The effect of different hard segments in polyurethane on the electrical conductivity of polyurethane grafted multi-walled carbon nanotube/polyurethane nanocomposites
- Authors
- Yun, Sungjin; Im, Hyungu; Kim, Jooheon
- Issue Date
- Jul-2011
- Publisher
- ELSEVIER SCIENCE SA
- Keywords
- Polymer-matrix composites; Carobn nanotube; Polyurethane; Electro-conductivity; Percolation threshold
- Citation
- SYNTHETIC METALS, v.161, no.13-14, pp 1361 - 1367
- Pages
- 7
- Journal Title
- SYNTHETIC METALS
- Volume
- 161
- Number
- 13-14
- Start Page
- 1361
- End Page
- 1367
- URI
- https://scholarworks.bwise.kr/cau/handle/2019.sw.cau/21446
- DOI
- 10.1016/j.synthmet.2011.05.001
- ISSN
- 0379-6779
- Abstract
- Polyurethane (PU) grafted multi-walled carbon nanotubes (MWNTs) (PU-g-MWNTs) containing different hard segments (hexamethylene diisocyanate, HDI, and methylenediphnyl 4,4'-diisocyanate, MDI) were synthesized to fabricate an electro-conducting nanocomposite. The PU conducting nanocomposites were obtained using a simple blending method. PU-g-MWNTs can improve the interfacial compatibility between the MWNTs and PU matrix. The HDI-based PU nanocomposite showed enhanced dispersibility of the functionalized MWNTs than the MDI-based nanocomposite. The difference in dispersity was related to its electrical conductivity. The critical concentration of the MDI-based nanocomposite was lower than the HDI-based nanocomposite because less dispersed and more aggregated MWNTs partially formed a conducting path at a lower concentration. The critical exponent of the HDI-based nanocomposite revealed that the better dispersed MWNTs exhibited enhanced electrical conductivity, compared to the MDI-based nanocomposite, as the filler concentration was increased. (C) 2011 Elsevier B.V. All rights reserved.
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