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

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.

Development of an Injectable Shear-Thinning Nanocomposite Hydrogel for Cardiac Tissue Engineering

“…Finally, we observed that the concentration of macromeres significantly enhanced the hydrogel toughness ( p < 0.05). It could be demonstrated that enhanced physical cross-linking of hydrogels led to considerably improved mechanical toughness [ 28 , 30 ].…”

“…In that order, ester groups of Ad and GO at 1710 cm −1 and 1285 cm −1 were identified with the C=O and C-O bonds. The peaks at 3420, 1540, 1285, and 1140 cm −1 were also identified as GO distinctive peaks [ 30 , 34 ]. Three peaks on the CD were also found at 3405, 2920, and 1250 cm −1 , respectively, corresponding to the catechol, C-H, and C-O stretching of ether.…”

Improving the toughness of polycyanate ester by adding epoxy pre‐polymer with different molecular weights

“…However, how PreEP with an uncured epoxy group reacts with CE still warrants discussion. As shown in Figure 2 (Table S1), the CE and EP/CE systems have only one curing exothermic peak in the reaction process, [15,42] while the PreEP/CE system has two peaks. Both exothermic peaks of PreEP/CE move to low temperatures when the PEA content increases.…”

“…Most methods of toughening polycyanate ester entail adding inorganic materials (aligned carbon nanotube bundles [ACNTB], [12] polyhedral oligosilsesquioxane [POSS)], [3,13,14] and graphene oxide [15] ) or polymers, [2,10,16,17] to the cyanate resin. Blending with inorganic materials can diminish the mechanical properties of the polycyanate ester [11][12][13] because of dispersion problems due to the presence of inorganic material in the resin matrix.…”

Preparation of hybrid cyanate ester resin in the presence of polysilazane and its properties

“…1 –7 It is usually used as a resin matrix for advanced composites, adhesives and coatings used in the electronics, aerospace and military industries. 8 –10 To meet the process requirements of these practical applications, it is necessary for bisphenol-A dicyanate ester to have good processability, including film-forming properties, melting fluidity and a wide processing window. However, the bisphenol-A dicyanate ester monomer (BADCy) has a symmetrical structure and is a powdery crystal at room temperature, which can not be used directly in the actual process, and is usually transformed into a prepolymer via thermal prepolymerization to improve its processability and controllability of use.…”