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Manjusri Misra - One of the best experts on this subject based on the ideXlab platform.
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static and dynamic mechanical properties of vinylester Resin matrix composites filled with fly ash
Macromolecular Materials and Engineering, 2006Co-Authors: Dipa Ray, Debadrita Bhattacharya, Lawrence T Drzal, Amar K Mohanty, Manjusri MisraAbstract:Vinylester Resin matrix composites were prepared with a fly ash loading of 30, 40, 50 and 60 wt.-%. Flexural properties of the composites were investigated. It was found that the flexural strength was lowered in all the filled composites, but the flexural modulus showed a significant increase of 10, 57, 112% in case of 30,40 and 50 wt.-% fly-ash-loaded composites respectively, compared to the Neat Resin. However, there was a decrease in the mechanical properties in case of 60 wt.-% fly-ash-filled composites. The dynamic mechanical analysis was carried out to obtain information about the matrix-filler interaction at the interface. The storage modulus value at room temperature was highest for the 50 wt.-% fly-ash-filled composites, corroborating with the observed flexural modulus value. The fractured surfaces were examined under SEM and were correlated with the mechanical properties.
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static and dynamic mechanical properties of vinylester Resin matrix composites filled with fly ash
Macromolecular Materials and Engineering, 2006Co-Authors: Dipa Ray, Debadrita Bhattacharya, Lawrence T Drzal, Amar K Mohanty, Manjusri MisraAbstract:Vinylester Resin matrix composites were prepared with a fly ash loading of 30, 40, 50 and 60 wt.-%. Flexural properties of the composites were investigated. It was found that the flexural strength was lowered in all the filled composites, but the flexural modulus showed a significant increase of 10, 57, 112% in case of 30,40 and 50 wt.-% fly-ash-loaded composites respectively, compared to the Neat Resin. However, there was a decrease in the mechanical properties in case of 60 wt.-% fly-ash-filled composites. The dynamic mechanical analysis was carried out to obtain information about the matrix-filler interaction at the interface. The storage modulus value at room temperature was highest for the 50 wt.-% fly-ash-filled composites, corroborating with the observed flexural modulus value. The fractured surfaces were examined under SEM and were correlated with the mechanical properties.
Nikhil Gupta - One of the best experts on this subject based on the ideXlab platform.
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influence of moisture absorption on flexural properties of syntactic foams
Composites Part B-engineering, 2012Co-Authors: G Tagliavia, Maurizio Porfiri, Nikhil GuptaAbstract:Abstract This work studies the influence of moisture absorption on the flexural properties of vinyl ester matrix–glass particle syntactic foams. The extent and the effect of moisture absorption are related to the wall thickness and volume fraction of the particles present in the composite. Four compositions of vinyl ester–glass systems are exposed to deionized and sea water conditions. Experimental findings are compared with results on virgin specimens. In general, the exposure of syntactic foams to a water environment yields a deterioration of Young’s modulus. This phenomenon is more prominent with deionized water as compared to sea water and increases with the particle volume fraction. In addition, results from water absorption tests show that syntactic foams have a lower diffusivity as compared to the Neat Resin. Experimental data are interpreted by using available modeling tools that allow for predicting the composite behavior from the properties of its constituents.
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comparison of tensile and compressive characteristics of vinyl ester glass microballoon syntactic foams
Composites Part B-engineering, 2010Co-Authors: Nikhil Gupta, Raymond Ye, Maurizio PorfiriAbstract:Abstract The present study is focused on the synthesis and characterization of vinyl ester/glass microballoon syntactic foams. Tensile and compressive properties of vinyl ester matrix syntactic foams are characterized. Results show that the compressive strength and moduli of several syntactic foam compositions are comparable to those of the Neat matrix Resin. Due to the lower density of syntactic foams, the specific compressive properties of all compositions are higher than those of the Neat Resin. Similar trends are observed in the tensile properties. Mechanical properties of vinyl ester matrix syntactic foams are compared to well-documented mechanical properties of epoxy matrix systems. The comparison shows that low cost vinyl ester Resins, which are extensively used in marine applications, can result in syntactic foams with comparable performance to epoxy matrix systems. In addition, tensile modulus is found to be 15–30% higher than the compressive modulus for all syntactic foam compositions. This difference is related to the possibility of particle fracture in the stress range where modulus is calculated in the compressive stress–strain curves.
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analysis of flexural properties of hollow particle filled composites
Composites Part B-engineering, 2010Co-Authors: G Tagliavia, Maurizio Porfiri, Nikhil GuptaAbstract:Abstract This paper studies flexural properties of vinyl ester–glass hollow-particle filled composites, which are used in marine applications. Sixteen compositions of composite materials are studied under three-point bending conditions to assess the effect of wall thickness and volume fraction of hollow inclusions. The results show that the flexural modulus of several composites is higher as compared to the Neat Resin. Moreover, the specific modulus of all composites is higher than the Neat Resin providing the possibility of appreciable weight saving in marine structures. Nevertheless, the flexural strength of the composites is lower than that of the Neat Resin. In addition, it is found that the flexural strength decreases as the inclusion volume fraction increases and is independent of the inclusion wall thickness. An analytical framework is presented to interpret the experimental findings and generate predictive capabilities for hollow-particle filled composites. Tractable formulas are used for computing the flexural modulus and strength from the mechanical and geometrical properties of the constituents. Analytical and experimental results are found to be in close agreement.
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tensile properties of glass microballoon epoxy Resin syntactic foams
Journal of Applied Polymer Science, 2006Co-Authors: Nikhil Gupta, Ruslan NagornyAbstract:The effect of hollow glass particle (microballoon) volume fraction in the range of 0.3–0.6 on the tensile properties and fracture mode of syntactic foams is characterized in the present research. Sixteen types of syntactic foams have been fabricated and tested. Four types of glass microballoons, having 220, 320, 380, and 460 kg/m3 density, are used with epoxy Resin matrix for making the syntactic foam samples. These foams contain 30, 40, 50 and 60% microballoons by volume. All types of microballoons have the same size but different wall thickness, which reflects as a difference in their density. It is observed that the tensile strength increases with a decrease in the volume fraction of microballoons. All types of syntactic foams showed 60–80% decrease in the tensile strength compared with that of the Neat Resin. The foams containing low strength microballoons showed lower tensile modulus compared with that of the Neat Resin, but the presence of high strength microballoons led to an increase in the tensile modulus of the composites. © 2006 Wiley Periodicals, Inc. J Appl Polym Sci 102: 1254–1261, 2006
Dipa Ray - One of the best experts on this subject based on the ideXlab platform.
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friction and wear behavior of vinylester Resin matrix composites filled with fly ash particles
Journal of Reinforced Plastics and Composites, 2007Co-Authors: Dipa Ray, R GnanamoorthyAbstract:Fly ash filled vinylester Resin matrix composites were prepared with a filler loading of 40 and 50 wt%. The friction and wear behavior of Neat Resin and fly ash filled composites were studied with the help of a pin-on-disc wear tester with the composite pin sliding over an abrasive sheet under three different normal loads. Wear behavior was quantified in terms of weight loss, linear wear, and coefficient of friction of the test samples; these were much higher in Neat Resin compared to composites. Among the composites, a better wear resistance was shown by the 40% filled composites with a lower wear loss, lesser linear wear, and a minimum value of the coefficient of friction. It was evident that the linear wear increased steadily in the case of vinylester Resin with increase in sliding distance, whereas linear wear was much less and was almost constant in the composites with the increase in sliding distance under all three different normal loads. It was also observed that the difference between the coeffic...
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static and dynamic mechanical properties of vinylester Resin matrix composites filled with fly ash
Macromolecular Materials and Engineering, 2006Co-Authors: Dipa Ray, Debadrita Bhattacharya, Lawrence T Drzal, Amar K Mohanty, Manjusri MisraAbstract:Vinylester Resin matrix composites were prepared with a fly ash loading of 30, 40, 50 and 60 wt.-%. Flexural properties of the composites were investigated. It was found that the flexural strength was lowered in all the filled composites, but the flexural modulus showed a significant increase of 10, 57, 112% in case of 30,40 and 50 wt.-% fly-ash-loaded composites respectively, compared to the Neat Resin. However, there was a decrease in the mechanical properties in case of 60 wt.-% fly-ash-filled composites. The dynamic mechanical analysis was carried out to obtain information about the matrix-filler interaction at the interface. The storage modulus value at room temperature was highest for the 50 wt.-% fly-ash-filled composites, corroborating with the observed flexural modulus value. The fractured surfaces were examined under SEM and were correlated with the mechanical properties.
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static and dynamic mechanical properties of vinylester Resin matrix composites filled with fly ash
Macromolecular Materials and Engineering, 2006Co-Authors: Dipa Ray, Debadrita Bhattacharya, Lawrence T Drzal, Amar K Mohanty, Manjusri MisraAbstract:Vinylester Resin matrix composites were prepared with a fly ash loading of 30, 40, 50 and 60 wt.-%. Flexural properties of the composites were investigated. It was found that the flexural strength was lowered in all the filled composites, but the flexural modulus showed a significant increase of 10, 57, 112% in case of 30,40 and 50 wt.-% fly-ash-loaded composites respectively, compared to the Neat Resin. However, there was a decrease in the mechanical properties in case of 60 wt.-% fly-ash-filled composites. The dynamic mechanical analysis was carried out to obtain information about the matrix-filler interaction at the interface. The storage modulus value at room temperature was highest for the 50 wt.-% fly-ash-filled composites, corroborating with the observed flexural modulus value. The fractured surfaces were examined under SEM and were correlated with the mechanical properties.
Steven Nutt - One of the best experts on this subject based on the ideXlab platform.
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a cyanate ester microcapsule system with low cure temperature and self healing capacity
Composites Science and Technology, 2013Co-Authors: Guozheng Liang, Li Yuan, Sidi Huang, Feng Chen, Steven NuttAbstract:Abstract Microcapsules filled with epoxy Resin were blended into cyanate ester Resin to produce systems with low cure temperature and self-healing capacity. A 4,4′-diaminodiphenylsulfone (DDS) curing agent was adopted for the systems. The mechanical properties, thermal stability and self-healing ability of the system cured at low temperature were investigated. Cyanate ester systems with 2.5 wt% and 5.0 wt% microcapsules (MCs) demonstrated an 11~43% increase in fracture toughness ( K IC ) relative to the Neat Resin cured at high temperature, and exhibited slightly lower thermal stability than the Neat Resin. The self-healing ability of cyanate ester with MCs was influenced by MC content and healing temperature, although for a formulation with 5.0 wt% MCs, recovery of 85% of the original fracture toughness was achieved by heat treatment of fractured samples for 1 h at 220 °C.
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hybrid network structure and mechanical properties of rodlike silicate cyanate ester nanocomposites
Macromolecules, 2008Co-Authors: Yongzheng Pan, Yuliang Yang, Wei Chen, Steven NuttAbstract:Silicate nanorods (attapulgite, ATT) were organically modified and homogeneously dispersed in a cyanate ester (CE) Resin. ATT dispersions and networks were characterized by rheological and microscopic measurements. Amine groups grafted onto the particle surface catalyzed the cyclotrimerization of the CE monomers and enabled the CE monomers to enter the inter-rod spacing of loose aggregates easily, resulting in homogenization of the particle size distribution in the nanocomposites. The addition of nanorods decreased the density of organic networks and increased intracyclizations. Covalent bonding at the interface was confirmed by Fourier transform infrared (FTIR) spectroscopy and dynamic mechanical analysis (DMA), which establishes a basis for enhancing/optimizing mechanical properties of CE Resins. Nanocomposite modulus, strength, and toughness increased 40, 42, and 55%, respectively, relative to the Neat Resin, although high nanorod loadings (e.g., 8 wt %) showed negligible benefit. The interplay between...
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improving the dispersion and flexural strength of multiwalled carbon nanotubes stiff epoxy composites through β hydroxyester surface functionalization coupled with the anionic homopolymerization of the epoxy matrix
European Polymer Journal, 2006Co-Authors: Wei Chen, Roberto J J Williams, Maria L Auad, Steven NuttAbstract:Abstract Multiwalled carbon nanotubes (MWNTs) were functionalized in a two-step acid-epoxy functionalization process, in which suitable surface condition and reactivity compatible with the DGEBA epoxy Resin was introduced. The use of (4-dimethylamino)-pyridine as an initiator for DGEBA homopolymerization produced covalent bonds between the functionalized MWNTs and the epoxy matrix through chain transfer reactions involving the secondary hydroxyls. This process yielded uniform MWNTs–stiff epoxy composites with significant enhancement in flexural strength without sacrificing the elastic modulus when compared to the Neat Resin.
Amar K Mohanty - One of the best experts on this subject based on the ideXlab platform.
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static and dynamic mechanical properties of vinylester Resin matrix composites filled with fly ash
Macromolecular Materials and Engineering, 2006Co-Authors: Dipa Ray, Debadrita Bhattacharya, Lawrence T Drzal, Amar K Mohanty, Manjusri MisraAbstract:Vinylester Resin matrix composites were prepared with a fly ash loading of 30, 40, 50 and 60 wt.-%. Flexural properties of the composites were investigated. It was found that the flexural strength was lowered in all the filled composites, but the flexural modulus showed a significant increase of 10, 57, 112% in case of 30,40 and 50 wt.-% fly-ash-loaded composites respectively, compared to the Neat Resin. However, there was a decrease in the mechanical properties in case of 60 wt.-% fly-ash-filled composites. The dynamic mechanical analysis was carried out to obtain information about the matrix-filler interaction at the interface. The storage modulus value at room temperature was highest for the 50 wt.-% fly-ash-filled composites, corroborating with the observed flexural modulus value. The fractured surfaces were examined under SEM and were correlated with the mechanical properties.
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static and dynamic mechanical properties of vinylester Resin matrix composites filled with fly ash
Macromolecular Materials and Engineering, 2006Co-Authors: Dipa Ray, Debadrita Bhattacharya, Lawrence T Drzal, Amar K Mohanty, Manjusri MisraAbstract:Vinylester Resin matrix composites were prepared with a fly ash loading of 30, 40, 50 and 60 wt.-%. Flexural properties of the composites were investigated. It was found that the flexural strength was lowered in all the filled composites, but the flexural modulus showed a significant increase of 10, 57, 112% in case of 30,40 and 50 wt.-% fly-ash-loaded composites respectively, compared to the Neat Resin. However, there was a decrease in the mechanical properties in case of 60 wt.-% fly-ash-filled composites. The dynamic mechanical analysis was carried out to obtain information about the matrix-filler interaction at the interface. The storage modulus value at room temperature was highest for the 50 wt.-% fly-ash-filled composites, corroborating with the observed flexural modulus value. The fractured surfaces were examined under SEM and were correlated with the mechanical properties.
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Green composites from recycled cellulose and poly(lactic acid) : Physico-mechanical and morphological properties evaluation
Journal of Materials Science, 2005Co-Authors: M. S. Huda, Elske Schut, Lawrence T Drzal, Amar K Mohanty, M MisraAbstract:“Green”/biobased composites were prepared from poly(lactic acid) (PLA) and recycled cellulose fibers (from newsprint) by extrusion followed by injection molding processing. The physico-mechanical and morphological properties of the composites were investigated as a function of varying amounts of cellulose fibers. Compared to the Neat Resin, the tensile and flexural moduli of the composites were significantly higher. This is due to higher modulus of the reinforcement added to the PLA matrix. Dynamic mechanical analysis (DMA) results also confirmed that the storage modulus of PLA increased on reinforcements with cellulose fibers indicating the stress transfers from the matrix Resin to cellulose fiber. Differential scanning calorimetry (DSC) and thermogravimetric analysis (TGA) showed that the presence of cellulose fibers did not significantly affect the crystallinity, or the thermal decomposition of PLA matrix up to 30 wt% cellulose fiber content. Overall it was concluded that recycled cellulose fibers from newsprint could be a potential reinforcement for the high performance biodegradable polymer composites.
