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Thermal conductivity of graphite nanofiber electrospun from graphene-oxide-doped polyimide

YUAN Ze-zheng CHEN Wei SHI Yun-kai CHU Xiao-dong HUANG Zheng-hong GAN Lin LI Jia HE Yan-bing LI Bao-hua KANG Fei-yu DU Hong-da

袁泽正, 陈威, 时赟凯, 褚晓东, 黄正宏, 干林, 李佳, 贺艳兵, 李宝华, 康飞宇, 杜鸿达. 氧化石墨烯掺杂的电纺聚酰亚胺基石墨纳米纤维的导热性能[J]. 新型炭材料. doi: 10.1016/S1872-5805(21)60077-X
引用本文: 袁泽正, 陈威, 时赟凯, 褚晓东, 黄正宏, 干林, 李佳, 贺艳兵, 李宝华, 康飞宇, 杜鸿达. 氧化石墨烯掺杂的电纺聚酰亚胺基石墨纳米纤维的导热性能[J]. 新型炭材料. doi: 10.1016/S1872-5805(21)60077-X
YUAN Ze-zheng, CHEN Wei, SHI Yun-kai, CHU Xiao-dong, HUANG Zheng-hong, GAN Lin, LI Jia, HE Yan-bing, LI Bao-hua, KANG Fei-yu, DU Hong-da. Thermal conductivity of graphite nanofiber electrospun from graphene-oxide-doped polyimide[J]. NEW CARBON MATERIALS. doi: 10.1016/S1872-5805(21)60077-X
Citation: YUAN Ze-zheng, CHEN Wei, SHI Yun-kai, CHU Xiao-dong, HUANG Zheng-hong, GAN Lin, LI Jia, HE Yan-bing, LI Bao-hua, KANG Fei-yu, DU Hong-da. Thermal conductivity of graphite nanofiber electrospun from graphene-oxide-doped polyimide[J]. NEW CARBON MATERIALS. doi: 10.1016/S1872-5805(21)60077-X

氧化石墨烯掺杂的电纺聚酰亚胺基石墨纳米纤维的导热性能

doi: 10.1016/S1872-5805(21)60077-X
基金项目: 广东珠江人才计划本土创新研究团队项目(2017BT01N111)和广东省重点实验室项目(2020B1212060015)
详细信息
    通讯作者:

    杜鸿达,副研究员. E-mail: duhd@sz.tsinghua.edu.cn

  • 中图分类号: TB33

Thermal conductivity of graphite nanofiber electrospun from graphene-oxide-doped polyimide

Funds: This work was supported by the Local Innovative and Research Teams Project of Guangdong Pearl River Talents Program (2017BT01N111), and Guangdong Key Laboratory Project (2020B1212060015)
More Information
  • 摘要: 本文将氧化石墨烯(GO)分散在N,N-二甲基乙酰胺(DMAc)中,以均苯四甲酸二酐(PMDA)和二氨基二苯醚(ODA)为单体聚合成聚酰亚胺(PI)的前驱体溶液,通过静电纺丝得到平行取向的纳米纤维薄膜,经热亚胺化制得聚酰亚胺纤维。用偏振红外光谱仪测试C = O键在平行和垂直纤维方向的吸收强度,随着GO添加量的增加,平行纤维轴向的方向上吸收强度逐渐增强,至0.1%GO添加量达到最大值。这是由于GO通过提高静电纺丝溶液电导率,提高了PI分子链的取向程度。经炭化和石墨化,PI纤维转化为石墨纤维。石墨纤维的XRD显示(002)面间距随GO含量增加而减少,说明GO的添加提高了石墨化程度。这是因为GO诱导了石墨化过程。石墨纤维的拉曼光谱显示D峰随着GO的添加逐渐减小,表明了石墨微晶的缺陷逐渐减少。这些都是石墨纤维热导率增加的原因。通过稳态T型法测量得到的GO/PI基石墨纤维的热导率中,0.1%GO含量对应于最高的热导率,达到331 W m−1 K−1。本文发现极少量GO(0.1%)就可以显著提高PI基石墨纳米纤维的热导率,该方法具备巨大的应用潜力。
  • Figure  1.  Preparation process of GO/PI-based graphite nanofiber.

    Figure  2.  Calculating method of orientation factor($ f $).

    Figure  3.  Calculating method of $ {{{I}}_{\rm{D}}}/{{{I}}_{\rm{G}}}$.

    Figure  4.  Mechanism of measuring thermal conductivity using the steady-state T-type method.

    Figure  5.  SEM images of (a) PI graphite nanofibers, (b) 0.05% GO/PI graphite nanofibers, (c) 0.1% GO/PI graphite nanofibers and (d-f) Magnified images of (a–c). TEM images of (g) PI graphite nanofibers, (h) 0.05% GO/PI graphite nanofibers, (i) 0.1% GO/PI graphite nanofibers. Diameters distribution maps of (j) PI graphite nanofibers, (k) 0.05% GO/PI graphite nanofibers and (l) 0.1% GO/PI graphite nanofibers.

    Figure  6.  (a) Polarized FT-IR spectra of the GO/PI composite nanofibers, (b) Orientation factor of GO/PI with different GO contents and (c) Conductivity of GO/PAA solution with different GO mass contents.

    Figure  7.  (a) XRD spectra of the GO/PI graphite nanofiber, (b) Degree of graphitization and average size of crystallite with different GO contents, (c) Raman spectra of the graphite nanofiber and (d) ID/IG with different GO contents.

    Figure  8.  (a) Thermal conductivity under different temperature, (b) average thermal conductivity and (c) electrical resistivity of GO/PI graphite nanofibers with different GO mass contents.

    Table  1.   Parameters of the electrospinning.

    ParametersValues
    Conc. PAA (wt%)15
    Voltage(kV) and distance(cm)20/20
    Nozzle diameter(mm)0.4
    Injection speed(mm/min)0.02
    Directional collector speed(r/min)2800
    下载: 导出CSV

    Table  2.   The graphitization degree and average size of the crystallite of GO/PI graphite nanofibers with different GO mass contents.

    GO content2θ(°)FWHMd002(nm)
    026.330.6960.3383
    0.01%26.410.6730.3372
    0.03%26.450.5680.3368
    0.05%26.520.3790.3360
    0.1%26.540.2760.3357
    下载: 导出CSV
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  • 收稿日期:  2021-02-24
  • 修回日期:  2021-04-29
  • 网络出版日期:  2021-07-05

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