Design and fabrication of morphologically controlled carbon nanotube/polyamide-6-based composites as electrically insulating materials having enhanced thermal conductivity and elastic modulus

Morishita, Takuya; Katagiri, Yoshihide; Matsunaga, Takuro; Muraoka, Yoshimi; Fukumori, Kenzo

doi:10.1016/j.compscitech.2017.01.022

Cited by 48 publications

(16 citation statements)

References 37 publications

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“…The breakdown strength and thermal conductivity of such blends are enhanced due to the incorporation of BNNS in SEBS phase. While Morishita et al have successfully controlled the morphology of PA6/poly(phenylene sulfide) (PPS) blends containing MWNTs through using poly(ethylene‐co‐glycidyl methacrylate) and (3‐glycidyloxypropyl)trimethoxysilane (GOPTS). In blends containing GOPTS, MWNTs were end‐capped with PPS domains to prohibit the formation of conductive networks, and these PPS domains in nanometer size were homogeneously dispersed in PA6 matrix.…”

Section: Confinementmentioning

confidence: 99%

Recent Progress on the Confinement, Assembly, and Relaxation of Inorganic Functional Fillers in Polymer Matrix during Processing

Deng

2017

Macromol. Rapid Commun.

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Therefore, one of the key challenges for the preparation of functional polymer composites is how to achieve optimum functionalities with minimum amount of filler, or, how to improve the effective contribution from these fillers to the final functionalities of these composites. It should also be noted that it is indeed very difficult to obtain nanocomposites with good filler dispersion, good compatibility, and good interfacial behavior while inorganic filler is added into polymer.In most cases, small parts of inorganic functional fillers are surrounded by polymer chains in the composites, where polymer chains account for the majority volume of the composites. Thus, the confinement, assembly, and relaxation of inorganic fillers are primarily determined by surrounding polymer chains and external field selectively applied on filler. For instance, as shown in Figure 1, inorganic fillers could be confined in polymer blends, where filler could locate in one of the polymer phases or their interface. Meanwhile, shear applied during solid state drawing or other processes could orient polymer chains and inorganic fillers due to confinement from shear field. In terms of assembly, inorganic fillers could assemble into network under external electrical or magnetic field. In some cases, such assemble behavior could also be observed in polymer melt or solution. Regarding relaxation, it is often caused by the relaxation or disorientation of surrounding polymer chains after strong external shear field. It should be noted that such relaxation behavior is more likely to occur on intrinsic flexible fillers than rigid ones. To better control filler network morphology, above three issues can be considered independently or collectively through the use of one or a combination of a number of specific methods.Different functionalities may have different requirements for their respective inorganic functional filler network. Thus, related research on specific functional polymer composites may have been focused on several aspects of filler network morphological control, and ignoring others. Thus, a systematic review on different morphological control methods on filler network is urgently needed to achieve an extensive review on the "tool box" for better and more systematic morphological control of functional filler networks. Following review will be carried out by discussing recent progress on the confinement, assembly, and relaxation of various functional inorganic fillers in polymer The confinement, assembly, and relaxation of inorganic functional fillers in polymers are thought as the basic issues related to such control. Processing as the means to achieve the desired shape and properties for materials often involves strong temperature and shear field, among other factorsnot to mention the complex interaction between polymer and filler. These processing fields and interactions during processing are reported to have profound influence on the confinement, assembly, and relaxation of inorganic fillers in polymer matrix. Therefore, various fu...

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Section: Confinementmentioning

confidence: 99%

Recent Progress on the Confinement, Assembly, and Relaxation of Inorganic Functional Fillers in Polymer Matrix during Processing

Deng

2017

Macromol. Rapid Commun.

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“…Nowadays, polymeric materials play an increasingly important role in everyday life due to their lightweight density, low cost, and superior mechanical properties. Polymer‐based composites with high thermal conductivity (TC) have a great demand in the field of electronic devices to meet the requirement for efficient heat removal and dissipation . Since conventional polymers have a poor TC from 0.1 W (m −1 K −1 ) to 0.3 W (m −1 K −1 ), the addition of filler with ultrahigh TC is a common way to improve TC.…”

Section: Introductionmentioning

confidence: 99%

In situ Polymerization of Polyamide 6/Boron Nitride Composites to Enhance Thermal Conductivity and Mechanical Properties via Boron Nitride Covalently Grafted Polyamide 6

Fang

et al. 2020

Polymer Engineering & Sci

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Polyamide 6/boron nitride (PA6/BN) composites were synthesized via anionic ring‐opening polymerization using ε‐caprolactam as the monomer and functional boron nitride (f‐BN) as the thermal conductive filler. Besides the homopolymerized PA6, some PA6 molecule chains would grow from the f‐BN sheets through the “grafting from” strategy. Compared with unfunctional hexagonal BN (h‐BN), the introduction of f‐BN not only improved the dispersion of f‐BN in the matrix but also enhanced the interface bonding between f‐BN and PA6. The homogeneous dispersion of f‐BN in the PA6/f‐BN composite favored the formation of the continuous thermal conductive paths or network at a low f‐BN loading, and the good interface bonding reduced the phonon scattering in the interface, which improved the thermal conductivity (TC) of the PA6/f‐BN composite by 66.0% compared with that of the pure PA6, when only 5 wt% f‐BN was added. In contrast, with the same content of unfunctional h‐BN loading, the TC of the corresponding composite merely improved by 29.7%. Moreover, Young's modulus and yield strength of PA6/f‐BN composites had increased obviously with the introduction of f‐BN, whereas those of PA6/h‐BN composites showed small fluctuation with the same contents of BN. POLYM. ENG. SCI., 60:710–716, 2020. © 2020 Society of Plastics Engineers

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“…Combinations of polymers and CNTs can therefore be expected to lead to enhanced mechanical strength and tensile modulus as well as superior electrical properties . Furthermore, the enhanced thermal conductivity and good electrical insulation of polymer/CNT blend could also be achieved, in addition to a much higher elastic modulus and heat resistance . However, the effectiveness of CNTs in polymer matrices is greatly dependent on the degree of nanoscale dispersion and the development of a strong interface/interphase .…”

Section: Introductionmentioning

confidence: 99%

Poly(amino acid)/carbon nanotube nanocomposites with enhanced thermal, electrical, and mechanical properties

2018

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Poly(amino acid) (PAA)‐based nanocomposites were synthesized by in situ melting polycondensation with various carbon nanotube (CNT) loadings; the morphology, thermal, mechanical, electrical, and biocompatible properties of the resulting nanocomposites were investigated and characterized. The nanotubes were dispersed within the polymer matrix without the need for coupling agents or surfactants. The crystallization temperature showed a gradual rise with increasing CNT loading, confirming that the nanotubes act as nucleating agents for PAA crystallization. The nanotubes increased the thermal stability of the matrix, leading to an increase in the initial degradation temperature (Ti) and the maximum degradation temperature (Tm). The mechanical properties were gradually enhanced by increasing the CNT content except for the property of elongation at break, which showed its highest value at 1 wt% CNT content. The nanocomposites showed better electrical and biocompatible properties than CNT‐free PAA, suggesting that the incorporation of CNTs is effective for improving the PAA performance, and the nanocomposites are suitable as performance materials for the manufacture of medical apparatus. POLYM. COMPOS., 39:E1939–E1949, 2018. © 2018 Society of Plastics Engineers

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Design and fabrication of morphologically controlled carbon nanotube/polyamide-6-based composites as electrically insulating materials having enhanced thermal conductivity and elastic modulus

Cited by 48 publications

References 37 publications

Recent Progress on the Confinement, Assembly, and Relaxation of Inorganic Functional Fillers in Polymer Matrix during Processing

Recent Progress on the Confinement, Assembly, and Relaxation of Inorganic Functional Fillers in Polymer Matrix during Processing

In situ Polymerization of Polyamide 6/Boron Nitride Composites to Enhance Thermal Conductivity and Mechanical Properties via Boron Nitride Covalently Grafted Polyamide 6

Poly(amino acid)/carbon nanotube nanocomposites with enhanced thermal, electrical, and mechanical properties

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