Nanocomposites based on polyurethanes and carbon nanoparticles: preparation, properties and application

Conductive polymer foams with carbon nanofillers – Modeling percolation behavior

“…For instance, they can simultaneously enhance the mechanical properties and electrical conductivity at very low filler content (i.e. <0.1 wt%) [6][7][8][9]. Xu et al [2] described the fabrication of conductive polyurethane composites containing CNTs with density of around 0.05 g/cm 3 , observing a density-dependent conductor-insulator transition which defines the limit of weight reduction for a conductive composite foam.…”

Functional shape memory composite nanofibers with graphene oxide filler

“…That is because GO improves the stiffness of the composite SMPU nanofibers from macroscope level whilst GO, as "crosslinking points", can prevent the stretch and contraction of SMPU chains. In other words, SMPU molecular chains cross-linked with GO sheets are not 14 free to shrink and can get stabilized much more quickly for reaching the final structure [47,48].…”

“…However, SMPU still has some disadvantages, such as poor surface wettability, insufficient SME and mechanical strength. In order to address such disadvantages, the reinforcing fillers are often incorporated to improve the corresponding properties of the SMPU [14,15]. In addition, in relation to the biomedical application of SMPU, it is better that the thermal transition temperature (T trans ) is close to the physiological temperature which can be as either a glass transition temperature (T g ) or or a melting temperature (T m ), while the later one regarding as T trans is generally preferred due to the sharp transition with narrow window and better shape recovery [16,17].…”

Novel applications of castor oil based polyurethanes: a short review

“…Earlier polyurethane nano composites were prepared by solvent casting and in situ polymerization techniques. Amongst the various fillers used in this synthesis, clay [14], carbon nanotubes [15], TiO 2 [16], silicates [17], zirconium phosphonates [20], fullerene and graphene nanostructures [18] are well known. For instance, R. Zhang et al synthesized car bon nanotubes as conductive filler to improve the elec trical properties of polymer composites by using perco lation thresholds [15].…”