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Title
Japanese:Thermal diffusivity of hexagonal boron nitride composites based on cross-linked liquid crystalline polyimides. 
English:Thermal diffusivity of hexagonal boron nitride composites based on cross-linked liquid crystalline polyimides. 
Author
Japanese: Yu Shoji, Tomoya Higashihara, Masatoshi Tokita, Junko Morikawa, Junji Watanabe, Mitsuru Ueda.  
English: Yu Shoji, Tomoya Higashihara, Masatoshi Tokita, Junko Morikawa, Junji Watanabe, Mitsuru Ueda.  
Language English 
Journal/Book name
Japanese:ACS applied materials & interfaces 
English:ACS applied materials & interfaces 
Volume, Number, Page Vol. 5    No. 8    pp. 3417-23
Published date Apr. 2013 
Publisher
Japanese: 
English: 
Conference name
Japanese: 
English: 
Conference site
Japanese: 
English: 
Official URL http://pubs.acs.org/doi/abs/10.1021/am400460p
 
DOI https://doi.org/10.1021/am400460p
Abstract Hexagonal boron nitride (h-BN) composites with the oriented cross-linked liquid crystalline (LC) polyimide have been developed as high thermally conductive materials. Well-dispersed h-BN composite films were obtained, as observed by scanning electron microscopy. The morphology of the composite films was further investigated in detail by the wide-angle X-ray diffraction. The obtained composite films based on the cross-linked LC polyimide showed that the polymer chains vertically aligned in the direction parallel to the films, while those based on the amorphous polyimide showed an isotropic nature. Moreover, the alignment of the cross-linked LC polyimides was maintained, even after increasing the volume fraction of h-BN. This alignment plays an important role in the effective phonon conduction between h-BN and the matrices. Indeed, the thermal diffusivity in the thickness direction of the composite films based on the LC polyimide measured by a temperature wave analysis method was increased to 0.679 mm(2) s(-1) at a 30 vol % h-BN loading, which was higher than that based on the amorphous polyimide.

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