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首页> 外文期刊>Journal of materials science >Piezoelectric formation mechanisms and phase transformation of poly(vinylidene fluoride)/graphite nanosheets nanocomposites
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Piezoelectric formation mechanisms and phase transformation of poly(vinylidene fluoride)/graphite nanosheets nanocomposites

机译：聚偏二氟乙烯/石墨纳米片纳米复合材料的压电形成机理和相变

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摘要

The β-phase of poly(vinylidene fluoride) (PVDF) is of great technical importance because of its high dielectric constant and piezoelectric effect. In this work, we exfoliated and dispersed natural graphite to prepare 2D-graphite nanosheets (GNS) and prepared PVDF/GNS nanocomposites with different GNS volumes from 1 to 7 ml as film via solution casting method. The concentration of the supernatant was about 0.3 mg/mL. The effect of GNS on the β-phase formation and mechanisms of piezoelectric formation in the PVDF/GNS nanocomposites were investigated. The results showed that with the varying amounts of GNS, the crystalline structure, the morphology, and the dielectric and piezoelectric properties of PVDF/ GNS nanocomposites changed. GNS acts as an effective nucleation agent with the orientation almost parallel to the surface of the film meanwhile increasing the amount of beta phase in the PVDF matrix with increasing amount of GNS, also the relative dielectric constant and dielectric loss of the nanocomposites increased with increasing amount of GNS. The value d_(33) also increased with increasing amount of GNS, and reached a maximum (6.7 pC/N) with 6 ml GNS. The mechanism of piezoelectric formation was proposed based on experiment results of PVDF/GNS nanocomposites.
机译：聚偏二氟乙烯（PVDF）的β相具有高介电常数和压电效应，因此具有重要的技术重要性。在这项工作中，我们剥落并分散了天然石墨，以制备2D石墨纳米片（GNS），并通过溶液流延法制备了具有1至7 ml不同GNS体积的PVDF / GNS纳米复合材料薄膜。上清液的浓度为约0.3mg / mL。研究了GNS对PVDF / GNS纳米复合材料中β相形成和压电形成机理的影响。结果表明，随着GNS含量的变化，PVDF / GNS纳米复合材料的晶体结构，形貌以及介电和压电性能发生变化。 GNS是一种有效的成核剂，其取向几乎平行于薄膜表面，同时随着GNS量的增加，PVDF基质中的β相含量也增加，纳米复合材料的相对介电常数和介电损耗也随着数量的增加而增加GNS。值d_（33）也随着GNS量的增加而增加，并在6 ml GNS时达到最大值（6.7 pC / N）。基于PVDF / GNS纳米复合材料的实验结果，提出了压电形成的机理。

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  • 来源
    《Journal of materials science》 |2013年第3期|927-932|共6页
  • 作者

    Yangyang Zhang; Shenglin Jiang; Maoyan Fan; Yike Zeng; Yan Yu; Jungang He;

  • 作者单位

    Department of Electronic Science and Technology, Huazhong University of Science and Technology, Wuhan 430074, People's Republic of China;

    Department of Electronic Science and Technology, Huazhong University of Science and Technology, Wuhan 430074, People's Republic of China;

    Yuxi Normal University, Yuxi 653100, Yunnan Province, People's Republic of China;

    Department of Electronic Science and Technology, Huazhong University of Science and Technology, Wuhan 430074, People's Republic of China;

    Department of Electronic Science and Technology, Huazhong University of Science and Technology, Wuhan 430074, People's Republic of China;

    Department of Electronic Science and Technology, Huazhong University of Science and Technology, Wuhan 430074, People's Republic of China;

  • 收录信息 美国《科学引文索引》(SCI);美国《工程索引》(EI);美国《生物学医学文摘》(MEDLINE);
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