Novel silica tube/polyimide composite films with variable low dielectric constant

Yi He Zhang, Sheng Guo Lu, Yuan Qing Li, Zhi Min Dang, John Haozhong Xin, Shao Yun Fu, Guang Tao Li, Rui Rong Guo, Lai Feng Li

Research output: Journal article publicationJournal articleAcademic researchpeer-review

117 Citations (Scopus)


The synthesis of silica tubes (ST) by self-assembly and preparation of the ST/PI composite films by mixing the ST and polyimides (PI) precursors in a solution of N,N-dimethylacetamide (DMAc) were discussed. The mixture was thermally imidized from 50 to 300°C to form ST/PI composite films. The dielectric constant of the composite was reduced from about 3.3 for pure PI to 2.9 for the 3 wt.- % ST/PI composite. Analysis shows that the low dielectric constant is ascribed to the effect of air stored in the silica tubes, pores and interfaces between the ST and the PI matrix in the composite.
Original languageEnglish
Pages (from-to)1056-1059
Number of pages4
JournalAdvanced Materials
Issue number8
Publication statusPublished - 18 Apr 2005

ASJC Scopus subject areas

  • Materials Science(all)
  • Mechanics of Materials
  • Mechanical Engineering


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