Preparation and thermal conductivity of barium titanate-boron nitride/poly(m-phenyleneisophthalamide) dielectric composites
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摘要: 选用聚多巴胺(PDA)和十八烷基异氰酸酯分别改性钛酸钡纳米线(BTW)和氮化硼纳米片(BNNSs)来构筑D@BTW-fBNNSs高介电导热填料。研究了D@BTW-fBNNSs高介电导热填料对芳香族聚酰胺(PMIA)基复合电介质介电性能、击穿强度和导热性能的影响。结果表明:随着复合电介质中D@BTW-fBNNSs含量的增加,PMIA基复合电介质的介电常数提升明显;当D@BTW-fBNNSs含量为15wt%时,PMIA基复合电介质在103 Hz时的介电常数相较于PMIA基体提高了75%,同时在高温环境中(>150℃)PMIA基复合电介质的介电性能保持稳定,能够满足高温环境的使用要求。此外,D@BTW-fBNNSs还明显改善了PMIA基复合电介质的导热性能;含有15wt%D@BTW-fBNNSs的PMIA基复合电介质,其导热系数相较于PMIA基体提升了1.5倍。本研究将为设计具有高介电常数、低热效应的耐高温聚合物基电介质提供新的方法和思路。Abstract: Polydopamine (PDA) and octadecyl isocyanate were selected to functionalize barium titanate nanowires (BTW) and boron nitride nanosheets (BNNSs) respectively, and construct D@BTW-fBNNSs particles. The influences of D@BTW-fBNNSs on dielectric property, breakdown strength and thermal conductivity of poly (m-phenyleneisophthalamide) (PMIA) dielectric were investigated. The results show that, with increasing content of D@BTW-fBNNSs, the dielectric constant of PMIA dielectric significantly increases. The dielectric constant of PMIA composite with 15wt%D@BTW-fBNNSs displays 75% improvement at 103 Hz compared with PMIA matrix, and the dielectric loss of corresponding PMIA composite maintains at relatively low value. Furthermore, the dielectric properties of D@BTW-fBNNSs/PMIA dielectric are stable under high temperature (>150℃), which can meet the requirement in high temperature environment. Additionally, the thermal conductivity of PMIA dielectric is obviously improved with increased content of D@BTW-fBNNSs. The thermal conductivity of PMIA dielectric with 15wt% D@BTW-fBNNSs is 1.5 times higher than that of PMIA matrix. This research will provide new method and idea for the design of high-temperature polymer dielectric with enhanced dielectric constant and low thermal effect.
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图 2 BTW的SEM图(a)和高分辨率TEM图(b);(c) D@BTW的高分辨率TEM图;BNNSs的高分辨率TEM图(右上角为BNNSs的电子衍射图,左下角为BNNSs溶液(1 mg/mL)的丁达尔效应) (d)和AFM图(e);(f) D@BTW-fBNNSs的TEM图
Figure 2. SEM image (a) and high-resolution TEM image (b) of BTW; (c) High-resolution TEM image of D@BTW; High-resolution TEM image of BNNSs (insert in upper right corner is electron diffraction pattern of BNNSs, insert in lower left corner is Tyndall effect of BNNSs solution (1 mg/mL)) (d) and AFM image of BNNSs (e); (f) TEM image of D@BTW-fBNNSs
图 5 D@BTW-fBNNSs/PMIA复合电介质的SEM图: (a) PMIA;(b) 5wt%D@BTW-fBNNSs/PMIA;(c) 7wt%D@BTW-fBNNSs/PMIA;(d) 10wt%D@BTW-fBNNSs/PMIA;(e) 15wt%D@BTW-fBNNSs/PMIA;(f) 图(e)中矩形区域
Figure 5. SEM images of D@BTW-fBNNSs/PMIA composites: (a) PMIA; (b) 5wt%D@BTW-fBNNSs/PMIA; (c) 7wt%D@BTW-fBNNSs/PMIA; (d) 10wt%D@BTW-fBNNSs/PMIA; (e) 15wt%D@BTW-fBNNSs/PMIA; (f) Magnified area of rectangle in figure (e)
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