1
|
Ishige R. Precise structural analysis of polymer materials using synchrotron X-ray scattering and spectroscopic methods. Polym J 2020. [DOI: 10.1038/s41428-020-0357-2] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
|
2
|
Tanaka K, Ando S, Ishige R. Spontaneous Chain Orientation of Aromatic Polyimides Evolved during Thermal Imidization from Shear-Oriented Glassy Liquid Crystalline Precursors. Macromolecules 2019. [DOI: 10.1021/acs.macromol.9b00953] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Affiliation(s)
- Kazuyuki Tanaka
- Department of Chemical Science and Engineering, School of Materials and Chemical Technology, E4-5, 2-12-1, Ookayama, Meguro-ku, Tokyo 152-8552, Japan
| | - Shinji Ando
- Department of Chemical Science and Engineering, School of Materials and Chemical Technology, E4-5, 2-12-1, Ookayama, Meguro-ku, Tokyo 152-8552, Japan
| | - Ryohei Ishige
- Department of Chemical Science and Engineering, School of Materials and Chemical Technology, E4-5, 2-12-1, Ookayama, Meguro-ku, Tokyo 152-8552, Japan
| |
Collapse
|
3
|
Shoji Y, Higashihara T, Tokita M, Morikawa J, Watanabe J, Ueda M. Thermal diffusivity of hexagonal boron nitride composites based on cross-linked liquid crystalline polyimides. ACS APPLIED MATERIALS & INTERFACES 2013; 5:3417-3423. [PMID: 23506319 DOI: 10.1021/am400460p] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/01/2023]
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.
Collapse
Affiliation(s)
- Yu Shoji
- Department of Organic and Polymeric Materials, Graduate School of Science and Engineering, Tokyo Institute of Technology, 2-12-1 H-120, O-okayama, Tokyo 152-8550, Japan
| | | | | | | | | | | |
Collapse
|
4
|
Shoji Y, Ishige R, Higashihara T, Morikawa J, Hashimoto T, Takahara A, Watanabe J, Ueda M. Cross-Linked Liquid Crystalline Polyimides with Siloxane Units: Their Morphology and Thermal Diffusivity. Macromolecules 2013. [DOI: 10.1021/ma302486s] [Citation(s) in RCA: 26] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- Yu Shoji
- Department
of Organic and Polymeric
Materials, Graduate School of Science and Engineering, Tokyo Institute of Technology, 2-12-1 H-120, O-okayama,
Meguro-Ku, Tokyo 152-8550, Japan
| | - Ryohei Ishige
- Institute for Materials Chemistry
and Engineering, Kyushu University, 744
Motooka, Nishi-ku, Fukuoka 819-0395, Japan
| | - Tomoya Higashihara
- Department
of Organic and Polymeric
Materials, Graduate School of Science and Engineering, Tokyo Institute of Technology, 2-12-1 H-120, O-okayama,
Meguro-Ku, Tokyo 152-8550, Japan
- PRESTO, Japan Science and Technology Agency (JST), 4-1-8, Honcho, Kawaguchi,
Saitama 332-0012, Japan
| | - Junko Morikawa
- Department
of Organic and Polymeric
Materials, Graduate School of Science and Engineering, Tokyo Institute of Technology, 2-12-1 H-120, O-okayama,
Meguro-Ku, Tokyo 152-8550, Japan
| | - Toshimasa Hashimoto
- Department
of Organic and Polymeric
Materials, Graduate School of Science and Engineering, Tokyo Institute of Technology, 2-12-1 H-120, O-okayama,
Meguro-Ku, Tokyo 152-8550, Japan
| | - Atsushi Takahara
- Institute for Materials Chemistry
and Engineering, Kyushu University, 744
Motooka, Nishi-ku, Fukuoka 819-0395, Japan
| | - Junji Watanabe
- Department
of Organic and Polymeric
Materials, Graduate School of Science and Engineering, Tokyo Institute of Technology, 2-12-1 H-120, O-okayama,
Meguro-Ku, Tokyo 152-8550, Japan
| | - Mitsuru Ueda
- Department
of Organic and Polymeric
Materials, Graduate School of Science and Engineering, Tokyo Institute of Technology, 2-12-1 H-120, O-okayama,
Meguro-Ku, Tokyo 152-8550, Japan
| |
Collapse
|