Abstract
In this study, we demonstrate an effective approach based on a simple processing method to improve the thermomechanical properties of graphene polymer composites (GPCs). Edge-selectively functionalized graphene (EFG) was successfully obtained through simple ball milling of natural graphite in the presence of dry ice, which acted as the source of carboxyl functional groups that were attached to the peripheral basal plane of graphene. The resultant EFG is highly dispersible in various organic solvents and contributes to improving their physical properties because of its unique characteristics. Pyromellitic dianhydride (PMDA) and 4,4′-oxydianiline (ODA) were used as monomers for constructing the polyimide (PI) backbone, after which PI/EFG composites were prepared by in situ polymerization. A stepwise thermal imidization method was used to prepare the PI films for comparison purposes. The PI/EFG composite films were found to exhibit reinforced thermal and thermo-mechanical properties compared to neat PI owing to the interaction between the EFG and PI matrix.
Highlights
Polymer composites using graphene derivatives as filler have been studied with the aim of practical application in a wide range of academic and industrial fields [1,2,3,4,5]
Polymer composites using graphene fillers modified by the traditional chemical methods are problematic in that they are unable to provide any reinforcement
We report a series of graphene polymer composites (GPCs) using edge-selectively functionalized graphene (EFG) as a reinforcement filler and polyimide (PI), which is one of the outstanding polymer materials, as a matrix polymer [33,34,35]
Summary
Polymer composites using graphene derivatives as filler have been studied with the aim of practical application in a wide range of academic and industrial fields [1,2,3,4,5] In addition to their superior mechanical and electrical properties, because of the advantage of granting suitable physical and chemical characteristics for specific purposes, utilizing them as materials with excellent future prospects has been attracting much attention [6,7,8,9,10,11,12,13,14,15]. Polymer composites using graphene fillers modified by the traditional chemical methods are problematic in that they are unable to provide any reinforcement
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