Enhanced Thermal Conductivity in Polyimide/Silver Particle Composite Films Based on Spontaneous Formation of Thermal Conductive Paths
Enhanced Thermal Conductivity in Polyimide/Silver Particle Composite Films Based on Spontaneous Formation of Thermal Conductive Paths
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DOI：
10.2494/photopolymer.27.187
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发表时间：
2014-07
影响因子：
0.8
通讯作者：
Tomoya Murakami;K. Ebisawa;K. Miyao;S. Ando
中科院分区：
文献类型：
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作者：
Tomoya Murakami;K. Ebisawa;K. Miyao;S. Ando
以含硫（SD）、含氟（TF）、含硅（SIM）聚酰亚胺（PI）为基体，以及SD和TF PI的共混物（b-SF）为基体，制备了一系列含有微米级金属银粒子（Ag-MP）的PI/银复合膜。复合膜的热导率（λ）在低于30vol%时与Bruggeman模型的计算值（λcal）吻合较好，而SD/Ag和b-SF/Ag复合膜在大于30vol%时的λ值明显大于λcal。Ag-MPs均匀分散的SD/Ag薄膜的λ s值与Ag-MPs选择性分散在SD相中的b-SF/Ag薄膜的λ s值几乎相等。而具有均匀分散雅阁的SIM/Ag薄膜的λ s与λcal吻合较好，远小于SD/Ag和b-SF/Ag薄膜的λ s。这些事实表明，有效的热传导路径自发地产生在SD/Ag膜和b-SF/Ag膜。
A series of polyimide (PI)/silver composite films incorporating μm-sized metallic silver particles (Ag-MPs) were prepared using matrices of sulfur(SD), fluorine(TF), and siliconcontaining (SIM) PIs as well as an immiscible blend of SDand TF-PIs (b-SF). The thermal conductivity (λ ) of the composited films accords well with the calculated value (λcal) based on the Bruggeman model below the particle contents ( ) of 30 vol%, whereas the composite films of SD/Ag and b-SF/Ag exhibited extraordinarily larger λ values than λcal in the range of >30 vol%. Moreover, the λ s of SD/Ag films with uniform dispersion of Ag-MPs are almost equivalent to those of b-SF/Ag films in which Ag-MPs are selectively dispersed in the SD phase. In contrast, the λ s of SIM/Ag films with homogeneous dispersion accord well with the λcal and much smaller than those of SD/Ag and b-SF/Ag. These facts indicate that effective thermal conductive paths were spontaneously generated in SD/Ag films as well as in b-SF/Ag films.