Flexible polyurethane composites prepared by incorporation of polyethylenimine-modified slightly reduced graphene oxide

A comparison of thermoplastic polyurethane incorporated with graphene oxide and thermally reduced graphene oxide: Reduction is not always necessary

“…By the addition of a two‐dimensional filler, the thermal stability of TPU composites was usually improved, which was contributed by the so‐called “tortuous path” effect . It is believed the well‐dispersed two‐dimensional fillers can prolong the path for the diffusion of degradation products, hence improving the thermal stability.…”

“…To confirm GO containing oxygen‐containing groups is more suitable as a filler for TPU composites, pure TPU, GO‐filled TPU composites, and TGO‐filled TPU composites were successfully prepared by a solution mixing strategy. Typically, GO was obtained from NG powders (Huadong Graphite Factory, Pingdu, China) by a modified Hummer method, and the details have been depicted in references . The commercial TPU with a grade name of Skythane R180A was supplied by SK chemicals and the chemical structure of pure TPU is ‐[‐CO‐NH‐R′‐NH‐CO‐O‐R‐] n ‐.…”

“…Therefore, it can be inferred that there is a compromise between the reduction degree and the enhancement effect. In previous work, we found that GO exhibited higher enhancement than RGO in terms of mechanical properties, for polyurethane composites . The interfacial interaction between polyethyleneimine modified slightly RGO and polyurethane as well as the negative effect of reduction on GO are witnessed.…”

Effect of polyaspartic acid‐functionalized graphene oxide on the mechanical performance of polyimide‐based composites

“…7 Zhang et al achieved 139% increase in tensile strength and 33% increase in Young's modulus for 1.0 wt % graphene-reinforced fluorographene-reinforced PI composite films. [11][12][13][14][15] Furthermore, many macromolecular chains, such as polybenzimidazole, 16 polyaniline, 17 poly(vinylidene fluoride) (PVDF), 18 polyethylenimine, 19 and polyurethane 20 can anchor on these functional groups. 9 Graphene is a robust two-dimensional (2D) layer structure consisting of a hexagonal single-atom-thick nanosheet network of sp 2 -hybridized carbon atoms.…”

“…As one derivative of graphene, GO nanosheets possess many oxygen-containing functional groups on its surface and edges, which can help to improve the dispersibility of graphene considerably. [11][12][13][14][15] Furthermore, many macromolecular chains, such as polybenzimidazole, 16 polyaniline, 17 poly(vinylidene fluoride) (PVDF), 18 polyethylenimine, 19 and polyurethane 20 can anchor on these functional groups. Percec et al obtained polypyrrole/GO hybrid composites by using ammonium persulfate as an oxidant.…”