High‐performance epoxy nanocomposites via constructing rigid structured interphase with epoxy‐rich graphene oxide

Abstract

Epoxy resins, as the most important thermosetting matrix of carbon fiber reinforced polymer (CFRP) composites, are widely used in the structural field, but the highly intrinsic brittleness of epoxy resins greatly limits their application. Therefore, it is urgent to develop new method to prepare high‐performance epoxy composites. In this research, GO riched with rigid short‐chain structure epoxy group on its surface was synthesized by chemically grafting dopamine, hexachlorocyclotriphosphazene and glycidol successively. Then the modified nanofillers were incorporated into the epoxy matrix to prepare high‐performance nanocomposites. The effect of epoxy‐rich GO nanosheets as fillers on mechanical properties of aerospace grade epoxy was studied. The results revealed that the epoxy‐rich GO could effectively optimize the performance of epoxy resins owing to forming the rigid structured interphase. The tensile strength and elongation at break of the nanocomposites were up to 113 MPa and 7.6% with 0.075 wt% additives, respectively, which greatly surpassed the value reported by the limited researches on strengthening epoxy with GO and its derivate nanofillers. Therefore, instructive idea and effective method were provided to obtain high‐performance polymer nanocomposite matrix in this study.

Improving interfacial strength of epoxy composites by constructing “palm‐tree”‐like structure on carbon fiber

“…Details of the synthesis and characterization of GO can be found in our previous publication. [30] Poly(oxypropylene)amines (D400 and D2000) were purchased from Nanjing Huntsman Chemical Co., Ltd (Nanjing, China), with an average molecular weight of 403 g mol À1 . EP resin with an EP value of 0.45-0.55 mol/100 g (E-51) was purchased from Tianjin Jingdong composite material Co., Ltd (Tianjin, China).…”

“…Details of the synthesis and characterization of GO can be found in our previous publication. [30] Poly(oxypropylene)amines (D400 and D2000) were purchased from Nanjing Huntsman Chemical Co., Ltd (Nanjing, China), with an average molecular weight of 403 g mol…”

“…Multiscale surface modification of CFs by adding poly(oxypropylene)aminemodified GO into the sizing system is a new perspective to improve the interfacial properties of composites. [30] In this article, GO is introduced on the surface of CFs through a sizing system to form a multiscale reinforcement, which results in the multiscale surface modification of CFs to improve the interfacial and other properties of the composites. To further investigate the effect of interface structure on the properties of EP, two different molecular weights of difunctional poly(oxypropylene)amines, D400 and D2000, were selected to modify GO surface.…”

Efficient reinforcement of epoxy resin with amine‐rich rigid short‐chain grafted graphene oxide

“…It can be preliminarily determined that the modified small-molecule reagent was successfully introduced on the surface of GO. The grafting densities of DHN-GO was one amino group per 22.4 carbon atoms, which was calculated using the following equation [32] :…”

Production and Characterization of Nanocomposites With Graphene and Graphene Oxide

“…The effect of polystyrene GO on thermal stability of reinforced nanocomposite was studied by Rostampour et al (2016). The microstructure and mechanical properties of the nanocomposites produced by GO addition into the polymer were investigated by Zhang et al (2020). The GO was used as a coating material by Wang et al (2017) who also studied the effect of GO as a coating material on crack formation.…”