SWNTs polyethylene -SWNT composites

Polymer nanocomposites with medium density polyethylene were reported with a variety of fluorinated and un-fluorinated nanotubes (37). The nanocomposites consisting of 1 wt% F-SWNT-C H (fluorinated and surface treated nanotubes) nanotubes showed an increase in tensile strength by 52.4%, modulus by 15.9% and elongation by 18.9% as compared to the pure polymer. The composites with 1 wt% F-SWNT-CnH23 (fluorinated and surface treated nanotubes) had an increase of 28.3% in modulus as compared to the pure polymer. The tensile strength also increased from 4.33 MPa for the pure polymer to 5.01 Mpa for the nanocomposite, the elongation at... 

When seeking a polymer material for a CNT-based strain gauge, ductility and ease of processing are the key requirements. For that reason, polymethyl methacrylate (PMMA) and polyethylene (PE) are two candidate materials. Studies on the electrical conductivities of CNT-PMMA composites reported minimum percolation thresholds ranging from 0.084 to 1.3 wt% which depend on the type of CNT (SWNT or MWNT) and the dispersion technique. Such values are much lower than percolation thresholds reported for CNT-PE which rise up to 15 wt% (38). As a consequence, much higher conductivity values were reported for CNT-PMMA composites. For this reason, a PMMA matrix will be considered for the current... 

As discussed in Section 10.2.3, PVP and DNA have been used to wrap and water-solublize SWNTs. For specific actuator, electrical and electro-optic applications, SWNTs have been wrapped by piezoelectric polyvinylidene fluoride and trifluor-oethylene copolymer [50] or with conjugated polymers [51, 52]. The conjugated polymer used to form a composite with MWNTs and an electron-transport layer in light-emitting diodes is poly(m-phenylene-vinylene-co-2,5-dioctyloxy-p-phenylene-vinylene) (PmPV) [53]. Wrapping coupled with electron doping has been achieved with polyethylene imine to form p-n junction devices ([40], see footnote 1). 

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