Carbon, August, 2013, Vol.60, p.366(13)
To link to full-text access for this article, visit this link: http://dx.doi.org/10.1016/j.carbon.2013.04.049 Byline: Matthias M.L. Arras, Christoph Schillai, Thomas F. Keller, Robert Schulze, Klaus D. Jandt Abstract: Aligned multi-wall carbon nanotube (MWCNT)/polymer composite films were created in a one-step process. 5wt% MWCNT/semi-crystalline polymer composite films of approximately 100nm thickness were obtained by melt-drawing. The matrix polymers were isotactic polypropylene (iPP), poly(1-butene) (PB-1) and high density polyethylene (HDPE). Transmission electron microscopy (TEM) investigations revealed an exceptionally high degree of local MWCNT alignment with an angular deviation of 〈10[degrees] (HDPE) and 〈20[degrees] (iPP and PB-1) parallel to the films' drawing direction for a broad range of drawing velocities. For HDPE, the lamellar polymer-crystals at the interface between the MWCNT and the polymer film were identified as the nano-hybrid shish-kebab morphology by selected area electron diffraction. Based on the direct visualization of the MWCNT disentanglement process in the TEM, a polymer physics-based model for the unraveling of MWCNT entanglements, a source of aligned MWCNTs, is proposed that explains differences in MWCNT alignment encountered for different matrix polymers. The melt-drawing mediated MWCNT alignment provides both an innovative approach for the fabrication of applicable MWCNT containing films and a versatile tool for studying the interface in MWCNT/polymer composites. Article History: Received 19 October 2012; Accepted 13 April 2013
Butylene -- Analysis ; Nanotubes -- Analysis ; Polyethylene -- Analysis
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