Isothermal Crystallization Properties of Polyamide 6 / Hexagonal Boron Nitride Nanocomposites

Wu, Xiang-Feng; Zhao, Yongke; Li, Xiaojun; Wang, Yijin; Zhang, Chenxu; Su, Jun-Zhang; Zhang, Jiarui; Wang, Kaiyuan; Wang, Yiwei; Zhang, Mi

doi:10.1080/00222348.2017.1413832

Cited by 4 publications

(3 citation statements)

References 19 publications

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“…With an increase in the filler fraction, the melt crystallization temperature ( T c ) increases from 118.1 °C for neat PE to 120.6 °C for PE/BN40. This indicates that the BN promotes the PE crystallization by acting as a heterogeneous nucleation agent . Thus, the stretching temperature of 130 °C chosen in this work is about 10 °C higher than T c , ensuring a molten state of the sample prior to stretching.…”

Section: Results and Discussionmentioning

confidence: 99%

“…This indicates that the BN promotes the PE crystallization by acting as a heterogeneous nucleation agent. 26 Thus, the stretching temperature of 130 °C chosen in this work is about 10 °C higher than T c , ensuring a molten state of the sample prior to stretching. Figure 2b gives the DSC heating curves at 10 °C/min.…”

Section: Characterization Of Pe/bn Nanocompositesmentioning

confidence: 99%

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High-Speed Melt Stretching Enables Facile Fabrication of Mechanically Superstrong and Highly Thermo-Conductive Anisotropic Polyethylene/BN Nanocomposite Films

Sun,

Ye,

Huang

et al. 2024

ACS Appl. Polym. Mater.

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Fabrication of high-performance thermally conductive polymer nanocomposites through melt processing is crucial for large-scale industrial applications. However, this remains underdeveloped due to challenges with regulating nanofillers in viscous polymer melts. Herein, we propose a high-speed melt stretching strategy to prepare thermally conductive nanocomposite films of high-density polyethylene/boron nitride (PE/BN). By rapidly applying a maximum 80× stretch ratio to the high-temperature composite melt using a homemade two-drum extensional machine, two-dimensional BN nanosheets are highly oriented and redispersed within the PE matrix. This enables the production of nanocomposite films with superstrong mechanical properties, including high strength (>90 MPa) and modulus (>3 GPa). The horizontally aligned BN nanosheets simultaneously create fast pathways for phonon transport, resulting in a high in-plane thermal conductivity of 6.56 W/m K for the film with 40 wt % BN. This value is superior to previous reports on polymer/BN composites with similar filler fractions and ensures an excellent cooling capability of the film for commercial LED modules. Additionally, the melt-stretched PE/BN films demonstrate significantly improved thermo-mechanical and electrical insulating properties compared to their hot-pressed counterparts, attributed to the microstructural advantages. This work offers a viable melt processing approach for developing high-performance general plastic-based thermally conductive films toward electronic device applications.

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Section: Results and Discussionmentioning

confidence: 99%

Section: Characterization Of Pe/bn Nanocompositesmentioning

confidence: 99%

High-Speed Melt Stretching Enables Facile Fabrication of Mechanically Superstrong and Highly Thermo-Conductive Anisotropic Polyethylene/BN Nanocomposite Films

Sun,

Ye,

Huang

et al. 2024

ACS Appl. Polym. Mater.

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“…The preparation of PA 6 composites depends on the dispersion of fillers, and good dispersion is beneficial to the performance of the composites. A lot of research had been done on PA 6/h-BN composites mainly on flame retardant properties [1], thermal conductivity [4,5] and crystallization properties [6,7]. The key to the preparation of PA 6 composites lies in the dispersibility of the fillers.…”

Section: Intruductionmentioning

confidence: 99%

The high thermal conductivity composite of PA 6/h-BN prepared by micron mixing in the solution

Shang,

Wu,

et al. 2024

Preprint

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The polyamide 6 powder was prepared by the liquid phase method, and then mixed with hexagonal boron nitride (h-BN) in a high-pressure homogenizer for micron-level mixing, and finally the composite material is obtained by hot pressing. The thermal conductivity of composites was as high as 1.73 W/(m•K). The results showed that the dispersion of h-BN in the matrix was well and there was no obvious agglomeration in the composite from the scanning electron microscope. Differential scanning calorimetry and X-ray diffraction results showed that h-BN affects the crystalline of polyamide 6 and the thermal stability of the composites was improved. The composite is expected to be used in high thermal conductivity functional plastics.

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A facile strategy to improve the mechanical and thermal conductivity of PA6 nanocomposites by introducing graphene oxide/sodium benzoate compounding nucleator

Huang

Zhang

et al. 2021

J of Applied Polymer Sci

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In this study, a new and facile route has been developed to prepare graphene oxide (GO)/sodium benzoate (Sb) compounding nucleator (GO-Sb) reinforced polyamide 6 (PA6) nanocomposites. The effects and mechanism of adding GO/Sb compounding nucleator on the morphology and properties of PA6 nanocomposites were systematically investigated. The experimental resultsshowed that there are electrostatic interaction and π-π conjugation between GO and Sb, which make the GO-Sb compounding nucleator homogenously dispersed in matrix and gain good interfacial adhesion. XRD and DSC analysis revealed that incorporation of Sb improved the formation of γ-crystal. In addition, GO-Sb significantly enhanced the crystallization temperature of PA6 nanocomposites due to "the heterogeneous nucleating effects". The tensile results showed that the tensile strength and elastic modulus of the nanocomposites can be obviously improved by incorporation of GO-Sb compounding nucleator at low contents. The tensile strength and impact strength of the PA6-GO-Sb (100/0.05/0.25) nanocomposite were enhanced by 69.9% and 157.1%, respectively compared with pure PA6. Compared with pure PA6, the thermal conductivity of PA6-GO-Sb (100/0.05/0.25) nanocomposite increased by 258.8%. This simple and effective approach is believed to offer possibilities for broadening the graphene applications with the development of PA6-graphene nanocomposites.

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Isothermal Crystallization Properties of Polyamide 6 / Hexagonal Boron Nitride Nanocomposites

Cited by 4 publications

References 19 publications

High-Speed Melt Stretching Enables Facile Fabrication of Mechanically Superstrong and Highly Thermo-Conductive Anisotropic Polyethylene/BN Nanocomposite Films

High-Speed Melt Stretching Enables Facile Fabrication of Mechanically Superstrong and Highly Thermo-Conductive Anisotropic Polyethylene/BN Nanocomposite Films

The high thermal conductivity composite of PA 6/h-BN prepared by micron mixing in the solution

A facile strategy to improve the mechanical and thermal conductivity of PA6 nanocomposites by introducing graphene oxide/sodium benzoate compounding nucleator

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