Study on the performance of syntactic foam reinforced by hybrid functionalized carbon nanotubes

Ya, Bin; Wang, Yaosheng; Meng, Linggang; Zhou, Bingwen; Zhang, Xingguo

doi:10.1002/app.48586

Cited by 15 publications

(10 citation statements)

References 15 publications

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“…The resulting materials show higher tensile, higher compressive, and higher impact properties per unit weight than traditional foams, but also higher heat insulation performance, dielectric properties, flame resistance, and sound absorption capacity [ 1 ]. This unique combination of properties justifies the intensive research and application of syntactic foams in high-end and weight-sensitive areas, especially in the fields of transportation, aerospace, and marine fields where syntactic foams are employed to produce thermal insulating panels, stiff lightweight cores in composite sandwich structures, deep-sea pipelines, and other diving equipment [ 2 , 3 , 4 , 5 , 6 , 7 ].…”

Section: Introductionmentioning

confidence: 99%

“…For example, the thermal conductivity of polymeric SFs can either increase or decrease with the HGM concentration depending on the ratio between the volume and the wall thickness of hollow spheres [ 15 ]. Such remarkable versatility can be further enhanced by adding a third constituent [ 3 ]. The property set of epoxy/HGM SFs has been extended by incorporating microfillers and nanofillers such as milled carbon fibers and carbon nanofibers (CNFs), expanded graphene nanoplatelets (xGnPs), nanoclays, and halloysite nanotubes.…”

Section: Introductionmentioning

confidence: 99%

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Thermophysical Properties of Multifunctional Syntactic Foams Containing Phase Change Microcapsules for Thermal Energy Storage

Galvagnini¹,

Dorigato²,

Fambri³

et al. 2021

Polymers

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Syntactic foams (SFs) combining an epoxy resin and hollow glass microspheres (HGM) feature a unique combination of low density, high mechanical properties, and low thermal conductivity which can be tuned according to specific applications. In this work, the versatility of epoxy/HGM SFs was further expanded by adding a microencapsulated phase change material (PCM) providing thermal energy storage (TES) ability at a phase change temperature of 43 °C. At this aim, fifteen epoxy (HGM/PCM) compositions with a total filler content (HGM + PCM) of up to 40 vol% were prepared and characterized. The experimental results were fitted with statistical models, which resulted in ternary diagrams that visually represented the properties of the ternary systems and simplified trend identification. Dynamic rheological tests showed that the PCM increased the viscosity of the epoxy resin more than HGM due to the smaller average size (20 µm vs. 60 µm) and that the systems containing both HGM and PCM showed lower viscosity than those containing only one filler type, due to the higher packing efficiency of bimodal filler distributions. HGM strongly reduced the gravimetric density and the thermal insulation properties. In fact, the sample with 40 vol% of HGM showed a density of 0.735 g/cm3 (−35% than neat epoxy) and a thermal conductivity of 0.12 W/(m∙K) (−40% than neat epoxy). Moreover, the increase in the PCM content increased the specific phase change enthalpy, which was up to 68 J/g for the sample with 40 vol% of PCM, with a consequent improvement in the thermal management ability that was also evidenced by temperature profiling tests in transient heating and cooling regimes. Finally, dynamical mechanical thermal analysis (DMTA) showed that both fillers decreased the storage modulus but generally increased the storage modulus normalized by density (E′/ρ) up to 2440 MPa/(g/cm3) at 25 °C with 40 vol% of HGM (+48% than neat epoxy). These results confirmed that the main asset of these ternary multifunctional syntactic foams is their versatility, as the composition can be tuned to reach the property set that best matches the application requirements in terms of TES ability, thermal insulation, and low density.

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Thermophysical Properties of Multifunctional Syntactic Foams Containing Phase Change Microcapsules for Thermal Energy Storage

Galvagnini¹,

Dorigato²,

Fambri³

et al. 2021

Polymers

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“…The bisphenol A epoxy acrylate is a typical UV-sensitive material with good hardness, gloss, heat resistance, and chemical stability after curing. [16,17] Figure 1 is the photopolymerization strategy of photosensitive resin; the photosensitive resin parameters after curing are shown in Table 1.…”

Section: Experiments 21 | Materials and Sample Preparationmentioning

confidence: 99%

Study on the liquid crystal display mask photo‐curing of photosensitive resin reinforced with graphene oxide

Xie

et al. 2020

J of Applied Polymer Sci

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Graphene oxide has the characteristics of high specific surface area, high strength, and high modulus. The tensile and compressive properties of the cured resin part can be reinforced after the graphene oxide is mixed into the photosensitive resin. A self‐developed liquid crystal display (LCD) mask photo‐curing machine is adopted to prepare photosensitive resin parts mixed with graphene oxide. The influence of graphene oxide content on the surface roughness, tensile, and compressive properties of the cured resin is analyzed by the combination of finite element simulation and experiment. It is concluded that the accumulation of graphene oxide is the main reason affecting the tensile and compressive properties of the cured part. By applying ultrasonic vibration and extending the time of magnetic stirring at 80°C, the dispersion uniformity of graphene oxide is improved, the agglomeration of graphene oxide is reduced, and the tensile and compressive strength of cured parts are strengthened.

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“…Generally, high HGM concentrations and thin shells result in materials with low density but limited stiffness and mechanical and impact strength, while the specific (i.e., normalized by density) mechanical properties often increase with the HGM volume fraction [42][43][44]. The property set of these SFs can be further expanded by incorporating a third phase, such as short carbon or glass fibers, carbon nanotubes, and nanoclays, which can enhance the fracture toughness by modifying the packing density of HGMs, and can add other functional properties such as thermal conductivity and electromagnetic interference (EMI) shielding capability [33,45,46].…”

Section: Introductionmentioning

confidence: 99%

Mechanical Behaviour of Multifunctional Epoxy/Hollow Glass Microspheres/Paraffin Microcapsules Syntactic Foams for Thermal Management

et al. 2021

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Epoxy/hollow glass microsphere (HGM) syntactic foams (SFs) are peculiar materials developed to combine low density, low thermal conductivity, and elevated mechanical properties. In this work, multifunctional SFs endowed with both structural and thermal management properties were produced for the first time, by combining an epoxy matrix with HGM and a microencapsulated phase change material (PCM) having a melting temperature of 43 °C. Systems with a total filler content (HGM + PCM) up to 40 vol% were prepared and characterized from the mechanical point of view with a broad experimental campaign comprising quasi-static, impact, and fracture toughness tests. The experimental results were statistically treated and fitted with a linear model, to produce ternary phase diagrams to provide a comprehensive interpretation of the mechanical behaviour of the prepared foams. In quasi-static tests, HGM introduction helps to retain the specific tensile elastic modulus and to increase the specific compressive modulus. The brittle nature of HGMs decreases the Charpy impact properties of the SFs, while the PCM insertion improve their toughness. This result is confirmed in KIC and GIC tests, where the composition with 20 vol% of PCM shows an increase of 80% and 370% in KIC and GIC in to neat epoxy, respectively. The most promising compositions are those combining PCM and HGMs with a total particle volume fraction up to 40 vol%, thanks to their optimal combination of thermal management capability, lightness, thermal insulation, and mechanical properties. The ability to fine-tune the properties of the SFs, together with the acquired thermal energy storage (TES) capability, confirm the great potential of these multifunctional materials in automotive, electronics, and aerospace industries.

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Study on the performance of syntactic foam reinforced by hybrid functionalized carbon nanotubes

Cited by 15 publications

References 15 publications

Thermophysical Properties of Multifunctional Syntactic Foams Containing Phase Change Microcapsules for Thermal Energy Storage

Thermophysical Properties of Multifunctional Syntactic Foams Containing Phase Change Microcapsules for Thermal Energy Storage

Study on the liquid crystal display mask photo‐curing of photosensitive resin reinforced with graphene oxide

Mechanical Behaviour of Multifunctional Epoxy/Hollow Glass Microspheres/Paraffin Microcapsules Syntactic Foams for Thermal Management

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