Graphene/thermoplastic polyurethane nanocomposites: Surface modification of graphene through oxidation, polyvinyl pyrrolidone coating and reduction

Comparative study of dielectric and mechanical properties of HDPE-MWCNT-SiO 2 nanocomposites

“…This is mainly due to the agglomeration of filler at higher loading and thus has a negative impact on the modulus. A similar observation has been made by Li et al [32] in the case of polyurethane nanocomposites. The Sato-Furukawa model appears to be the best fit for experimental results with 'j' value of 0.1, since perfect adhesion (j = 0) is impossible for immiscible blends.…”

Electrical behavior of a graphene/PEKK and carbon black/PEKK nanocomposites in the vicinity of the percolation threshold

“…The conductivity above the per colation threshold is thereby greatly reduced. a 0 is related to the in trinsic conductivity of the pristine GR sheet [26] (generally known at 10 3 S•m -l for carbon particles).…”

“…In order to improve the graphene dispersion in nanocomposites several ex foliation ways are studied. The solvent way, which uses commonly N methyl-2-pyrrolidone [25] or N,N-dimethylformamide [26], is an easy process that can bring high graphene concentration (higher than 1 mg•mL -1 ) but leads to use solvent. An aqueous way have been pro posed with an anionic surfactant as sodium dodecyl sulfate for example.…”

Lightweight conductive graphene/thermoplastic polyurethane foams with ultrahigh compressibility for piezoresistive sensing

“…However, the increase of graphene loading led to wider and shallower endothermic curves and the melting enthalpy of the conductive foam with 3 wt% loading dropped to only 3.383 J g À1 , which might be due to the fact that the addition of graphene inhibited the crystallization of the TPU hard segments, leading to the decrease in the crystalline size of TPU molecules. 28,[47][48][49] As for the influence of graphene on the T g of CPC foams, it can be seen that the T g decreases with increasing graphene content, Fig. 3(b).…”

“…The TPU foams display a strong diffraction peak at a 2y value of 20.51, which is relevant to the existence of a short range regularly ordered structure of both hard and soft domains along with a disordered structure of the amorphous phase of the TPU matrix. 47,50 The XRD patterns of all CPC foams display obviously the peak assigned to the TPU, indicating that the crystal structure of the TPU matrix remains unchanged after the addition of graphene. But the intensity of the peak is attenuated with increasing graphene loading.…”