Activation of boron nitride nanotubes and their polymer composites for improving mechanical performance

Zhou, Sheng‐Jun; Ma, Chun-Yin; Meng, Ye-Yong; Su, Hai‐Feng; Zhu, Zheng; Liu, Qing Lin; Xie, Su‐Yuan

doi:10.1088/0957-4484/23/5/055708

Cited by 44 publications

(21 citation statements)

References 38 publications

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“…In the spectra of PAN nanofibers, the characteristic absorption bands at 2920, 2238, 1662, and 1449 cm −1 are, respectively, assigned to νCH stretching, νCN stretching, δCH bond bending, and δCH 2 asymmetric vibration . In contrast, in the spectra of PAN/IPDI fibers, two obvious peaks at ∼2245 and ∼2920 cm −1 exist due to the isocyanate νNCO and νCH stretching vibrations in IPDI, respectively . Besides, bands at 1627 and 1563 cm −1 due to CO vibration in the NCO group are in good agreement with the existence of IPDI in the PAN/IPDI core–shell nanofibers.…”

Section: Resultssupporting

confidence: 59%

Needleless emulsion electrospinning for scalable fabrication of core–shell nanofibers

Zhou

Ding

et al. 2014

J of Applied Polymer Sci

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This article reports a new needleless emulsion electrospinning method for scale‐up fabrication of ultrathin core–shell polyacrylonitrile (PAN)/isophorone diisocyanate (IPDI) fibers. These core–shell fibers can be incorporated at the interfaces of polymer composites for interfacial toughening and self‐repairing due to polymerization of IPDI triggered by environmental moisture. The electrospinnable PAN/IPDI emulsion was prepared by blending PAN/N,N‐dimethylformamide and IPDI/N,N‐dimethylformamide solutions (with the solute mass fraction of 1 : 1). The electrospinning setup consisted of a pair of aligned metal wires as spinneret (positive electrode) to infuse the PAN/IPDI emulsion and a rotary metal disk as fiber collector (negative electrode). The formed ultrathin core–shell PAN/IPDI fibers were collected with the diameter in the range from 300 nm to 3 μm depending on the solution concentration and process parameters. Optical microscopy, scanning electron microscopy, and Fourier transform infrared spectroscopy were used to characterize the core–shell nanostructures. Dependencies of the fiber diameter on the PAN/IPDI concentration, wire spacing, and wire diameter were examined. Results show that needleless emulsion electrospinning provides a feasible low‐cost manufacturing technique for scalable, continuous fabrication of core–shell nanofibers for potential applications in self‐repairing composites, drug delivery, etc. © 2014 Wiley Periodicals, Inc. J. Appl. Polym. Sci. 2014, 131, 40896.

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Section: Resultssupporting

confidence: 59%

Needleless emulsion electrospinning for scalable fabrication of core–shell nanofibers

Zhou

Ding

et al. 2014

J of Applied Polymer Sci

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“…We have also investigated interfacial stress transfer from the PVA matrix to the BNNTs from the stress-induced Raman band shifts of the BNNTs in the matrix and correlated this behavior with the mechanical properties of the nanocomposites. Finally, since it is well established that surface functionalization is necessary for achieving good mechanical and thermal properties for BNNTs-based nanocomposites, ,,− we also investigated the effect of functionalization of BNNTs with −OH groups, upon both their dispersion and stress transfer in the nanocomposites. Previously, both BNNTs and hexagonal boron nitride nanosheets − have been shown to be ideal reinforcements for thermally conductive and electrical insulating polymer composites.…”

Section: Introductionmentioning

confidence: 99%

Reinforcement of Polymer-Based Nanocomposites by Thermally Conductive and Electrically Insulating Boron Nitride Nanotubes

Wang

Prestat

et al. 2019

ACS Appl. Nano Mater.

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A detailed study has been undertaken of the mechanisms of stress transfer in a nanocomposite consisting of hexagonal boron nitride (hBN) nanotubes (BNNTs) in a poly(vinyl alcohol) (PVA) matrix based upon the use of non-resonance Raman spectroscopy. The structure of the BNNTs was characterized by using transmission electron microscopy (TEM) where it was shown that the majority of the nanotubes had 2–5 walls with some having over 10 walls. The structure and mechanical properties of nanocomposites containing up to 1 wt % of both pristine and hydroxyl-functionalized nanotubes (OH-BNNTs) in PVA were investigated. The dispersion of the BNNTs in the nanocomposites was characterized by using a combination of transmission electron microscopy and Raman mapping. The mechanical properties of the nanocomposites were evaluated by tensile testing, and it was found that the Young’s modulus, yield strength, and fracture stress all increased on the addition of the BNNTs. A further improvement in the mechanical properties was obtained for nanocomposites containing the OH-BNNTs. The variation of the Young’s modulus of the nanocomposites with volume fraction of the BNNTs was evaluated by using the rule of mixtures, and it was shown that the effective Young’s modulus (E eff) of the BNNTs approached 825 ± 100 GPa at low volume fractions. The value of E eff was found to decrease with increasing BNNT volume fraction as the result of nanotube bundling. By use of nondestructive Raman spectroscopy, stress transfer from the PVA matrix to the BNNTs was evaluated from stress-induced shifts of the hBN Raman G band, enabling the analysis of interfacial adhesion in the nanocomposites. Larger band shifts were obtained for the OH-BNNTs indicating a stronger interface between the BNNTs and the PVA matrix and a better dispersion. A value of 1.34 ± 0.72 was determined from the stress-induced Raman band shifts for the Grüneisen parameter of the BNNTs. In consideration of their efficient reinforcement of a polymer at very low additions and unique electrically insulating and thermally conductive properties, BNNTs are shown to have great potential to be used as nanofillers for composites in a number of applications.

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“…A third approach takes advantage of the amino groups present at the surface of the BNNTs produced under specific conditions. 30,33 It should be highlighted that significantly more effort has been devoted to the direct functionalization of hexagonal boron nitride nanosheets (BNNSs). 34−36 In this regard, Sainsbury et al 36 presented a covalent functionalization approach of BNNSs by using the reactivity of the nitrene radicals produced by the thermolysis of (4-methoxybenzyl)oxycarbonyl azide, where the labile nitrene is able to react with the electron-deficient boron atom.…”

Section: ■ Introductionmentioning

confidence: 99%

Enhanced Thermal Conductivity in Polymer Nanocomposites via Covalent Functionalization of Boron Nitride Nanotubes with Short Polyethylene Chains for Heat-Transfer Applications

Quiles-Díaz

Martinez‐Rubi

Guan

et al. 2018

ACS Appl. Nano Mater.

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Boron nitride, which possesses high thermal conductivity, is often incorporated into polymer matrixes for thermal management. The enhancement in the thermal conductivity depends on the filler shape, size, effective dispersion in the matrix, and interfacial thermal resistance between the filler and matrix, and the last two are the most challenging issues. To address these challenges, in this study two different covalent functionalization approaches on boron nitride nanotubes (BNNTs) with short polyethylene (PE) chains are employed: one based on the Williamson reaction and the other on nitrene [1 + 2] chemistry. The covalent connection between the nanotubes and the polymer is confirmed by Fourier transform infrared, X-ray photoelectron microscopy, tandem thermogravimetric−infrared spectroscopy analysis and energy-filtered transmission electron microscopy. The modification of BNNTs with short polymer chains has resulted in an excellent strategy to modulate the interface in polymer composites. Tuning the interface has a strong influence on thermal transport, and up to an ∼250% increase in the thermal conductivity of BNNT-HDPE nanocomposites has been observed when the loading increases from 20 to 40 wt % of PE-modified BNNTs due to the improved dispersion and reduced interfacial thermal resistance. The materials described here show the potential for heattransfer applications.

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Activation of boron nitride nanotubes and their polymer composites for improving mechanical performance

Cited by 44 publications

References 38 publications

Needleless emulsion electrospinning for scalable fabrication of core–shell nanofibers

Needleless emulsion electrospinning for scalable fabrication of core–shell nanofibers

Reinforcement of Polymer-Based Nanocomposites by Thermally Conductive and Electrically Insulating Boron Nitride Nanotubes

Enhanced Thermal Conductivity in Polymer Nanocomposites via Covalent Functionalization of Boron Nitride Nanotubes with Short Polyethylene Chains for Heat-Transfer Applications

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