Multilayer graphene/chlorine-isobutene-isoprene rubber nanocomposites: the effect of dispersion

Abstract

Multilayer graphene (MLG) is composed of approximately 10 sheets of graphene. It is a promising nanofiller just starting to become commercially available. The dispersion of the nanofiller is essential to exploit the properties of the nanocomposites and is dependent on the preparation method. In this study, direct incorporation of 3 parts per hundred of rubber (phr) MLG into chlorine-isobutene-isoprene rubber (CIIR) on a two-roll mill did not result in substantial enhancement of the material properties. In contrast, by pre-mixing the MLG (3 phr) with CIIR using an ultrasonically assisted solution mixing procedure followed by two-roll milling, the properties (rheological, curing, and mechanical) were improved substantially compared with the MLG/CIIR nanocomposites mixed only on the mill. The Young's moduli of the nanocomposites mixed in solution increased by 38%. The CIIR/MLG nanocomposites produced via solution showed superior durability against weathering exposure.

Effects of thinner on RTV silicone rubber nanocomposites reinforced with GR and CNTs

“…However, the thinner decreases roughness from 14 to 11 (Table ) which indicates higher synergy among the GR, CNT and thinner. The high roughness of the H2 specimen is attributed to wrapping of graphitic layers with the polymer chains …”

“…This behavior is attributed to (i) lower reinforcing effect of the filler particles due to migration of thinner towards the polymer chains and an increase in slippage among the interacting components or (ii) due to the lubricating effect of the GR in the presence of liquid thinner. The lower modulus with a high content of CNTs (H4 specimen) is attributed to filler aggregation that makes processing of specimen difficult …”

“…The lower modulus with a high content of CNTs (H4 specimen) is attributed to filler aggregation that makes processing of specimen difficult. [35] From a macroscopic view, the H4 specimen shows fragile boundaries and irreversible losses with an initial width of 10.1 and 8.4 mm after 40% strain. However, this can be minimized by thinner which eases the processing of vulcanizates by lowering the viscosity.…”

“…The high roughness of the H2 specimen is attributed to wrapping of graphitic layers with the polymer chains. [35]…”

Enhanced interfacial interactions of isocyanate‐grafted graphene oxide/nitrile‐butadiene rubber nanocomposites: mechanical and thermo‐physical properties

“…In recent years, graphene oxide (GO) as a 2D nano carbon material, has been intensively studied in various applications for advanced technologies since its discovery, attributing to their excellent properties, such as high thermal conductivity, high mechanical properties, large specific surface area, excellent electromagnetic interference shielding, and electrical conductivity. Moreover, based on the hydroxy and epoxy groups on sp 3 hybridized carbon on the basal plane, and the carbonyl and carboxyl groups located at the sheet edges on sp 2 hybridized carbon, GO could easily form a strong interfacial interaction with polymer molecules , such as epoxy composites , polypropylene , poly(methyl methacrylate) , and various kinds of rubber composites . Normally, considering the excellent hydrophilic property and compatibility with polymer matrix, latex compounding technique (LCT) and solution mixing method are commonly adopted methods to fabricate well dispersed GO/polymer composites.…”