Thermal properties and thermal stability of polypropylene composites filled with graphene nanoplatelets

Abstract

The thermal properties and thermal stability of polypropylene (PP) composites separately filled with graphene nanoplatelets (GNPs) with three different sizes were measured using a differential scanning calorimetry and a thermal gravimetric analyser. The results showed that the values of the melting temperature of the composites were higher than that of the unfilled PP; the thermal stability increased with increasing the weight fraction and lateral dimension of GNPs in the case of low filler concentration, while the effect of the GNPs thickness on the thermal stability was insignificant; the onset decomposition temperature increased with increasing the GNPs lateral dimension, while the maximum thermal decomposition rate increased first and then decreased with increasing the GNPs weight fraction. The thermal stability improvement should be attributed to the sheet barrier function of the GNPs.

Enhanced mechanical and thermal properties of electrically conductive TPNR/GNP nanocomposites assisted with ultrasonication

“…The residue amounts were about the weight fractions of GNP which clearly means that the GNP was not burnt off at the temperatures below 600°C as a result of the inert atmosphere [26]. This is similar to the research study of Liang et al [27] who stated the residues found in PP/GNP composites were mainly the GNP.…”

PECVD application to obtain polymer coated graphene nanoplatelets and development of new epoxy nanocomposites

“…Two different types of composites were prepared with unmodified (u-GNP) and modified GNPs (PGMA-GNP). A small amount of graphene can significantly improve the mechanical, electrical, and thermal properties of polymer composite materials [26]. Therefore, GNPs were dispersed into the epoxy matrix in 0.1, 0.3, 0.5, 1.5, and 2.0 wt% by using a mechanical stirrer and ultrasonic bath at 60 °C for 1 h. After dispersion, the curing agent (30 wt%) and accelerator (1.0 wt%) were added.…”

Improvement of electrical, thermal, and mechanical properties of poly(methyl methacrylate)/poly(ethylene oxide) blend using graphene nanosheets

“…Graphene, as a monolayer of carbon atoms arranged in a honeycomb network, has recently attracted tremendous attention in the fields of fundamental and applied due to its outstanding physical, chemical, and mechanical properties. 1 –5 The discovery of new nanomaterial graphene by Andre Geim 6 in 2004 with its unique properties has created a new class of polymer nanocomposites and expanded the application of polymers. 7 Polymers have an important role in the industrial applications, but the increasing demand of materials for advanced applications cannot be provided by simple homopolymers.…”