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A Novel Polymeric Coating with High Thermal Conductivity

2009; Marcel Dekker; Volume: 48; Issue: 12 Linguagem: Inglês

10.1080/03602550903159051

1525-6111

Wenying Zhou, Demei Yu, Qunli An,

Dielectric materials and actuators

Abstract A novel polymeric coating with high thermal conductivity was prepared using a hydroxyl-terminated polydimethylsiloxane-modified epoxy resin and hybrid aluminum nitride (AlN) particles with various sizes. It was found that the coating exhibited a maximum thermal conductivity of 1.78 W/m K at 50 wt% filler content and a preferable mass ratio. This was a result of the synergistic effect of hybrid fillers giving rise to a better heat conduction capability as opposed to a coating without fillers. Furthermore, thermogravimetric analysis revealed that the coating exhibited an excellent high temperature resistance owing to the modified matrix and interaction between filler and matrix; and a dielectric study demonstrated that the dielectric constant, volume resistivity and dielectric strength of the coating at 50 wt% filler concentration were 5.6, 8.2 × 1013 Ω·cm and 12 kV/mm, respectively. In addition, the mechanical properties declined obviously with filler content. Keywords: Dielectric constantHigh temperature resistanceMechanical propertyModified epoxyThermal conductivity ACKNOWLEDGMENTS This study was financially supported by the China Postdoctoral Science Foundation (No. 20070421113, No. 200801434) and the 4th Research Academy of China Aerospace Science and Technology Corporation (CASTC).