Hybrid modification of high‐density polyethylene with hyperbranched polyethylene‐functionalized multiwalled carbon nanotubes and few‐layered graphene

Abstract

Herein, a facile method has been reported to efficiently prepare debundled multiwalled carbon nanotubes (MWCNT) and few‐layered graphene using a hyperbranched polyethylene (HBPE), and as hybrid fillers, their modification effects on high‐density polyethylene (HDPE) are well demonstrated. Stable dispersions of debundled MWCNT and graphene in chloroform were respectively obtained by sonication using the HBPE as stabilizer, and MWCNT/graphene/HDPE ternary nanocomposites were then fabricated by solution‐assisted premixing and subsequent melt mixing, at a fixed mass ratio of MWCNT/graphene of 3:1 and serially changed filler loadings. It is found that the MWCNT and graphene have good dispersibility in the composites, and as hybrid fillers, they can effectively form composite net‐like structure, which makes them show better modification effects on both the electrically and thermally conductive properties of HDPE, as compared to the single MWCNT. © 2017 Wiley Periodicals, Inc. J. Appl. Polym. Sci. 2017, 134, 44848.

Liquid‐Phase Exfoliation of Hexagonal Boron Nitride into Boron Nitride Nanosheets in Common Organic Solvents with Hyperbranched Polyethylene as Stabilizer

“…It is found that the BNNSs have lateral sizes predominately in the range of 0.2–0.5 µm. These sizes are very close to those reported in our previous researches for the graphene flakes exfoliated from graphite with the HBPE as stabilizer in chloroform. They are also within the typical range (0.1–5 µm) often reported in the literature for the BNNSs obtained by liquid‐phase exfoliation methods.…”

“…Moreover, as demonstrated in our earlier research, this structural feature also makes HBPE capable of forming strong noncovalent nonspecific CH–π interactions with MWCNT or graphene surface. This also leads to irreversible HBPE adsorption on both the surface, with HBPE portion reaching 0.20–0.30 g (g CNT) −1 for MWCNTs and 0.40–0.80 g (g graphene) −1 for graphene.…”

“…In our previous researches, it has been found that natural graphite can be efficiently exfoliated into few‐layered graphene in common low‐boiling‐point organic solvents, like tetrahydrofuran (THF) and chloroform, under sonication with a hyperbranched polyethylene (HBPE) as stabilizer. The HBPE can be synthesized via a Pd‐diimine‐catalyzed ethylene polymerization under mild conditions .…”

Preparation of antistatic high‐density polyethylene composites based on synergistic effect of graphene nanoplatelets and multi‐walled carbon nanotubes

“…In the XRD pattern of the pristine GNPs, a sharp peak located at 2θ = 26.52°and a weak peak located at 2θ = 54.68°, corresponding to the (002) and (004) crystal planes, respectively, can be clearly observed . In the XRD pattern of the pristine MWCNTs, a characteristic diffraction peak located at 2θ = 25.42°, corresponding to the (002) crystal plane, can be clearly seen . In the XRD pattern of the HDPE matrix, strong reflection peaks located at 2θ = 21.44° and 23.76°, corresponding to the typical orthorhombic unit cell structure of the (110) and (200) reflection planes, respectively, and weaken peaks located at 2θ = 29.88° and 36.24°, corresponding to the typical orthorhombic unit cell structure of the (210) and (020) reflection planes, respectively, can be clearly seen .…”

Synergistic effect of CB and GO/CNT hybrid fillers on the mechanical properties and fatigue behavior of NR composites

“…Huan Pang 26 fabricated a segregated network with GO and CNT in HDPE, the obvious mechanical reinforcement was ascribed by cooperative effect of GO/CNT hybrid llers. Tiemei Lu 27 prepared excellent thermal conductivity HBPE composites through construct GO-CNT hybrid ller network in HBPE. Hengyi Li 28 mixed the CNT with GO aqueous solution together, and got stable hybrid suspensions due to a surfactant effect of GO and the strong p-p interaction between GO and CNT.…”