Thermally Conductive Polyimide/Boron Nitride Composite Films with Improved Interfacial Compatibility Based on Modified Fillers by Polyimide Brushes

Meng-Yan Gao; Lei Zhai; Song Mo; Yan Jia; Yi Liu; Min-Hui He; Lin Fan

doi:10.1007/s10118-023-2985-4

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Thermally Conductive Polyimide/Boron Nitride Composite Films with Improved Interfacial Compatibility Based on Modified Fillers by Polyimide Brushes

RESEARCH ARTICLE | Updated：2023-11-27

- Thermally Conductive Polyimide/Boron Nitride Composite Films with Improved Interfacial Compatibility Based on Modified Fillers by Polyimide Brushes
- Thermally Conductive Polyimide/Boron Nitride Composite Films with Improved Interfacial Compatibility Based on Modified Fillers by Polyimide Brushes
- 高分子科学（英文版） 2023年41卷第12期页码：1921-1936
- Affiliations：
  
  a.Key Laboratory of Science and Technology on High-tech Polymer Materials, Institute of Chemistry, Chinese Academy of Sciences, Beijing 100190, China
  b.School of Chemical Sciences, University of Chinese Academy of Sciences, Beijing 100049, China
- Author bio：
  
  zhailei@iccas.ac.cn (L.Z.)
  fanlin@iccas.ac.cn (L.F.)
- Funds：
  
  This work was financially supported by the Natural Science Foundation of Beijing (No. 2202068), the National Natural Science Foundation of China (No. 51803221) and National Key Research and Development Program (No. 2022YFB3603105). We thank Prof. Xinghua Zheng from Institute of Engineering Thermophysics, Chinese Academy of Sciences, for his great help in the in-plane thermal conductivity test of films. We also thank Prof. Jin Zhao from Beijing Center for Physical and Chemical Analysis, for her great help in the thermal conductivity test of films.;Electronic supplementary information (ESI) is available free of charge in the online version of this article at http://doi.org/10.1007/s10118-023-2985-4.
- DOI：10.1007/s10118-023-2985-4
  中图分类号：
- 收稿：2023-03-01，
  
  修回：2023-3-22，
  
  录用：2023-4-3，
  
  网络首发：2023-05-18，
  
  纸质出版：2023-12-01
- Accepted：
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Gao, M. Y.; Zhai, L.; Mo, S.; Jia, Y.; Liu, Y.; He, M. H.; Fan, L. Thermally conductive polyimide/boron nitride composite films with improved interfacial compatibility based on modified fillers by polyimide brushes. Chinese J. Polym. Sci. 2023, 41, 1921–1936

Meng-Yan Gao, Lei Zhai, Song Mo, et al. Thermally Conductive Polyimide/Boron Nitride Composite Films with Improved Interfacial Compatibility Based on Modified Fillers by Polyimide Brushes[J]. Chinese Journal of Polymer Science, 2023, 41(12): 1921-1936.
Gao, M. Y.; Zhai, L.; Mo, S.; Jia, Y.; Liu, Y.; He, M. H.; Fan, L. Thermally conductive polyimide/boron nitride composite films with improved interfacial compatibility based on modified fillers by polyimide brushes. Chinese J. Polym. Sci. 2023, 41, 1921–1936 DOI： 10.1007/s10118-023-2985-4.

Meng-Yan Gao, Lei Zhai, Song Mo, et al. Thermally Conductive Polyimide/Boron Nitride Composite Films with Improved Interfacial Compatibility Based on Modified Fillers by Polyimide Brushes[J]. Chinese Journal of Polymer Science, 2023, 41(12): 1921-1936. DOI： 10.1007/s10118-023-2985-4.

摘要

Boron nitride is chemically modified by polyimide brushes that are grafted on the filler surface. Interfacial compatibility between filler and matrix is greatly improved. Tensile strength of polyimide/boron nitride composite film is up to 80 MPa even at 50 wt% filler content. Both out-of-plane and in-plane thermal conductivity are over 0.8 W/(m·K).

Abstract

Polyimide-based composite films with high thermal conductivity

good mechanical property and electrical insulating performance are urgently needed in the electronics and microelectronics fields. As one of the key technical challenges to be solved

interfacial compatibility between filler and matrix plays an important role for composite film. Herein

boron nitride was modified by grafting polyimide brushes

via

a two-step method

and a series of thermally conductive polyimide/ boron nitride composite films were prepared. Both characterization and performance results proved that the interfacial interaction and compatibility was greatly enhanced

resulting in a significant reduction in defects and interfacial thermal resistance. The interphase width of transition zone between two phases was also efficiently enlarged due to polyimide brushes grafted on filler surface. As a result

composite films based on polyimide-grafted boron nitride exhibited significantly improved properties compared with those based on pristine filler. Tensile strength can reach up to 80 MPa even if the filler content is as high as 50 wt%. The out-of-plane and in-plane thermal conductivity of composite film increased to 0.841 and 0.850 W·m

−1

·K

−1

respectively. In addition

thermal and dielectric properties of composite films were also enhanced to some extent. The above results indicate that surface modification by chemically grafting polymer brushes is an effective method to improve two-phase interfacial compatibility so as to prepare composite film with enhanced properties.

关键词

Keywords

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