Effects of Orientational Relaxation of Polymer Chains Induced by Isotropic Particles on the Enhanced Thermal Conductivity of AlN-filled Polyimide Films
Effects of Orientational Relaxation of Polymer Chains Induced by Isotropic Particles on the Enhanced Thermal Conductivity of AlN-filled Polyimide Films
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DOI：
10.2494/photopolymer.27.193
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发表时间：
2014-07
影响因子：
0.8
通讯作者：
M. Tanimoto;S. Ando
中科院分区：
文献类型：
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作者：
M. Tanimoto;S. Ando
A series of composite films composed of m-sized aluminum nitride (AlN) particles and polyimides (PIs) were fabricated using (a) rigid-chain sBPDA-PPD (sBPPD) PI and (b) flexiblechain sBPDA-ODA (sBPOD) PI as matrices. The relationship between their morphological structures and thermophysical properties were investigated by analyzing cross-sectional SEM images and by measuring out-of-plane thermal conductivity (TC ) and in-plane coefficients of thermal expansion (CTE//). The sBPPD chains exhibited a better polymer-filler packing behavior due to their rigid structure having small free volume. Both TC and CTE// of AlN-filled sBPPD films showed positive deviations from theoretical predictions, whereas no such behavior was observed in AlN/sBPOD composites or in sBPPD films filled with highly anisotropic hexagonal boron nitride (hBN) flakes. The enhanced TC and CTE// observed for the sBPPD composites can be attributed to a significant change in the orientational state of the PI chains; in-plane orientated sBPPD chains in the pristine PI film become distorted by incorporation of isotropic AlN particles.
