Thermal conductivity of electrospinning chain-aligned polyethylene oxide (PEO)

Lu, Chenhao; Chiang, Sum Wai; Du, Hongda; Li, Jia; Gan, Lin; Zhang, Xing; Chu, Xiangxiang; Yao, Youwei; Li, Baohua; Kang, Feiyu

doi:10.1016/j.polymer.2017.02.024

Cited by 102 publications

(58 citation statements)

References 36 publications

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“…Absorption bands were observed at 2878 cm À1 , 1464 cm À1 and 1345 cm À1 in the spectrum of PTEO51corresponding to the stretching, bending and wagging vibration modes of the CH 2 groups present in PEO, respectively. 17 The two bands observed at 1097 cm À1 and 958 cm À1 corresponded to the C-O-C stretching and the CH 2 rocking modes in PEO (Fig. 4a).…”

Section: Physicochemical Properties Of Ptfe Nanobrous Membranesmentioning

confidence: 96%

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Fabrication of polytetrafluoroethylene nanofibrous membranes for guided bone regeneration

et al. 2018

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Section: Physicochemical Properties Of Ptfe Nanobrous Membranesmentioning

confidence: 96%

“…The XRD pattern of PTEO51 precursor membrane showed peaks attributed to the PEO crystalline phase at 16.8 and 25.5 , which were indexed to the (120) and (112) planes, respectively. 17 In addition, diffraction peaks ascribed to the PTFE crystalline phase were (Fig. 5a).…”

Section: Physicochemical Properties Of Ptfe Nanobrous Membranesmentioning

confidence: 99%

Fabrication of polytetrafluoroethylene nanofibrous membranes for guided bone regeneration

et al. 2018

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“…The first parameter is the strength of the electric field during the electrospinning process. 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.…”

Section: Electrospinningmentioning

confidence: 99%

Thermal conductivity of polymers and polymer nanocomposites

Huang

Qian

Yang

2018

Materials Science and Engineering: R: Reports

640

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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“…As a result, thermally conductive polymeric composite materials utilizing carbonous fillers such as reduced graphene oxide or inorganic fillers such as boron nitride (BN) have been investigated in a range of application including self‐healing resins, electronic packaging, ultra‐high voltage electrical devices, and energy storage field . Alternatively, electrospun polyethylene fibers and carbon fibers have also been investigated as thermally conductive substrates.…”

Section: Specific Heat Capacities At 30 °C and Densities Of Pu And Bmentioning

confidence: 99%

“…The PU solution in EtOH/water (85:15 v/v) showed a significantly lower drop in viscosity by shear force compared to that of the PU solution in EtOH/water (95:5 v/v) at the same PU concentration. This indicated that dissolving PU in EtOH/water (85:15 v/v) resulted in a less intertwined solution with reduced decay of viscosity by shear force . Therefore, the mixture of EtOH/water (85:15 v/v) was chosen as the preferred solvent for producing PU and BNNP/PU composites, with loadings of BNNP at 0.5, 1, 2, and 5 w/w%.…”

Section: Specific Heat Capacities At 30 °C and Densities Of Pu And Bmentioning

confidence: 99%

Processable Thermally Conductive Polyurethane Composite Fibers

Farajikhah

Amber

Sayyar

et al. 2018

Macro Materials & Eng

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In recent decades there has been a significant focus upon the incorporation of electronic components into textiles and wearable garments for functionalities such as sensing, health, environment monitoring, and energy storage. [1][2][3][4][5][6][7] Owing to the rapid development of nanoscience and technology, it is now possible to build electronic functions inside of, or on the surface of, fibers and consequently incorporate them into a garment structure using well-established textile fabrication techniques. [1] As a result of the ever-increasing demand for wearable electronics, research has focused on the development of electrically conductive fibers for applications including strain sensing, energy storage, and electrical wiring. [8][9][10][11][12] Heat removal and heat management in microelectronics is now becoming important in light of the ever-growing demand for miniaturization and development of wearable electronics. [13] As a result, thermally conductive polymeric composite materials utilizing carbonous fillers such as reduced graphene oxide [14] or inorganic fillers such as boron nitride (BN) [15][16][17][18][19] have been investigated in a range of application including self-healing resins, electronic packaging, ultrahigh voltage electrical devices, and energy storage field. [14,[16][17][18][19][20] Alternatively, electrospun polyethylene fibers [21] and carbon fibers [22] have also been investigated as thermally conductive substrates.In this study, processable thermally conductive composite fibers have been produced utilizing a solvent-based polymerfiller solution mixing method from which fibers were produced via a wet-spinning (solvent/non-solvent) technique. [23] Non-cross-linked polyurethane (PU) was selected as it exhibits similar mechanical properties to that of rubber, whilst being thermally and solvent-processable. The combination of high elasticity along with high abrasion resistance makes PU very popular for a wide range of applications. [24] In addition, noncross-linked PU is readily soluble in organic solvents, from which composite structures with different fillers can be readily produced. [5,8,9,25] Boron nitride, also known as white graphite, is an isoelectronic with carbon and has a wide range of attractive properties such as high thermal conductivity, low coefficient of thermal expansion, high electrical resistivity over a wide temperature range, high temperature stability, high mechanical strength and hardness, and chemically and thermally stable Thermally Conductive FibersThe demand for wearable electronics has resulted in an increasing interest in the development of functional fibers, with a specific focus upon the development of electrically conductive fibers incorporable into garments. However, the production of thermally conductive fibers for heat dissipation has been largely neglected. Owing to the very rapid development of miniaturized wearable electronics, there is an increasing need for the development of thermally conductive fibers as heat sinks and thermal management processes....

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Thermal conductivity of electrospinning chain-aligned polyethylene oxide (PEO)

Cited by 102 publications

References 36 publications

Fabrication of polytetrafluoroethylene nanofibrous membranes for guided bone regeneration

Fabrication of polytetrafluoroethylene nanofibrous membranes for guided bone regeneration

Thermal conductivity of polymers and polymer nanocomposites

Processable Thermally Conductive Polyurethane Composite Fibers

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