Novel Polyethylene Fibers of Very High Thermal Conductivity Enabled by Amorphous Restructuring

Zhu, Bowen; Liu, Jing; Wang, Tianyu; Han, Meng; Valloppilly, Shah R.; Xu, Shen; Wang, Xinwei

doi:10.1021/acsomega.7b00563

Cited by 101 publications

(65 citation statements)

References 40 publications

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“…4(b). The thermal conductivity of a thermally stretched UHMW-PE microfiber approaches 51 W·m -1 ·K -1 , while its crystallinity is reduced from 92% to 83% during the stretching [20]. Such increased thermal conductivity is due to the improved chain alignment in the amorphous domains.…”

Section: Mechanical Stretchingmentioning

confidence: 98%

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Thermal conductivity of polymers and polymer nanocomposites

Huang

Qian

Yang

2018

Materials Science and Engineering: R: Reports

670

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: Mechanical Stretchingmentioning

confidence: 98%

“…Copyright 2010 Nature Publishing Group; (b) influence of crystalline in UHMW-PE. [20] Copyright 2017 American Chemical Society; (c) Tensile effects on thermal transport in carbine and cumulene [23]. copyright 2015 Nature Publishing Group.…”

Section: Mechanical Stretchingmentioning

confidence: 99%

Thermal conductivity of polymers and polymer nanocomposites

Huang

Qian

Yang

2018

Materials Science and Engineering: R: Reports

670

391

View full text Add to dashboard Cite

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“…It was reported that the armchair and zigzag thermal conductivities were 23-33 and 73-93 W m À1 K À1 , respectively. 16 There are other techniques that can be used for studying the anisotropic thermal conductivity of BP, such as the modified laser-flash technique, 19 pulsed laser-assisted thermal relaxation technique, 20 transient electro-thermal technique, [21][22][23][24] etc.…”

Section: Introductionmentioning

confidence: 99%

Characterization of anisotropic thermal conductivity of suspended nm-thick black phosphorus with frequency-resolved Raman spectroscopy

Wang

Han

Wang

et al. 2018

Journal of Applied Physics

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Frequency-resolved Raman spectroscopy (FR-Raman) is a new technique for nondestructive thermal characterization. Here, we apply this new technique to measure the anisotropic thermal conductivity of suspended nm-thick black phosphorus samples without the need of optical absorption and temperature coefficient. Four samples with thicknesses between 99.8 and 157.6 nm are studied. Based on steady state laser heating and Raman measurement of samples with a specifically designed thermal transport path, the thermal conductivity ratio (j ZZ /j AC) is determined to be 1.86-3.06. Based on the FR-Raman measurements, the armchair thermal conductivity is measured as 14-22 W m À1 K À1 , while the zigzag thermal conductivity is 40-63 W m À1 K À1. FR-Raman has great potential for studying the thermal properties of various nanomaterials. This study significantly advances our understanding of thermal transport in black phosphorus and facilitates the application of black phosphorus in novel devices.

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“…In addition, a resulting (010) peak was also found in UHMWPE fibers after hot drawing process. [43] This peak indicates that monoclinic/triclinic crystals have emerged and coexist with the dominant orthorhombic form.…”

Section: Morphologymentioning

confidence: 99%

Self‐assembled fibrillar polyethylene crystals with tunable properties

Seyhan

Günaydın

Polat

et al. 2020

Polymer Engineering & Sci

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Due to its simple linear chain structure, crystal morphology of linear low‐density polyethylene (LLDPE) fibers can be controlled to fulfill the needs of diverse advanced applications. This study presents a simple two‐step method to produce LLDPE fibers with self‐assembled fibrillar crystals and highly oriented amorphous phase. Rather than conventional melt spinning, fibers were treated in a two‐step eco‐friendly bath without drawing after extruded fibers emerge from the spinneret. Treated fibers through the baths demonstrated lower crystallinity, but significantly higher degree of crystal orientation when compared to control fibers of traditional melt spinning. Morphological analysis revealed that a unique microstructure was formed after spinning through a two‐step eco‐friendly bath. As‐spun fibers demonstrated spherulitic morphology which can be transformed into a fibrillar structure followed by post‐drawing process. Cross sectional images of the treated LLDPE fibers produced at 400 m/min showed fibrillar PE crystals which can be more dominant upon post‐drawing. After two‐step bath treatment, produced fibers need low draw ratios to exhibit high performance. Our novel modification followed by hot drawing process can manipulate internal structure with performance of PE fibers to an outstanding level of 0.35 GPa strength and 3 GPa modulus at a production speed of 400 m/min.

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Novel Polyethylene Fibers of Very High Thermal Conductivity Enabled by Amorphous Restructuring

Cited by 101 publications

References 40 publications

Thermal conductivity of polymers and polymer nanocomposites

Thermal conductivity of polymers and polymer nanocomposites

Characterization of anisotropic thermal conductivity of suspended nm-thick black phosphorus with frequency-resolved Raman spectroscopy

Self‐assembled fibrillar polyethylene crystals with tunable properties

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