Measuring thermal conductivity of polystyrene nanowires using the dual-cantilever technique

Canetta, Carlo; Guo, Samuel X.; Narayanaswamy, Arvind

doi:10.1063/1.4896330

Cited by 40 publications

(22 citation statements)

References 42 publications

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“…It is reported that strengthening the electric field is beneficial to enhance the chain alignment, and thus the thermal conductivity of the electrospun PE nanofibers 10 [26,27]. According to the degree of polymer chain alignment in an electrospun fiber, Canetta et al [28] summarized the possible orientations of the chains in a polymer as shown in Fig. 6.…”

Section: Electrospinningmentioning

confidence: 99%

“…(b) a core-shell morphology with the shell formed by aligned chains and core comprised of randomly oriented chains; (c) a super-molecular morphology with aligned-chain grains filled in a randomly oriented chain matrix. [28] Copyright 2014 American Institute of Physics. Figure 7 shows the enhanced thermal conductivity of polymers with chain alignment through different processing techniques.…”

Section: Fig 6 Orientations Of Polymer Chains: (A) a Nanofiber With mentioning

confidence: 99%

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Thermal conductivity of polymers and polymer nanocomposites

Huang

Qian

Yang

2018

Materials Science and Engineering: R: Reports

643

391

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Polymers are widely used in industry and in our daily life because of their diverse functionality, light weight, low cost and excellent chemical stability. However, on some applications such as heat exchangers and electronic packaging, the low thermal conductivity of polymers is one of the major technological barriers. Enhancing the thermal conductivity of polymers is important for these applications and has become a very active research topic over the past two decades. In this review article, we aim to: 1). systematically summarize the molecular level understanding on the thermal transport mechanisms in polymers in terms of polymer morphology, chain structure and inter-chain coupling; 2). highlight the rationales in the recent efforts in enhancing the thermal conductivity of nanostructured polymers and polymer nanocomposites. Finally, we outline the main advances, challenges and outlooks for highly thermal-conductive polymer and polymer nanocomposites. the inter-chain coupling. Fig. 1 Schematic diagrams of a polymer: (a) the morphology of a polymer consisting of crystalline and amorphous domains; (b) structure of a polymer chain.In addition to engineering the morphology of polymer chains, another common method to enhance the thermal conductivity of polymers is to blend polymers with highly thermal conductive fillers. The progress of nanotechnology over the last two decades not only provides more diverse high thermal conductivity fillers of different material types and topological shapes but also advances the understanding at the nanoscale. Fig. 2 shows a sketch of a polymer nanocomposite to illustrate the thermal transport mechanisms. In general, there are two types of polymer nanocomposites depending on whether nano-fillers form a network or not. When the filler concentration is low, no inter-filler networks could be formed, as shown in Fig. 2(a). The thermal conductivity is essentially determined by the filler-matrix coupling, i.e, interfacial thermal resistance, and the concentration and the geometric shapes of fillers. When the filler concentration is large enough, high conductivity fillers might form thermally conductive networks, as shown in Fig. 2(b). Although nanocomposites with filler network could possess a higher thermal conductivity than that without a network, their thermal conductivity could still be low due to the large inter-filler thermal contact resistance. Recently, three-dimensional fillers, such as carbon and graphene foams, have drawn a lot of attention. The fundamental thermal transport mechanisms and recent synthesis efforts in both types of nanocomposites are reviewed.This review article is organized as follows. In Section 2, we introduce the experimental progress on the enhancement of thermal conductivity by aligning polymer chains, and then review the methods to further tune the thermal conductivity by engineering chain structure and inter-chain coupling, as illustrated in Fig. 3(a). In Section 3, we discuss the thermal conductivity of polymer nanocomposites both with and without inter...

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Section: Electrospinningmentioning

confidence: 99%

Section: Fig 6 Orientations Of Polymer Chains: (A) a Nanofiber With mentioning

confidence: 99%

Thermal conductivity of polymers and polymer nanocomposites

Huang

Qian

Yang

2018

Materials Science and Engineering: R: Reports

643

391

View full text Add to dashboard Cite

show abstract

“…A variety of methods, such as 3ω method 23 24 , Raman spectroscopy 25 26 27 , and cantilever techniques 13 28 , can be used to characterize the thermal properties of materials in micro/nano scale. In our experiment, because PSQ crystals are in regular beam shapes, a suspended micro thermal device is implemented to characterize the thermal properties 29 30 31 .…”

Section: Resultsmentioning

confidence: 99%

Tunable Thermal Transport in Polysilsesquioxane (PSQ) Hybrid Crystals

Yang

Zhang

et al. 2016

Sci Rep

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Crystalline polymers have attracted significant interest in recent years due to their enhanced mechanical and thermal properties. As one type of organic-inorganic hybrid polymer crystals, polysilsesquioxane can be synthesized by large-scale and inexpensive so-gel processes with two precursors. In this paper, both octylene-bridged and hexylene-bridged PSQ crystals are characterized with infrared spectroscopy and X-ray crystallography to reveal their super high crystallinity. To study the thermal transport in these unique polymer crystals, we use a suspended micro thermal device to examine their thermal properties from 20 K to 320 K, and demonstrate their tunable thermal conductivity by varying the length of alkyl chains. We also conduct non-equilibrium molecular dynamics simulations to study the phonon behaviors across the hydrogen bond interface. The simulation results demonstrate good agreement with the experimental results regarding both the value and trend of the PSQ thermal conductivity. Furthermore, from the simulation, we find that the anharmonic phonon scattering and interfacial anharmnic coupling effects across the hydrogen bond interface may explain the experimentally observed thermal properties.

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“…It has been reported that the alignment of polymer chains by electrospinning can achieve a 20-fold enhancement of the thermal conductivity. 116 Recently, electrospun CdSe/ZnS QDs-PS hybrid nanofibers have been prepared and packaged on chip on board (CoB) LEDs. 113 In comparison to the traditional QDs-PS membrane, the CdSe/ZnS QDs-PS hybrid nanofibers membrane shows an enhancement of around 55.4% and 481.3% for the through-panel and in-panel thermal diffusivities, respectively.…”

Section: Diodesmentioning

confidence: 99%