کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
5180545 | 1502547 | 2015 | 8 صفحه PDF | دانلود رایگان |
- PBI/MWCNT composite films were manufactured by a facile solution casting.
- Composites with >0.3Â wt% MWCNT exhibited excellent electric heating performance.
- Rapid electric heating rate and excellent electric power efficiency were achieved.
- Composite films were thermally stable up to â¼450 °C even in air atmosphere.
- Composite films can be applied as high performance electric heating materials.
Thermally stable polybenzimidazole (PBI)-based composite films filled with different pristine multiwalled carbon nanotube (MWCNT) contents of 0.0-10.0 wt% were manufactured by a facile solution casting, and their microstructural features, thermal and electrical properties were investigated as a function of the MWCNT content. Electron microscopic images and FT-IR spectra of the composite films confirmed that each MWCNT was wrapped with PBI chains by Ï-Ï interaction and thus they were well dispersed in the PBI matrix. Thus, the electrical resistivity of the composite films decreased considerably from â¼107 Ω cm to â¼10â1 Ω cm with the increment of the MWCNT content, especially at a certain percolation threshold of â¼0.25 wt% MWCNT. The composite films containing above 0.3 wt% MWCNT contents exhibited excellent electric heating performance. For instance, the composite film with 10.0 wt% MWCNT exhibited low temperature growth/decay time constant of â¼1 s, stable maximum temperatures of 40-220 °C, and high electric power efficiency of â¼7.32 mW/°C under the relatively low applied voltages of 5-25 V. Thermogravimetric analysis revealed that the composite films were thermally stable up to â¼450 °C under air environment. It is thus reasonable to contend that PBI/MWCNT composite films can be used as high performance electric heating materials in emerging application areas.
Journal: Polymer - Volume 59, 24 February 2015, Pages 102-109