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模压氮化硼/聚对苯二甲酸乙二醇酯复合材料的导热机制与散热效果

王世民 温变英

王世民, 温变英. 模压氮化硼/聚对苯二甲酸乙二醇酯复合材料的导热机制与散热效果[J]. 复合材料学报, 2021, 39(0): 1-11
引用本文: 王世民, 温变英. 模压氮化硼/聚对苯二甲酸乙二醇酯复合材料的导热机制与散热效果[J]. 复合材料学报, 2021, 39(0): 1-11
Shimin WANG, Bianying WEN. Thermal conduction mechanism and heat dissipation effect of compression molded boron nitride/polyethylene terephthalate composites[J]. Acta Materiae Compositae Sinica.
Citation: Shimin WANG, Bianying WEN. Thermal conduction mechanism and heat dissipation effect of compression molded boron nitride/polyethylene terephthalate composites[J]. Acta Materiae Compositae Sinica.

模压氮化硼/聚对苯二甲酸乙二醇酯复合材料的导热机制与散热效果

基金项目: 北京市自然科学基金暨北京市教委科技计划重点项目(编号:KZ202110011018)
详细信息
    通讯作者:

    温变英,博士,教授,硕士生导师,研究方向为功能复合材料、聚合物基绿色复合材料 E-mail: wenbianying@tsinghua.org.cn

  • 中图分类号: TB332

Thermal conduction mechanism and heat dissipation effect of compression molded boron nitride/polyethylene terephthalate composites

  • 摘要: 电子电器设备中元器件的高密度集成使得散热问题日益突出,对导热材料的需求不断增长。本文以聚对苯二甲酸乙二醇酯(PET)为基体,六方氮化硼(h-BN)作为导热填料,通过熔融共混法制备h-BN/PET复合材料,考察了h-BN含量和PET基体聚集态结构对复合材料导热性能的影响,分析了复合材料的导热机制,并从材料应用的角度探讨了复合材料导热系数的温度依赖性和散热效果。结果表明,PET基体的结晶度和h-BN含量对复合材料的最终导热系数均有贡献,复合材料的导热系数随结晶度和h-BN含量的增加而提升。h-BN发挥了异相成核作用,显著加快了PET的结晶速度,提高了PET的结晶度。模压成型中h-BN受剪切应力驱使在PET基体中沿流动方向取向,导致复合材料呈现明显的各向异性特征。面内方向h-BN的有序排列为声子提供了更为通畅的传导通道。当h-BN含量为50wt%时,复合材料的面内与面间导热系数分别达到最大值3.00 W·m−1·K−1和2.19 W·m−1·K−1。h-BN/PET复合材料具有良好的散热效果,h-BN含量越高,复合材料的冷却速率越快,散热过程中温度下降符合指数函数规律。

     

  • 图  1  六方氮化硼/聚对苯二甲酸乙二醇酯(h-BN/PET)复合材料的DSC升温(a)和降温(b)曲线

    Figure  1.  DSC heating (a) and cooling (b) curves of boron nitride/polyethylene terephthalate (h-BN/PET) composites

    图  2  h-BN/PET在220℃下的等温结晶曲线:(a) 不同h-BN含量材料的结晶变化曲线,(b) Avrami 方程曲线

    Figure  2.  Isothermal crystallization of h-BN/PET curves at 220℃:(a) evolution curves of PET crystallization with different h-BN content, (b) Avrami equation curves

    Xt—Relative crystallinity at time t

    图  3  20wt%h-BN含量的h-BN/PET复合材料于220℃下不同等温时间下的导热系数

    Figure  3.  Thermal conductivity of h-BN/PET composites with 20wt% h-BN at 220℃ with different isothermal crystallization time

    图  4  h-BN/PET复合材料于220℃下等温结晶15 min前后的导热系数

    Figure  4.  Thermal conductivity of h-BN/PET composites before and after isothermal crystallization at 220°C for 15 min

    图  5  (a) 不同h-BN含量下h-BN/PET复合材料的面内与面间导热系数对比及(b)h-BN/PET复合材料导热系数的各向异性指数值

    Figure  5.  (a) Comparison of in-plane and through-plane thermal conductivity of h-BN/PET composites with different h-BN content and (b) anisotropy of the thermal conductivity of the h-BN/PET composites.

    图  6  不同h-BN含量的h-BN/PET复合材料横截面SEM图像:(a) 0wt%, (b) 10wt%, (c) 20wt%, (d) 30wt%, (e) 40wt%, (f) 50wt%

    Figure  6.  SEM images of cross section of h-BN/PET composites with different h-BN content: (a) 0 wt%, (b) 10 wt%, (c) 20 wt%, (d) 30 wt%, (e)40 wt%, (f)50 wt%

    图  7  不同h-BN含量h-BN/PET复合材料的动态流变曲线:(a)储能模量;(b)损耗模量;(c)复数黏度

    Figure  7.  Dynamic rheological curves of h-BN/PET composites with different h-BN content: (a) storage modulus; (b) loss modulus; (c) complex shear viscosity

    图  8  不同h-BN含量h-BN/PET复合材料的导热性能-温度关系曲线:(a)比热-温度;(b)热扩散系数-温度;(c)导热系数-温度

    Figure  8.  The thermal conductivity-temperature relationship curves of h-BN/PET composites with different h-BN content: (a) specific heat-temperature; (b) thermal diffusivity-temperature; (c) thermal conductivity-temperature

    图  9  h-BN/PET复合材料的(a)表面温度变化与冷却时间曲线,(b) h-BN含量为0wt%、20wt%和50wt%的红外热成像图

    Figure  9.  (a) The curves of surface temperature variation versus cooling time and (b) infrared thermal images of h-BN/PET composites with h-BN content of 0wt%, 20wt% and 50wt%.

    表  1  h-BN/PET复合材料的结晶参数

    Table  1.   The crystallization parameters of h-BN/PET composites

    Content of h-BN/wt%$ {T}_{\mathrm{m}} $/℃$ {T}_{\mathrm{c}} $/℃$ {X}_{\mathrm{c}} $/%
    0256.2207.928.6
    10256.5224.236.8
    20257.4228.437.4
    30256.3229.636.3
    40257.8233.636.0
    50257.7235.536.1
    Notes: $ {T}_{\mathrm{m}} $—Melting peak temperature; $ {T}_{\mathrm{c}} $—Crystallization peak temperature; $ {X}_{\mathrm{c}} $—Crystallinity
    下载: 导出CSV

    表  2  不同h-BN含量的h-BN/PET复合材料在220℃下的等温结晶动力学参数

    Table  2.   Isothermal crystallization kinetic parameters of h-BN/PET composites with different h-BN content at 220℃

    Content of h-BN/wt%$ K $/minn$ {t}_{1/2} $/min$ n $
    00.00458.732.32
    100.02276.061.90
    200.03215.681.77
    300.03495.211.81
    400.05024.631.71
    500.06114.391.64
    Notes: $ K $—Crystallization rate constants; $ {t}_{1/2} $—Crystallization half-time; $ n $—Avrami index
    下载: 导出CSV

    表  3  20wt%h-BN含量的h-BN/PET复合材料于220℃下不同等温时间的结晶度

    Table  3.   The crystallinity of h-BN/PET composites with 20wt% h-BN at 220℃ with different isothermal crystallization time

    Isothermal time/min05102030
    Crystallinity/%37.438.239.841.144.5
    下载: 导出CSV

    表  4  h-BN/PET复合材料散热效果的指数拟合参数

    Table  4.   The index fitting parameters of the heat dissipation effect of h-BN/PET composites

    ContentParameter
    $ A $$ b $$ C $$ \mathrm{C}\mathrm{O}\mathrm{D} $
    0179.7575.3324.0599.87%
    10172.2358.9127.7899.90%
    20171.3253.1527.8499.96%
    30169.9349.7528.3199.93%
    40169.7344.7528.6199.86%
    50166.4129.9731.6999.83%
    Notes: A, b and C—Correction factor; $ \mathrm{C}\mathrm{O}\mathrm{D} $—Curve fitting degree; Content—Content of h-BN
    下载: 导出CSV
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  • 收稿日期:  2021-11-11
  • 录用日期:  2021-12-04
  • 修回日期:  2021-12-01
  • 网络出版日期:  2021-12-23

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