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首页> 外文期刊>Composites Science and Technology >Improved breakdown strength of Poly(vinylidene Fluoride)-based composites by using all ball-milled hexagonal boron nitride sheets without centrifugation
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Improved breakdown strength of Poly(vinylidene Fluoride)-based composites by using all ball-milled hexagonal boron nitride sheets without centrifugation

机译：通过使用所有球磨六方氮化硼片而无需离心处理，提高了聚偏二氟乙烯基复合材料的击穿强度

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摘要

Hexagonal boron nitride (h-BN) is an ideal candidate to endow ferroelectric polymers with high energy density (Ue) due to its intrinsic high breakdown strength (E-b) of 800 kV/mm. Generally, it is believed that only boron nitride nanosheets (BNNSs) could remarkably improve E-b of composite. Nevertheless, low-yield and timeconsuming preparation procedures of BNNSs greatly limits the application of h-BN. To overcome this challenge, in this study, all ball-milled h-BN (B-BN) sheets were entirely used to enhance E-b of poly (vinylidene fluoride) (PVDF) without any further centrifugation. E-b of composites increased as ball-milling time increases at filler content of 8 wt%. Remarkably, PVDF with h-BN ball-milled for 16 h (B-16-BN) possesses an impressive Eb value of 506.8 kV/mm, which is 2.86 times that of neat PVDF (272.4 kV/mm) and even 1.33 times higher than that of PVDF/h-BN composites (380.6 kV/mm). E-b of PVDF/B-16-BN composites is close to that of PVDF/OHBNNSs composites at same filler content, suggesting that the centrifugation is not a necessary procedure. Besides, improved dielectric loss, calculated U-e, mechanical properties and in-plane thermal conductivity can also be achieved for PVDF/B-16-BN composites. These improved properties of PVDF/B16-BN composites indicate that the employment of B56-BN can avoid the weakness of low-yield and time-consuming preparation procedure of BNNSs and broaden its applications in the field of energy storage. Finally, the improved dispersion of OH-BN as well as synergy effect (f) on E-b between OH-BN and OH-BNNSs were discussed to better understand these improved properties of PVDF/B-16-BN composites.
机译：六方氮化硼（h-BN）由于其固有的800 kV / mm的高击穿强度（E-b），是赋予铁电聚合物高能量密度（Ue）的理想选择。通常认为只有氮化硼纳米片（BNNSs）才能显着改善复合材料的E-b。然而，BNNSs的低产且耗时的制备程序极大地限制了h-BN的应用。为了克服这一挑战，在这项研究中，所有球磨h-BN（B-BN）片材都被完全用于增强聚偏二氟乙烯（PVDF）的E-b，而无需进一步离心。当填料含量为8 wt％时，随着球磨时间的增加，复合材料的E-b增加。值得注意的是，h-BN球磨16 h（B-16-BN）的PVDF的Eb值令人印象深刻，为506.8 kV / mm，是纯PVDF（272.4 kV / mm）的2.86倍，甚至高1.33倍比PVDF / h-BN复合材料（380.6 kV / mm）高。在相同填料含量下，PVDF / B-16-BN复合材料的E-b与PVDF / OHBNNSs复合材料的E-b接近，这表明离心不是必要的程序。此外，PVDF / B-16-BN复合材料的介电损耗，计算的U-e，机械性能和面内导热率也可以得到改善。 PVDF / B16-BN复合材料的这些改善的性能表明，B56-BN的使用可以避免BNNS的低产率和费时的制备程序的缺点，并扩大其在储能领域的应用。最后，讨论了改进的OH-BN分散性以及OH-BN和OH-BNNS之间的E-b协同效应（f），以更好地理解PVDF / B-16-BN复合材料的这些改进的性能。

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