Journal of Materials Science

, Volume 53, Issue 20, pp 14299–14310 | Cite as

Improved thermal conductivity of polydimethylsiloxane/short carbon fiber composites prepared by spatial confining forced network assembly

  • Xiaoxiang He
  • Yao Huang
  • Ying Liu
  • Xiuting Zheng
  • Semen Kormakov
  • Jingyao SunEmail author
  • Jian Zhuang
  • Xiaolong GaoEmail author
  • Daming WuEmail author


Traditional compounding method is a common way to construct network to improve thermal conductivity (TC) of polymeric composites. However, the TC of the composites increases slowly when the network has been constructed. There is no percolation threshold in TC, unlike in electrical conductivity. Thus, a method of spatial confining forced network assembly (SCFNA) was used to prepare polydimethylsiloxane (PDMS)/short carbon fiber (SCF) composites to improve the TC. The content of SCF ranging from 2 to 18 wt% was used to illustrate availability of SCFNA method. When the content of SCF was 18 wt%, the TC of PDMS/SCF composites prepared by SCFNA method increased by 7.79 times over the TC of PDMS/SCF composites prepared by traditional compounding method and 10.93 times over the TC of pure PDMS. Comparing the SEM of PDMS/SCF composites prepared by SCFNA method with that prepared by traditional compounding method, the gap between fillers of former was much smaller than that of latter. Moreover, the gap decreased when compression ratio increased. Therefore, the TC of composites prepared by SCFNA method could be improved significantly compared with traditional methods, which provides the possibility to replace thermally conductive materials such as metal with polymeric composites.



This work was supported by the National Nature Science Foundation of China (Grant No. 51673020) and by the Fundamental Research Funds for the Central Universities (Grant Nos. ZY1812, JD1810).


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Authors and Affiliations

  1. 1.College of Mechanical and Electrical EngineeringBeijing University of Chemical TechnologyBeijingChina
  2. 2.State Key Laboratory of Organic–Inorganic CompositesBeijing University of Chemical TechnologyBeijingChina
  3. 3.Polymer Material Processing Equipment Engineering Research Center of the Ministry of EducationBeijingChina

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