Adamantane-Modified Graphene Oxide for Cyanate Ester Resin Composites with Improved Properties

Zhicong Miao,Zhiqiang Su,Peng Li,Tianjiao Liu,Gang Wei,Juntao Shi

doi:10.3390/app9050881

Zhicong Miao, Zhiqiang Su + Show 4 more

Open Access

https://doi.org/10.3390/app9050881

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Abstract

The conjugation of graphene and polymers has attracted great attention for the fabrication of functional hybrid nanomaterials. Here, we demonstrate the modification of graphene oxide (GO) with adamantane (AMT) through the diimide-activated amidation reaction. The modification of GO with AMT improves the dispersion and decreases the interfacial polarization of GO, causing a lower dielectric constant for the fabricated GO/AMT hybrid materials. The structures of GO/AMT were studied by Fourier transform infrared spectroscopy and Raman spectroscopy. Furthermore, the mechanical properties, thermal stability, and dielectric constant of GO/AMT composites were measured at a low cured temperature using various techniques, such as differential scanning calorimetry, thermogravimetric analysis, and dynamic mechanical thermal analysis. It was found that the synthesized GO/AMT materials with different contents were blended into cyanate ester (CE) resins, resulting in a lower cure temperature, smaller dielectric constant, higher thermal stability, and stronger water resistance. It is expected that this novel GO/AMT-CE material will have potential applications for replacing traditional thermosetting resins.

Highlights

Cyanate esters (CEs) are one kind of high-performance thermosetting resins, which have many advantages, such as high glass transition temperatures (Tg), good mechanical properties, high fracture toughness, and low moisture absorption
The morphology of graphene oxide (GO) nanosheets was characterized by Atomic force microscopy (AFM) and Transmission electron microscopy (TEM) (Figure 2)
It can be seen from the AFM image that the thickness of the GO layer is about 1 nm, which is consistent with the previous results [18]

Summary

Introduction

Cyanate esters (CEs) are one kind of high-performance thermosetting resins, which have many advantages, such as high glass transition temperatures (Tg) (from 250 to 300 ◦ C), good mechanical properties, high fracture toughness, and low moisture absorption. The dielectric properties of CEs are superior to all other existing thermosetting resins [1,2,3]. CEs have some disadvantages, such as a high cure temperature and brittle structure, which limits their applications in many fields. To overcome the disadvantages of CEs, one of the facile method is to modify CEs to improve their overall performance [6,7,8,9,10,11].

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