TY - JOUR
T1 - Effects of chemical structure and morphology of graphene-related materials (GRMs) on melt processing and properties of GRM/polyamide-6 nanocomposites
AU - Gomez, Julio
AU - Villaro, Elvira
AU - Karagiannidis, Panagiotis G.
AU - Elmarakbi, Ahmed
PY - 2020/9/1
Y1 - 2020/9/1
N2 - In this work, different graphene-related materials (GRMs) and polyamide-6 (PA6) were melt compounded by twin screw extrusion. The GRMs prepared were graphene nanoplatelets (GNPs), graphene oxide (GO), reduced graphene oxide (rGO) and silane functionalised reduced graphene oxide (f-rGO). The GRMs had comparable lateral size (20–30 μm), but different thickness and surface chemistry which resulted in different behaviour in processing of melt flow, maximum loading in the PA6 matrix (15%wt for GNPs, 10%wt for GO, 2%wt for rGO and 2.5%wt for f-rGO) as well as mechanical properties. A second extrusion phase produced formulations with lower concentration of GRMs. In the case of f-rGO/PA6, the melt flow index increased by over 76% at 0.5%wt loading compared with the pure PA6 resin, facilitating processing and dispersion of the flakes within the matrix and increasing the Young´s modulus (E) and tensile strength by 39%. However, high filler content above 10% has been achieved only for GNPs improving the Young´s modulus by 50% at 15%wt.
AB - In this work, different graphene-related materials (GRMs) and polyamide-6 (PA6) were melt compounded by twin screw extrusion. The GRMs prepared were graphene nanoplatelets (GNPs), graphene oxide (GO), reduced graphene oxide (rGO) and silane functionalised reduced graphene oxide (f-rGO). The GRMs had comparable lateral size (20–30 μm), but different thickness and surface chemistry which resulted in different behaviour in processing of melt flow, maximum loading in the PA6 matrix (15%wt for GNPs, 10%wt for GO, 2%wt for rGO and 2.5%wt for f-rGO) as well as mechanical properties. A second extrusion phase produced formulations with lower concentration of GRMs. In the case of f-rGO/PA6, the melt flow index increased by over 76% at 0.5%wt loading compared with the pure PA6 resin, facilitating processing and dispersion of the flakes within the matrix and increasing the Young´s modulus (E) and tensile strength by 39%. However, high filler content above 10% has been achieved only for GNPs improving the Young´s modulus by 50% at 15%wt.
KW - Graphene
KW - Graphene oxide
KW - Reduced graphene oxide
KW - Functionalisation
KW - Polyamide-6
KW - Polymer nanocomposites
KW - Twin screw extrusion
U2 - 10.1016/j.rinma.2020.100105
DO - 10.1016/j.rinma.2020.100105
M3 - Article
VL - 7
JO - Results in Materials
JF - Results in Materials
SN - 2590-048X
M1 - 100105
ER -