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摘要
以氮化硼(BN)和氮化铝(AlN)为导热填料,采用溶液超声剥离法将BN和AlN分散在聚酰胺6(PA6)中,再与聚偏氟乙烯(PVDF)熔融共混,制备了具有双逾渗结构的PVDF/(PA6/BN/AlN)导热复合材料,研究了导电填料BN/AlN在两相中的选择性分布以及BN/AlN填充量对复合材料导热性能和介电性能的影响。结果表明,BN/AlN选择性地分布在PA6中,随着BN/AlN填充量的增加,复合材料热导率升高,有利于提高复合材料的吸热和散热能力。BN/AlN填充量为5%(wt,质量分数,下同)时,复合材料的热导率为0.564W/(m·K),与纯PVDF/PA6复合材料相比,热导率提高了164.8%。BN/AlN的加入有利于提高PVDF/PA6复合材料的介电性能,在BN/AlN填充量为5%、频率为100Hz条件下,PVDF/(PA6/BN/AlN)复合材料介电常数达到11923,是纯PVDF/PA6介电常数的917倍。
Abstract
Using boron nitride (BN) and aluminum nitride (AlN) as thermally conductive fillers,BN and AlN are dispersed in polyamide 6(PA6) by solution ultrasonic stripping,and then melt blended with polyvinylidene fluoride (PVDF),PVDF/(PA6/BN/AlN) thermal conductive composites with double percolation structure was prepared.The effect of BN/AlN loading on the thermal conductivity and dielectric properties of PVDF/PA6 composite were investigated.The results showed that BN/AlN selectively distributed in the PA6 phase.With the increase of BN/AlN loading,the thermal conductivity of the composite increases,which are beneficial to improve the heat absorption and heat dissipation ability of the composite.When the BN/AlN loading is 5wt%,the thermal conductivity of the composite is 0.564W/(m·K),and the thermal conductivity is increased by 164.8% compared with the pure PVDF/PA6 composite.The addition of BN/AlN is also beneficial to improve the dielectric properties of PVDF/PA6 composite.When BN/AlN is 5wt% and the frequency is 100Hz,the dielectric constant value is 11923,which was 917 times that of pure PA6/PVDF composite.
关键词
聚偏氟乙烯/聚酰胺6
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氮化硼/氮化铝
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选择性分布
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热导率
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介电性能
Key words
PVDF/PA6
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BN/AlN
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selective distribution
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thermal conductivity
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dielectric property
双逾渗结构PVDF/(PA6/BN/AlN)导热复合材料的制备及性能研究[J].
化工新型材料, 2020, 48(7): 60-63 DOI:10.19817/j.cnki.issn 1006-3536.2020.07.014
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基金资助
国家自然科学基金(51403001)
