Thermal Conductivity Measurements of Nylon 11-Carbon Nanofiber Nanocomposites

Moore, Arden L.; Cummings, Antonette T.; Jensen, Justin M.; Shi, Li; Koo, Joseph H.

doi:10.1115/1.3139110

Cited by 21 publications

(22 citation statements)

References 15 publications

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“…. This interfacial thermal resistance was within range of the interfacial resistance reported for Nylon 11‐carbon nanofiber composites . Thus, the overall low thermal conductivities of the mats were expected to be primarily due to the high interfacial resistances between the nanofibers.…”

Section: Resultssupporting

confidence: 74%

Thermal conductivities of electrospun polyimide‐mesophase pitch nanofibers and mats

Yan

Mahanta

Majerus

et al. 2013

Polymer Engineering & Sci

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In this article, we report the preparation and thermal properties of polyimide-mesophase pitch (MP) composite nanofibers and associated nanofiber nonwoven mats produced using an electrospinning process. The addition of MP increased the thermal conductivities of both the individual composite nanofibers and the inplane conductivities of the nanofiber mats. The out-ofplane conductivity of the mats remained relatively low due to low through thickness connectivity between the nanofibers. These nanofiber mats are flexible and very thin and are good candidates for thermal management films for future flexible electronic devices. POLYM. ENG. SCI., 54:977-983,

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Section: Resultssupporting

confidence: 74%

Thermal conductivities of electrospun polyimide‐mesophase pitch nanofibers and mats

Yan

Mahanta

Majerus

et al. 2013

Polymer Engineering & Sci

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“…Nonetheless, given that the volume fractions used in the calculations were determined from experimentally measured densities of the samples, the only plausible explanation for such a theoretical under-prediction at these distinct ratios is that the interface resistance is lower than the value used in the analysis (;10 À6 m 2 K/W). 42 Similarly, previous studies dealing with the combinations of fillers attribute an abrupt increase in thermal conductivity for certain relative concentrations 31,32 to the nanoscale fillers bridging the gaps between the GNPs. In other words, the nanoscale fillers adhere to the graphite flakes and provide a "fin-like" structure to the surface of the graphite, providing a larger contact area and an additional thermal path, thus lowering the thermal resistance.…”

Section: Thermal Conductivity Measurement Results and Discussionmentioning

confidence: 90%

“…The average lateral dimensions used in the analysis were 500 and 5 lm for graphite and graphene, respectively, and were taken from information presented in vendor data sheets. The value of the interface thermal resistance, R K % 10 À6 m 2 K/W, was taken from the study of Moore et al 42 concerning carbon nanofibers and nylon-11 composites. This value was chosen over the other values (8 Â 10 À8 m 2 K/W for CNT/CNT interfaces 28 and 3.7 Â 10 À9 m 2 K/W for graphene/graphene interfaces 27 ) because it represents the resistance at filler/matrix interfaces, whereas the latter are only applicable for filler/filler interfaces.…”

Section: Thermal Conductivity Measurement Results and Discussionmentioning

confidence: 99%

Graphite–graphene hybrid filler system for high thermal conductivity of epoxy composites

et al. 2015

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The thermal conductivities of epoxy composites of mixtures of graphite and graphene in varying ratios were measured. Thermal characterization results showed unexpectedly high conductivities at a certain ratio filler ratio. This phenomenon was exhibited by samples with three different overall filler concentrations (graphene 1 graphite) of 7, 14, and 35 wt%. The highest thermal conductivity of 42.4 6 4.8 W/m K (nearly 250 times the thermal conductivity of pristine epoxy) was seen for a sample with 30 wt% graphite and 5 wt% graphene when characterized using the dual-mode heat flow meter technique. This significant improvement in thermal conductivity can be attributed to the lowering of overall thermal interface resistance due to small amounts of nanofillers (graphene) improving the thermal contact between the primary microfillers (graphite). The synergistic effect of this hybrid filler system is lost at higher loadings of the graphene relative to graphite. Graphite and graphene mixed in the ratio of 6:1 yielded the highest thermal conductivities at three different filler loadings.

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“…Cross-linking restricts mobility of the polymeric chains, which ultimately delays the decomposition of the materials. A previous study [16] on CNF-reinforced polymer composite has revealed that reinforcement of CNFs, even with small weight percent, improve the thermal conductivity of the material. Therefore, it is also expected for this study that thermal conductivity of the polymer has improved specifically with 2 wt % loading of CNFs, which could be the reason that by dispersing 2 wt % CNFs, thermal stability of the material has improved, as heat dissipates more quickly at 2 wt % loading of CNFs.…”

Section: Thermal Gravimetric Analysismentioning

confidence: 98%

Processing and Characterization of Space-Durable High-Performance Polymeric Nanocomposite

Iqbal¹,

Bhowmik²,

Benedictus³

et al. 2011

Journal of Thermophysics and Heat Transfer

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In this investigation, efforts were given to develop carbon-nanofiber-reinforced polybenzimidazol nanocomposite for space application. Processing of polybenzimidazol was carried out by using polybenzimidazol in powder and solution forms. Thermomechanical properties of compression-molded polybenzimidazol, unfilled polybenzimidazol films, and nanofiber-reinforced polybenzimidazol films were investigated using thermogravimetric analysis, dynamic mechanical analysis, and tensile testing. Thermogravimetric analysis revealed that both compressionmolded polybenzimidazol and polybenzimidazol films show high thermal stability. Dynamic mechanical analysis studies depicted that both compression-molded polybenzimidazol and polybenzimidazol neat films exhibited a high storage modulus, even at a temperature of 250 C. Polybenzimidazol nanocomposite films were cast with different loadings of carbon nanofibers from 0.5 to 2 wt % in polymer solution. Addition of carbon nanofibers improved the thermal stability and storage modulus of polybenzimidazol film. Mechanical testing showed that both compressionmolded polybenzimidazol and polybenzimidazol films resulted in the highest ultimate tensile strength in comparison to any unfilled polymer. Investigation under scanning electron microscopy confirmed uniform dispersion of carbon nanofibers in polymer solution. Analysis of fractured surfaces revealed that neat polybenzimidazol film exhibited ductile failure and dispersion of carbon nanofibers into the polybenzimidazol, resulting in transformation from ductile to brittle failure.

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Thermal Conductivity Measurements of Nylon 11-Carbon Nanofiber Nanocomposites

Cited by 21 publications

References 15 publications

Thermal conductivities of electrospun polyimide‐mesophase pitch nanofibers and mats

Thermal conductivities of electrospun polyimide‐mesophase pitch nanofibers and mats

Graphite–graphene hybrid filler system for high thermal conductivity of epoxy composites

Processing and Characterization of Space-Durable High-Performance Polymeric Nanocomposite

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