Letteratura scientifica selezionata sul tema "Micro-hybrid composite resins"
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Articoli di riviste sul tema "Micro-hybrid composite resins"
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Stoleriu, Simona, Sorin Andrian, Irina Nica, Andrei Victor Sandu, Galina Pancu, Alice Murariu e Gianina Iovan. "Evaluation of Adhesive Capacity of Universal Bonding Agents Used in Direct Composite Resins Repair". Materiale Plastice 54, n. 3 (30 settembre 2017): 574–77. http://dx.doi.org/10.37358/mp.17.3.4899.
Testo completoAbstract (sommario):
The aims of the study were to characterise the resin-resin interface when a universal bonding agent (UBA) was used in two different strategies in direct composite repair and to evaluate the bonding capacity of UBA by microleakage assessment. In study groups a micro-filled hybrid and a nano-filled hybrid composite resins were aged in order to simulate an old restorations. As a repair material was chosen the same micro-filled hybrid composite resin that was used as an old restoration. UBA was applied in etch-and-rinse and self-etch strategies and was used as an intermediate layer in repair procedure. After the repair the samples were aged again. In control groups were included non-aged, repaired composite resins samples. The resin-resin interface was characterised on SEM images and the microleakage at the interface was evaluated by dye penetration assessment. Universal bonding agent used in direct composite resins repair showed a very good adaptation to non-aged micro-filled hybrid and nano-filled hybrid composite resins. Aging by saliva storage of repaired composite resins leaded to an enlargement of resin-resin junction and a increased microleakage irrespective of the strategy (etch-and-rinse or self -etch) used for bonding agent application. Etch-and-rinse strategy for universal bonging agent application determined a better interface bonding when compared to self -etch strategy.
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Andrian, Sorin, Galina Pancu, Claudiu Topoliceanu, Nicoleta Tofan, Simona Stoleriu e Gianina Iovan. "Evaluation of Compressive Strength of Repaired Direct Composite Resin Restorations". Revista de Chimie 68, n. 8 (15 settembre 2017): 1874–78. http://dx.doi.org/10.37358/rc.17.8.5783.
Testo completoAbstract (sommario):
The aim of the study was to evaluate and to compare the compressive parameters of repaired composite restoration when using different types of composite resins and a universal bonding agent as an intermediate layer. Aged micro-filled hybrid and nano-filled hybrid composite resins were chosen to simulate old restoration. The same micro-filled hybrid composite resin was used as a repair material. A universal bonding agent applied in etch-and-rinse and self etch strategies was used as an intermediate layer in restoration repair. Non-aged composite resins were considered as control. Compressive strength and compressive modulus were determined by evaluating the samples in a universal testing machine. Lower values of the tested parameters were recorded after aging both types of composite resin when compared to control. Higher values of compressive strength were recorded when nano-filled hybrid composite resin was repaired when compared to micro-filled hybrid composite resin. The strategy of universal bonding agent application as an intermediate layer did not influenced the compressive properties of repaired restoration.
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Nogueira, Ruchele Dias, Rosa Maria Pereira Moisés Barbosa Andrade, Ailla Carla Rocha Acosta Lancellotti, Regina Guenka Palma-Dibb e Vinícius Rangel Geraldo-Martins. "Effect of Chemical Degradation on Surface Roughness and on Color Stability of Micro hybrid and Nanofilled Composites". Journal of Health Sciences 20, n. 3 (31 ottobre 2018): 167. http://dx.doi.org/10.17921/2447-8938.2018v20n3p167-172.
Testo completoAbstract (sommario):
ResumoA resina composta é o material restaurador mais utilizado atualmente. Apesar de seu sucesso clínico, o material está sujeito a alterações em suas propriedades físicas, quando exposto ao meio bucal. O objetivo foi avaliar a influência da degradação química na estabilidade de cor e na rugosidade superficial de resinas micro-híbrida e nanoparticulada. Foram confeccionados 40 discos (6,0mm x 2,0mm) da resina composta micro-híbrida (Z250XT) e 40 da resina nanoparticulada (Z350XT). Após a análise da cor inicial e da rugosidade inicial, 10 discos de cada resina foram imersos em saliva artificial (Controle, pH=6,4), suco de laranja (pH= 3,4), refrigerante de limão (pH=2,9) e vinho tinto (pH=3,1), por 4 horas por dia (37ºC) durante 30 dias. Após, foram realizadas as leituras finais de cor e rugosidade. Os dados obtidos para a estabilidade de cor foram analisados pelo Teste de Kruskal-Wallis, seguido pelo Teste de Dunn (α=5%). Para a análise da rugosidade foi utilizado o Teste t para amostras pareadas (α=5%). O manchamento provocado pela saliva artificial, suco de laranja e refrigerante foi similar, mas foi estatisticamente diferente do manchamento produzido pelo vinho, em ambas as resinas testadas. O vinho produziu o mesmo grau de manchamento nas resinas micro-híbrida e nanoparticulada. Foi observado que o suco de laranja, o refrigerante e o vinho promoveram aumento da rugosidade superficial dos discos de resina. Diante disso, concluiu-se que o vinho alterou a cor de resinas compostas micro-híbrida e nanoparticulada, e que a rugosidade superficial dos discos de resina foi alterada por todas as bebidas utilizadas.Palavras chave: Resinas Compostas. Corantes. Cor.Abstract Composite resin is the most used restorative material. Despite its clinical success, it is susceptible to changes in its physical properties when exposed to the oral environment. The aim was to evaluate the influence of acidic beverages on the color stability and on the surface roughness of the nanofilled and micro hybrid composite. Forty discs (6.0mm x 2.0mm) of the micro hybrid composite (Z250XT) and 40 of the nanofilled composite (Z350XT) were manufactured. After the measurement of the initial color and the initial roughness, 10 discs of each composite were individually immersed in artificial saliva (control, pH = 6.4), orange juice (pH=3.4), lime soda (pH = 2.9) and red wine (pH = 3.1) during 4 hours per day at 37°C for 30 days. At the end of the experiment, the final analysis of color and surface roughness were performed. The data obtained for the color stability were analyzed by Kruskal-Wallis and Dunn’s test (α= 5%). For the analysis of the surface roughness, the t test for related samples was used (α= 5%). The color changes promoted by artificial saliva, orange juice and soda were similar, but they were statistically different from staining produced by wine, in both tested composites. Wine produced the same degree of staining in both composites. Orange juice, soda and red wine increased the surface roughness of the composite discs. It was concluded that red wine significantly changes the color of micro hybrid and nanofilled composites. Furthermore, all beverages increased the surface roughness of the composites tested in the study herein.Keywords: Composite Resins. Coloring Agents. Color.
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Cinelli, Francesca, Daniele Scaminaci Russo, Michele Nieri e Luca Giachetti. "Stain Susceptibility of Composite Resins: Pigment Penetration Analysis". Materials 15, n. 14 (13 luglio 2022): 4874. http://dx.doi.org/10.3390/ma15144874.
Testo completoAbstract (sommario):
Composite resins are considered the material of choice for esthetic direct restorations, considering both their satisfying esthetic and mechanical properties. The success of composite resin restorations depends highly on their color stability. Discoloration causes color mismatch, consequent patient dissatisfaction, and eventually additional costs for correction/replacement of the restoration. The purpose of this study was to evaluate the degree of pigment penetration within the composite resins, in order to understand how discoloration can be treated properly. Two different commercially available composite resins were compared in the study: a nano-filled composite resin and a non-homogeneous micro-hybrid composite resin. A coffee solution was used to induce staining of the materials. Subsequently, the penetration of the pigments was measured by analyzing the color from the outside to the inside of the specimen. 14 levels were analyzed starting from 0.1 mm to 3.0 mm in depth. The ANOVA test demonstrated a statistically significant difference (p < 0.0001) between test and control groups up to a depth of 1.0 mm for the nano-filled composite and up to a depth of 2.0 mm for the non-homogeneous micro-hybrid composite. The two composite resin materials, subjected to pigmenting treatment, underwent a color variation with different patterns.
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Rajasekhar, Reshma, Baby James, Minimol K. Johny e Jose Jacob. "Evaluation of the effect of two commercially available non-alcoholic mouth rinses on the microhardness of composite material - An invitro study". Current Dental Research Journal 1, Issue 1 (30 maggio 2019): 14–21. http://dx.doi.org/10.12944/cdrj.01.o1.03.
Testo completoAbstract (sommario):
Composites have been widely used for anterior as well as posterior restorations due to increased aesthetic demands. Composite restorations placed in patients oral cavity is subjected to masticatory load, pH changes and chemical effect due to mouthwashes, beverages, food etc and the detrimental effects associated with these challenges on the microhardness of composite has to be determined. The study was conducted to evaluate the effect of two commercially available non-alcoholic mouth rinses on the microhardness of micro-hybrid and nanohybrid composite resins. Forty disc-shaped composite specimens were made from each type of composite materials and were divided into 5 groups with 8 samples each, Group 1= Microhybrid+Chlorhex, Group2=Microhybrid + Hexidine, Group3= Nanohybrid + Chlorhex, Group4= Nanohybrid+ Hexidine, Group 5= Nanohybrid and Micro hybrid + artificial saliva(Control).The samples were immersed in mouthrinses for 24 hrs and microhardness was subsequently measured using a Vicker’s microhardness tester. There was no significant difference in microhardness values of tested composite resins in either mouth rinses when compared to composites immersed in artificial saliva. Non-alcoholic mouth rinses do not affect the microhardness of micro-hybrid and nanohybrid composites.
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Alnasser, Hamad A., Ahmed A. Elhejazi, Abdalrahman A. Al-Abdulaziz, Saad S. Alajlan e Syed Rashid Habib. "Effect of Conventional and Electronic Cigarettes Smoking on the Color Stability and Translucency of Tooth Colored Restorative Materials: An In Vitro Analysis". Coatings 11, n. 12 (20 dicembre 2021): 1568. http://dx.doi.org/10.3390/coatings11121568.
Testo completoAbstract (sommario):
This in vitro study compared the effects of conventional and electronic cigarettes on the aesthetics (color stability and translucency) of two types of composite resins: micro and nano-hybrid. Methods: A total of 120 specimens from two different composite materials Filtek Z250 XT (Nano-hybrid, 3M) and Filtek Z250 (Micro-hybrid, 3M) were divided into four groups (n = 30); shade A2 was used. The samples were exposed to conventional and electronic cigarette smoke via a custom made chamber device. The color values and measurements were recorded using a spectrophotometer before and after the exposure. The color and translucency were evaluated using the three-dimensional CIE Lab. Results: There was a significant change in the color (ΔE) and the translucency parameter (TP) in all of the specimens exposed to electronic cigarettes and conventional cigarettes. The results showed that the highest ΔE mean is for the nano-hybrid composite exposed to conventional cigarettes with 1.74 ΔE while the same material is 0.64 under the electronic cigarettes and the difference is significant with (p < 0.05). The micro-hybrid composite data showed less changes in color under both exposures with 0.85 ΔE mean under the conventional cigarette smoke and 0.48 under the electronic cigarette smoke with (p < 0.004). Conclusions: The conventional cigarette smoke has more effect on the color stability of the composite resins than electronic cigarettes. From a clinical point of view, the effect of smoke exposure on the tested specimens’ color, for the time duration to which the specimens were exposed, were moderate (ΔE < 2). The micro-hybrid composites showed better color stability as compared to the nano-hybrid composites.
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Brunharo, Ione Helena Vieira Portella, Daniel Jogaib Fernandes, Mauro Sayão de Miranda e Flavia Artese. "Influence of surface treatment on shear bond strength of orthodontic brackets". Dental Press Journal of Orthodontics 18, n. 3 (giugno 2013): 54–62. http://dx.doi.org/10.1590/s2176-94512013000300010.
Testo completoAbstract (sommario):
INTRODUCTION: The shear bond strength of orthodontic brackets bonded to micro-hybrid and micro-particulate resins under different surface treatment methods was assessed. METHODS: Two hundred and eighty test samples were divided into 28 groups (n = 10), where 140 specimens were filled with Durafill micro-particulate resin and 140 with Charisma composite. In 140 samples, a coupling agent (silane) was applied. The surface treatment methods were: Phosphoric and hydrofluoric acid etching, sodium bicarbonate and aluminum oxide blasting, stone and burs. A Universal Instron Machine was used to apply an occlusal shear force directly to the resin composite bracket surface at a speed of 0.5 mm/min. The means were compared using analysis of variance and multivariate regression to assess the interaction between composites and surface treatment methods. RESULTS: Means and standard deviations for the groups were: Sodium bicarbonate jet 11.27±2.78; burs 9.26±3.01; stone 7.95±3.67; aluminum oxide blasting 7.04±3.21; phosphoric acid 5.82±1.90; hydrofluoric acid 4.54±2.87, and without treatment 2.75±1.49. An increase of 1.94 MPa in shear bond strength was seen in Charisma groups. Silane agent application reduced the Charisma shear bond strength by 0.68 Mpa, but increased Durafill means for bicarbonate blasting (0.83), burs (0.98) and stone drilling (0.46). CONCLUSION: The sodium bicarbonate blasting, burs and stone drilling methods produced adequate shear bond strength and may be suitable for clinical use. The Charisma micro hybrid resin composite showed higher shear bond means than Durafill micro particle composite.
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Ávila, Gisseli Bertozzi, Sergio Candido Dias, Mariana Lima da Costa Valente, José Augusto Marcondes Agnelli e Andréa Candido dos Reis. "Color stability evaluation of micro hybrid composite resins submitted to accelerated artificial aging". Clinical and Laboratorial Research in Dentistry 21, n. 4 (31 dicembre 2015): 227. http://dx.doi.org/10.11606/issn.2357-8041.clrd.2015.128882.
Testo completoAbstract (sommario):
Objective: The aesthetics of dental materials is extremely important for the success of oral rehabilitation. Thus, in the present study we evaluated the color stability and the surface degradation of three micro hybrid composite resins after accelerated artificial aging process (AAA). Methods: Were prepared 24 specimens (n=8) for each material: Solidex, Artglass and Cesead, dimensions of Ø 15 mm by 2 mm in thickness. The samples were subjected to color analysis, before and after AAA, in a spectrophotometer according to the CIE L*a*b* parameters, and a sample of each material, was selected for morphological evaluation under scanning electron microscopy (SEM). The data were submitted to one-way ANOVA and Tukey test (α=0.05). Results: Artglass showed higher stability regarding the presence of red and yellow (p<0.05) when subjected to the AAA and fewer of these pigments (p<0.05) when compared to the Cesead and Solidex, which showed the highest luminance stability (p<0.05). ΔE Cesead was the most unstable (p<0.05). All resins analyzed by SEM showed superficial degradation when submitted to the AAA, mainly in resin Cesead. Conclusion: All materials analyzed demonstrate color change and surface degradation, Cesead resin showed the worse results.
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Arigbede, Abiodun Olabisi, Bukola Folasade Adeyemi e Omowumi Femi-Akinlosotu. "Relative biocompatibility of micro-hybrid and nano-hybrid light-activated composite resins". Journal of Dental Research, Dental Clinics, Dental Prospects 11, n. 1 (15 marzo 2017): 1–6. http://dx.doi.org/10.15171/joddd.2017.001.
Testo completo
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H. A, Omokhua, Sede M. A e Enabulele J. E. "Clinical evaluation of the functional performance of organically modified ceramics (ormocers), nanohybrid, and microhybrid composite in permanent posterior teeth restorations." Ghana Dental Journal 19 (21 giugno 2022): 52–59. http://dx.doi.org/10.4314/gdj.v19i1.8.
Testo completoAbstract (sommario):
Background : In recent times, resin-based direct composite restorations have become a routine and well-established dental practice, meeting the demands for aesthetics and minimally invasive restorative care. The use of resin-based composite resin for defects in posterior teeth is on the rise. A good knowledge of adhesives, composite resins, and polymerization kinetics is required to effectively use composite in patient care.Objective : To compare the functional clinical performance of an ormocer and a nanohybrid to that of a traditional microhybrid composite in posterior teeth restorations.Material and Method : Patients with at least three carious lesions which required replacement (Class Ι and/or Class ΙΙ), each with an opposing tooth, were enrolled in this study. A total of 105 restorations were placed, 35 for each. The materials used for this study included an ormocer-based composite, a nanohybrid resin composite, and a micro-hybrid resin composite. One operator placed all the restorations according to the manufacturers’ instructions. Each restoration is finished and polished immediately after placement. The patient returned for follow-up evaluation at one(1 )month, three (3 )months,six6 months, and 12 months. Two independent examiners calibrated with the web-based training called e-calib performed the evaluation using the FDI Criteria.Results : A total of 105 resin composite restorations, 35 restorations for each of the study materials, were placed in 35 subjects, with a female to male ratio of 4.8:1. The subject recall rate was 100%. All ormocer, nanohybrid, and micro-hybrid resin composites restorations recorded 100% clinically excellent scores from baseline to 3 months for all parameters. Most of the study materials showed a decrease from 100% clinically excellent scores, with a few recordings clinically good at 12 months. At least one restoration of each material experienced a deterioration of the parameters, fracture, retention of materials, and proximal anatomic form.The functional clinical performance of ormocer admira (voco), Tetric EvoCeram (Ivoclar Vivadent), a Nanohybrid, and tetric Ceram (Excite), a micro-hybrid were satisfactory in the restorations of carious posterior permanent teeth. The majority of the restorations maintained clinically excellent scores from 1 month to 12 months. There was, however, no record of scores 3, 4, or 5 by any of the test materials throughout the study.Conclusion : The functional clinical performance of ormocer admira (voco), Tetric EvoCeram (Ivoclar Vivadent), a Nanohybrid, and tetric Ceram (Excite) micro-hybrid were satisfactory in the restorations of posterior permanent teeth restorations.
Tesi sul tema "Micro-hybrid composite resins"
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Yew, Hsu Zenn. "Colour changes in nano-filled and micro-hybrid composite resins on exposure to spices". Thesis, 2012. http://hdl.handle.net/2440/73307.
Testo completoAbstract (sommario):
Colour changes in composite resins after immersion in beverages such as coffee, tea, alcohol beverage and carbonated drinks have been reported. Although much work has been done to determine the staining susceptibility of composite resins to various liquid beverages, effects of spices on colour stability of composite resins have not been fully researched.
Objectives: The aim of this study is to evaluate the colour stability of nano-filled (Filtek Supreme™) and micro-hybrid (Gradia Direct™) composite resins finished with either Sof-Lex™ discs or mylar strips upon exposure to turmeric, paprika and tamarind.
Materials and methods: Twenty cylindrical specimens were fabricated from two commercially available composite resins; Filtek Supreme XT™ (3M ESPE, St Paul, MN) and Gradia Direct X™(GC AMERICA). The top surfaces of the specimen were polished with Sof–Lex™ aluminium oxide discs (3M/ESPE, St Paul, MN USA) while the bottom surfaces were mylar strips finished. All samples were subjected to 500 thermocycling rounds between 5 and 55 ºC with 20 seconds dwell time prior to immersion in staining solution. Twenty specimens from each type of composite were then randomly divided into 4 groups (n=5) and immersed in each staining solutions (0.1% turmeric, paprika and tamarind) and distilled water (control) at 37 ºC. Colour measurement at baseline, after thermocycling, 24 hours (1 day), 72 hours (3 days) and 168 hours (7 days) of immersion in staining solutions were recorded with a reflection spectrophotometer under the D65 (daylight) illuminant using CIE L* a* b* parameters. Repeated measures analysis of variance (ANOVA) and Bonferroni post hoc tests were used to determine the significance and possible interactions of each factor.
Results: Among all the staining solutions tested, the highest colour deviation was obtained in the turmeric group, with mean colour change (ΔE) ranging between 17.92 and 55.25. Paprika recorded mean colour change (ΔE) ranging between 1.28 and 3.72, while tamarind produced mean colour change (ΔE) ranging between 1.12 and 5.42. The effect of finishing method on colour stability of composite resins appeared to be dependent on the type of composite resin. Filtek Supreme™ with mylar strips finished generally resulted in significantly more colour changes compared with specimens polished Sof-Lex™ discs, while Gradia Direct™ finished with mylar strips were found to be more resistant to colour changes. Colour change (ΔE) values were significantly influenced by the staining solutions, types of materials and finishing methods.
Conclusion: Within the limitations of this study, all spices used (turmeric, paprika and tamarind) have a potential to stain composite resins; with turmeric causing the most severe discolouration regardless of the type of composite resin or finishing technique employed. The result of this study also suggests that different materials respond differently to staining by spices when either finished with mylar strips or polished with Sof-Lex™ discs. Also, contemporary composite resins available in the market e.g. nano-composite and micro-filled hybrid composite are still susceptible to discolouration by exogenous factors despite advancement in the development of resin based restorative material.Thesis (D.Clin.Dent.) -- University of Adelaide, School of Dentistry, 2012
Capitoli di libri sul tema "Micro-hybrid composite resins"
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Khomenko, Anton, Ermias G. Koricho e Mahmoodul Haq. "Curing Induced Shrinkage: Measurement and Effect of Micro-/Nano-Modified Resins on Tensile Strengths". In Composite, Hybrid, and Multifunctional Materials, Volume 4, 157–63. Cham: Springer International Publishing, 2014. http://dx.doi.org/10.1007/978-3-319-06992-0_20.
Testo completoAtti di convegni sul tema "Micro-hybrid composite resins"
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Camerlingo, C., G. M. Gaeta, R. Riccio, F. Rosso, L. Muscariello e M. Lepore. "Micro-Raman spectroscopy and E-SEM analysis of hybrid layer at the dentine/resin interface of three different composite restorative resins". In Biomedical Optics 2006, a cura di Peter Rechmann e Daniel Fried. SPIE, 2006. http://dx.doi.org/10.1117/12.640317.
Testo completo
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Kim, Sung-Geun, Won-Shik Chu, Hyung-Jung Kim e Sung-Hoon Ahn. "Measurement of Mechanical Strength of Nano Composite Fabricated by Nano Composite Deposition System (NCDS)". In ASME 2006 Multifunctional Nanocomposites International Conference. ASMEDC, 2006. http://dx.doi.org/10.1115/mn2006-17031.
Testo completoAbstract (sommario):
The rapid prototyping (RP) technology has been advanced for various applications such as verification of design, functional test. Recently, researchers have studied various materials to fabricate functional RP parts. In this research, a nano composite deposition system (NCDS), which can fabricate various nano composites using polymer resins with various nano particles, was introduced. The NCDS is a hybrid system in which material removal process by mechanical micro machining and/or the deposition process is combined. To predict the mechanical behavior of nano composite part made by NCDS, it is critical to understand the mechanical properties of the NCDS material. The NCDS process was characterizes by process parameters such as raster orientation, bead width, weight percent, and curing condition. Tensile strengths and compressive strengths of fabricated specimens with various raster orientation were measured, and various sample parts made of nano composites were fabricated using NCDS.
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Hamada, Hiroyuki, Asami Nakai, Kazuya Eto e Kenichi Sugimoto. "Mechanical Properties of Matrix Hybrid Thick-Composites". In ASME 2004 International Mechanical Engineering Congress and Exposition. ASMEDC, 2004. http://dx.doi.org/10.1115/imece2004-62305.
Testo completoAbstract (sommario):
For the purpose of more safety boats, the large thickness of outer plates is required to increase flexural stiffness, strength and impact properties. Some problems in mechanical properties are generated by increasing in thickness because the effect of interlaminar shearing of Thick-composites on whole mechanical properties is greater than that of thin-composites. We have investigated the matrix hybrid composite with two kinds of unsaturated polyester, one was hard type resin with low toughness and the other was flexible type resin with low modulus and high toughness. In this study, matrix hybrid composite was focused and applied to Thick-composites. First, the flexural properties were investigated and the micro fracture progress was precisely observed with in-situ observation using replica method. Then, impact properties of the Thick-composites were examined and the availability of matrix hybrid composite was investigated. It was concluded that the matrix hybrid composite achieved high performance in both static and impact load.
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Barua, Bipul, e Mrinal C. Saha. "Manufacturing and Flexure Properties Characterization of Hybrid Nano-/Micro-Fiber Reinforced Epoxy Composites". In ASME 2011 International Mechanical Engineering Congress and Exposition. ASMEDC, 2011. http://dx.doi.org/10.1115/imece2011-64191.
Testo completoAbstract (sommario):
We report an approach for the deposition of carbon nanotubes (CNTs) on carbon fabrics (CFs) en route for the development of hybrid nano-/micro-fiber composite structures. Ultrasonic atomization process was utilized for the direct deposition of CNTs on the surface of carbon fiber fabric. A dilute solution of CNTs was prepared by dispersing very small amount of multi walled CNTs (MWNT) in N,N-Dimethylformamide (DMF) using a low frequency ultrasonic water bath. The dispersed solution was then fed into the ultrasonic atomizer probe using a syringe pump and sprayed directly on the carbon fiber fabric rested on a hot plate. The dispersion of MWNTs in DMF solvent was characterized using UV spectroscopy and the distribution of CNTs on CF was characterized using scanning electron microscopy (SEM). Vacuum assisted resin transfer molding (VRTM) was used to manufacture composite laminates using several layers of CNTs hybrid CF fabrics. We prepared hybrid composite laminates containing 0.03-wt% of CNTs. Dispersion of CNTs in DMF and distribution of CNTs on CFs was found to be very good which we believed to be resulted in about 15% improvement in flexure strength and about 12% improvement in strain to failure compared to neat composites. Such improvements in composite properties with only 0.03% CNTs are very promising in hybrid composite structures.
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Velukkudi Santhanam, Senthil Kumar, Prakash Sampath, Bharani Srikanth Ponnusamy e Mohan Bangaru. "Effect of Micro (Banana) and Nano (SiC) Fillers on Mechanical Behaviors of Basalt/Epoxy Hybrid Composites". In ASME 2018 International Mechanical Engineering Congress and Exposition. American Society of Mechanical Engineers, 2018. http://dx.doi.org/10.1115/imece2018-86268.
Testo completoAbstract (sommario):
Basalt Fibre Reinforced Polymers (BFRP) was feasibly utilized as a preferable replacement to the Glass Fibre Reinforced Polymers (GFRP) due to their superior property and behaviour. Besides, reinforcing nano and micro fillers with basalt fiber will result in even better mechanical properties. In this research study, epoxy resin was blended with Cashew Nut Shell Liquid (CNSL) hardener, it beneficial to minimize the healing period. For 50% of epoxy resin, the ratio of CNSL hardener was taken as 50%. Standard Hand lay-up technique was utilized to produce the composite structures. In addition, 20g of nano and micro fillers were mixed with each epoxy-CNSL proportion. Accordingly, both (SiC & Banana) filler reinforced composites were fabricated and cut to the ASTM standard. Finally, the result of mechanical properties such as flexural and the impact (Charpy) of silicon carbide (SiC) and banana filler reinforced samples were compared.