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- Title
Effect of nitrile-functionalization and thermal cross-linking on the dielectric and mechanical properties of PEN/CNTs-CN composites.
- Authors
Pu, Zejun; Huang, Xu; Chen, Lan; Yang, Jian; Tang, Hailong; Liu, Xiaobo
- Abstract
In this study, a novel series of composite films consisting of nitrile-functionalized carbon nanotubes (CNTs-CN) and poly(arylene ether nitriles) (PEN) were successfully fabricated by the tape-casting method. The -CN groups in PEN chains and the phthalonitrile groups on CNTs-CN formed the thermally stable triazine rings by thermal cross-linking reaction in the presence of diamino diphenyl sulfone, which was characterized by Fourier transform infrared spectroscopy. The result indicated that the chemical cross-linking reaction occurred accompanied by the emergence of a new absorption peak at 1,361 cm. Besides, the effect of cross-linking on the morphology, thermal stability, mechanical and dielectric properties of the PEN/CNTs-CN was investigated. The SEM images showed that the phase interface between surface modified CNTs and PEN matrix was indistinct, and the surface modified CNTs presented a better dispersion behavior in PEN matrix. The mechanical properties of the processed films were improved substantially compared with the unprocessed films. Furthermore, the glass-transition temperature ( T) of composite films processed at 320 °C for 4 h (about 245 °C) was higher than that of composite films before thermal treatment (about 205 °C). The 5 % weight loss temperature of the composite films (processed at 320 °C for 4 h) increased by about 110 °C compared with the composite films (unprocessed). More importantly, by thermal cross-linking, the dielectric constant ( ε) of composite films with 8 wt% CNTs-CN loading was increased from 31.8 to 33.9, and dielectric loss (tan δ) was decreased from 0.90 to 0.61 at 1 kHz.
- Subjects
CARBON nanotubes; TAPE casting; NITRILES; MECHANICAL properties of metals; FOURIER transform infrared spectroscopy; DIELECTRIC properties
- Publication
Journal of Materials Science: Materials in Electronics, 2013, Vol 24, Issue 8, p2913
- ISSN
0957-4522
- Publication type
Article
- DOI
10.1007/s10854-013-1190-6