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Abstract
Highly aligned multi-walled carbon nanotube (MWCNT) polymer composites were fabricated via a roll-to-roll milling process; the alignment of the MWCNTs could be controlled by varying the speed of the rotating rolls. The effect of MWCNT alignment on the polymer matrix was morphologically observed and quantitatively characterized using polarized Raman spectroscopy. To provide a more detailed comparison, MWCNT composites with alignment in the transverse direction and random alignment were fabricated and tested. Enhanced mechanical and electrical properties were obtained for the aligned MWCNT composite, which can be attributed to the efficient electrical network and load transfer, respectively. In addition, a cyclic stretching test was conducted to evaluate the piezo-resistive characteristics of the aligned MWCNT composites. The composites with an aligned filler configuration showed an exceptionally high degree of strain sensitivity compared to the other composites.
Highlights
Carbon nanotubes (CNTs) have shown great potential for improving the performance of polymer matrixes when used as a filler, owing to their unique electrical [1,2,3], mechanical [4,5] and thermal [6,7,8]properties
Quantitatively evaluated when uniform multi-walled carbon nanotube (MWCNT) alignment in the composite was achieved via rollas shown in Figure 2, the uniformly aligned MWCNT configuration in the composite and different to-roll milling
The aligned MWCNT composite film circumferential and axial direction were referred to as aligned direction and transverse direction specimens cut in the circumferential and axial direction were referred to as aligned direction and specimens, respectively (Figure 1)
Summary
Carbon nanotubes (CNTs) have shown great potential for improving the performance of polymer matrixes when used as a filler, owing to their unique electrical [1,2,3], mechanical [4,5] and thermal [6,7,8]properties. Carbon nanotubes (CNTs) have shown great potential for improving the performance of polymer matrixes when used as a filler, owing to their unique electrical [1,2,3], mechanical [4,5] and thermal [6,7,8]. Conductive CNT polymer composites demonstrate sensitive changes in electrical resistance under an applied external force, making ideal candidates for strain sensor applications [9,10,11,12]. In previous studies, depending on the alignment direction of the CNTs, the physical properties of CNT composites, such as electrical conductivity, mechanical properties and strain-resistance sensitivity, could be changed [16,17,18,19]. Kaushik et al [10] produced an aligned
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