Jeevananda, T. and Kim, Nam Hoon and Lee, Joong Hee and Basavarajaiah, S. and Urs, Deepa M. V. and Ranganathaiah, C. (2009) Investigation of multi-walled carbon nanotube-reinforced high-density polyethylene/carbon black nanocomposites using electrical, DSC and positron lifetime spectroscopy techniques. Polymer International, 58 (7). pp. 775-780. ISSN 1097-0126
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BACKGROUND: The positive temperature coefficient (PTC) effect on material properties has attracted much attention in recent years due to the prospects of many applications like temperature sensors, thermistors, self-regulating heaters, etc. It has been suggested that incorporation of multi-walled carbon nanotubes (MWNTs) into carbon black (CB)-filled polymers could improve the electrical properties of composites due to high conductivity and network structure and significantly reduce the required CB loading. RESULTS: We observed no change in melting temperature and crystalline transition temperature on addition of MWNTs. However, the heat of fusion decreases as the amount of conducting carboxylated MWNT (c-MWNT) filler increases and the resistivity of the composite decreases. The free volume shows an increase up to 1.5 wt% of c-MWNT content and then decreases. CONCLUSION: Well-developed crystals could not be formed due to restricted chain mobility as filler content increases. This results in minimum intermolecular interactions, and thus a decreased heat of fusion. A composite with c-MWNT content of 0.5 wt% showed the highest PTC and higher resistivity at 150 degrees C possibly due to the formation of flocculated structures at elevated temperature. For filler content greater than 1.5 wt%, the decrease in free volume may be due to restricted chain mobility. (C) 2009 Society of Chemical Industry
| Item Type: | Article |
|---|---|
| Uncontrolled Keywords: | nanocomposite; high-density polyethylene; carbon nanotubes; positron annihilation; free volume holes |
| Subjects: | D Physical Science > Physics |
| Divisions: | Department of > Physics |
| Depositing User: | Users 19 not found. |
| Date Deposited: | 23 Aug 2019 09:24 |
| Last Modified: | 23 Aug 2019 09:24 |
| URI: | http://eprints.uni-mysore.ac.in/id/eprint/6959 |
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