Enhanced thermal conductivity of PE/BN composites through controlling crystallization behavior of PE matrix

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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“…Moreover, the use of higher filler loadings (up to 50 wt %) caused different effects on the thermal conductivity. [68][69][70][71]75…”

Section: Acs Applied Nano Materialsmentioning

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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“…When the content of BN in the composite shifted from 5phr to 20phr, the crystallization temperature of PE was shifted from 117.1 C to 118 C and that of PA6 was shifted from 191.3 C to 193.1 C. Apparently, BN, which liked a lot of fillers, was a nucleating agent of the PE and PA6 crystallization, which was consistent with the literature reports. 33 As shown in Figure 4(b), for PE/PC and PE/PA6 blend without BN fillers, however, the crystallization temperature of PE was 114.4 C respectively, and the crystallization temperature of PA6 was 187.9 C, which meant that the structure of dispersed phase had little effect on the crystallization temperature of the matrix.…”

Section: Morphologymentioning

confidence: 94%

Phase morphology evolution and thermally conductive networks of immiscible polymer blends

Zhang

Xie

Zhang

et al. 2020

J of Applied Polymer Sci

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The selective distribution of fillers in multi-phase polymer blends was dramatically studied to deal with thermal management fields issues. Concerning thermodynamic and kinetic effects of fillers on immiscible polymer blends, the compatibilization of fillers on phase morphology evolution and final construction of thermal conductive pathways were rarely discussed. In this work, BN fillers and polar dispersed phase were introduced into PE through various processing methods. The result showed that filler-coated shell was formed around the larger-sized dispersed phase, thereby forming more thermal conductivity network with other fillers in the two-step processing composites. When the BN content was 20 phr, the thermal conductivity was 0.8271 W/(mÁK) for PE/PA6/BN-two steps composites, which was 95.48% higher than that of PE/PA6 composites. From the perspective of the regulation of the morphological structure of the dispersed phase, this study can provide methods and basic data for improving the thermal conductivity of incompatible polymer blends.

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“…But the effect of crystallization and molecular orientation of polymer matrix on the TC of polymer-based composite cannot be deduced directly from the results of pure polymers. However, few reports on the effect of polymer 33,34 crystallization on the TC of polymer composites are available. Zhang 34 et al reported that the TC of polyethylene/BN composites was improved by controlling the crystallization of the polyethylene (PE) matrix.…”

Section: -28mentioning

confidence: 99%

“…However, few reports on the effect of polymer 33,34 crystallization on the TC of polymer composites are available. Zhang 34 et al reported that the TC of polyethylene/BN composites was improved by controlling the crystallization of the polyethylene (PE) matrix. The results show that the TC of the composites is increased with increasing crystallinity of the PE matrix, and the stable crystals of PE were more favorable for enhancing the TC of the PE/BN composites.…”

Section: -28mentioning

confidence: 99%

Effect of PLA Crystallization on the Thermal Conductivity and Breakdown Strength of PLA/BN Composites

Bai¹,

Zheng²,

Bao³

et al. 2018

ES Mater.Manuf.

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Polylactide (PLA), whose crystallinity could be easily tuned, was selected to examine the effect of polymer crystallization on thermal conductivity (TC) of the polymer composites. Compression-molded PLA/boron nitride (BN) were heat-treated at 120 °C to fabricate highly crystalline samples. It demonstrated crystallization of the PLA significantly affects TC of the PLA/BN composites. With increased BN content, the improvement of the TC of PLA/BN composites via crystallization is more obvious. TCs of the crystalline PLA/BN composites with 5 wt% and 40 wt% BN are increased by 23 % and 47 % in the in-plane direction and are increased by 21 % and 54 % in the through-plane direction compared to those of amorphous PLA/BN, while TC of pure PLA is increased by 17 % via crystallization. When BN content is 40 wt%, the in-plane and through-plane TCs of the crystalline PLA/BN are 4.7 W/mK and 0.8 W/mK, respectively. Both the amorphous and crystallized PLA/BN exhibit high breakdown strengths.

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Enhanced thermal conductivity of PE/BN composites through controlling crystallization behavior of PE matrix

Cited by 10 publications

References 31 publications

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

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

Phase morphology evolution and thermally conductive networks of immiscible polymer blends

Effect of PLA Crystallization on the Thermal Conductivity and Breakdown Strength of PLA/BN Composites

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