Improvement of Thermal conductivity using Phase separation of polyimide
발표자
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초록
내용
The thermal conductivity along the out-of-plane direction in polyimide (PI) blend films containing amorphous Boron Nitride (BN) was investigated. PI blend films composed of a sulfur-and a fluorine-containing PI were prepared via spin-coating and thermal curing of precursor solutions containing BN. Microphase-separated structures with ‘‘vertical double percolation (VDP)’’ morphology were spontaneously formed in the films, in which two phases were separately aligned along the out-of-plane direction, and BN were preferentially interacted in the sulfur-containing PI phase. The blend film exhibits 350% enhancement of thermal conductivity at 25 vol% of BN, whereas only 90% enhancement was observed in the monophase PI film containing homogeneously dispersed BN. These results indicate that the VDP structure with selective incorporation of BN functions as an effective thermal conductive pathway.