI, POUYAN, SOHAN KALE, FERESHTEH A. SABET, MARTIN OSTOJA-STARZEWSKI, and IWONA JASIUK. "Nanofiller Geometry Effects on Electrical Properties of Composites." In American Society for Composites 2017. Lancaster, PA: DEStech Publications, Inc., 2017. http://dx.doi.org/10.12783/asc2017/15345.

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I. Mourad, Abdel-Hamid, Mouza S. Al Mansoori, Lamia A. Al Marzooqi, Farah A. Genena, and Nizamudeen Cherupurakal. "Optimization of Curing Conditions and Nanofiller Incorporation for Production of High Performance Laminated Kevlar/Epoxy Nanocomposites." In ASME 2018 Pressure Vessels and Piping Conference. American Society of Mechanical Engineers, 2018. http://dx.doi.org/10.1115/pvp2018-85067.

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Kevlar composite materials are getting scientific interest in repairing of oil and gas pipelines in both offshore and onshore due to their unique properties. Curing is one of the major factor in deciding the final mechanical performance of laminated Kevlar/epoxy nanocomposites. The parameters such as curing time, temperature and applied pressure during the hot pressing will affect chemistry of crosslinking of the epoxy matrix and interaction of epoxy with the Kevlar fiber. The present study is carried out to evaluate the optimal curing conditions of the Kevlar/epoxy nanocomposites. Three different nanofillers (namely Multi walled Carbon nanotubes (MWCNT), Silicon Carbide (SiC) and Aluminum Oxide (Al2O3)) are incorporated in different weight percentage. Differential Scanning Calorimetry (DSC) and Thermo-Gravimetric Analysis (TGA) tests are carried out to determine the thermal stability and optimal curing conditions. Mechanical performance is investigated by conducting flexure, and drop weight tests. The results show that, the optimal curing temperature for maximizing the mechanical properties is at 170°C. Peeling off the Kevlar layers are observed for nanocomposite samples cured under 100°C. Mechanical strength of the composites is enhanced by optimizing the curing conditions and nanofiller contents.
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9

Kontou, Evangelia, Michael Niaounakis, A. D’Amore, Domenico Acierno, and Luigi Grassia. "Comparing Nanofillers in Polylactide Nanocomposites." In V INTERNATIONAL CONFERENCE ON TIMES OF POLYMERS (TOP) AND COMPOSITES. AIP, 2010. http://dx.doi.org/10.1063/1.3455547.

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Sarlin, Juha, Kirsi Immonen, A. D’Amore, Domenico Acierno, and Luigi Grassia. "PP composites with Hybrid Nanofillers: NTC phenomenon." In V INTERNATIONAL CONFERENCE ON TIMES OF POLYMERS (TOP) AND COMPOSITES. AIP, 2010. http://dx.doi.org/10.1063/1.3455674.

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