Percolation behaviour of polypropylene glycol filled with multiwalled carbon nanotubes and Laponite |
| |
| Authors: | EА Lysenkov NI Lebovka YV Yakovlev VV Klepko NS Pivovarova |
| |
| Affiliation: | 1. Institute of Macromolecular Chemistry, NAS of Ukraine 48, Kharkivske Shause, Kyiv 02160, Ukraine;2. Mykolaiv National University named after V.O. Sukhomlynskiy 24, Nikolska Str., Mykolaiv 54030, Ukraine;3. Institute of Biocolloidal Chemistry named after F. Ovcharenko NAS of Ukraine 42, Vernadskii Prosp., Kyiv 03142, Ukraine;4. National University of Life and Environment Sciences of Ukraine, 15 Geroiv Oborony, Kyiv 03041, Ukraine |
| |
| Abstract: | The percolation behaviour of the hybrid composites of polypropylene glycol (PPG) filled with multiwalled carbon nanotubes (MWCNTs) and Laponite RD (Lap), or with MWCNTs and organo-modified Laponite (LapO) was studied by wide angle X-ray diffraction (XRD), microscopic image analysis, and electrical conductivity measurements. Cetyltrimethylammoniumbromide (CTAB) was used as an organo-modifier of Laponite. The Lap and LapO were found to have rather different affinity to PPG. XRD data have evidenced finite PPG integration inside Lap and complete exfoliation of LapO stacks in a PPG matrix. In PPG + MWCNT composites containing no Lap or LapO, increase of MWCNT concentration above the critical value Cp ∼ 0.4 wt% resulted in percolation. The value of the percolation threshold, Cp, was practically the same for hybrid PPG + MWCNT + Lap composites. However, it noticeably decreased (Cp ∼ 0.2 wt%) in PPG + MWCNT + LapO materials. The observed behaviour of the percolation threshold may be attributed to the effects exerted by LapO on the size of MWCNT aggregates, state of their dispersion and homogeneity of their spatial distribution. |
| |
| Keywords: | A Carbon nanotubes A Hybrid composites A Nanoclays A Nanocomposites B Electrical properties |
| 本文献已被 ScienceDirect 等数据库收录！ |
|
