Reduced Graphene Oxide–Epoxy Grafted Poly(Styrene-Co-Acrylate) Composites for Corrosion Protection of Mild Steel

Zhang

et al. 2022

ACS Appl. Nano Mater.

On the basis of their size effect and structural characteristics, carbon nanomaterials have great application potential in building materials, especially for strengthening and toughening cement-based materials. However, because of the poor dispersant of graphene oxide (GO) in cement-based materials with high-alkalinity and high-calcium content, its application in cement concrete is facing great challenges. Here, a method of self-assembling GO by phenyl polymer to achieve effective dispersion is reported. The good dispersion stability is due to hybridization between the phenyl group of the polymer and GO through noncovalent interactions, so the polymer can be anchored to the surface of the GO sheet and dispersed by steric hindrance of the side chain of poly(ethylene oxide) (PEO). The results show that when the length of the PEO side chain is constant, the phenyl content in the copolymer may not only affect the π−πstacking interaction (from offset face-to-face to edge-to-face) but also significantly affect the dispersion stability of the system. When the molar ratio of phenyl to the PEO side chain is about 2, it shows good dispersibility (i.e., the size of the self-assembled composite is the smallest). This provides reference and enlightenment for regulation of the dispersion stability of GO under severe environmental conditions.

Section: Resultssupporting

confidence: 56%

“…This phenomenon has been reported in some papers. 59,60 It is considered that the phenyl groups might orderly arrange on GO layers to increase the intensity of the G band. Meanwhile, when the phenyl groups content in the copolymer increases further, the disorder degree increases.…”

Section: ■ Results and Discussionmentioning

confidence: 99%

Stability of Phenyl Copolymer–Graphene Oxide Composites in High-Alkali and/or -Calcium Environments: Implications for Strengthening and Toughening Cement-Based Materials

Zhang

et al. 2022

ACS Appl. Nano Mater.

“…In Figure 11(d3), the worn surface under action of the PEEK/nano-capsule composite has a distinct peak shape of S element, which appears at 161.2 eV and 168.3 eV, respectively. The two peeks may be attributed to the sulfur species in Fe-S and S-O, respectively [57][58][59], which is good evidence for the release of RC2540 lubricant during friction. In Figure 11(d1,d2), the peak shape of C on the worn surface under friction of the PEEK/nano-capsule composite is similar to that of the PEEK/CNT composite.…”

Section: Xps Analysis Of Worn Surface On Steel Discmentioning

confidence: 85%

Self-Lubricating Properties of Polyether-Ether-Ketone Composites Filled with CNTs@RC2540 Nano-Capsules

Guan,

Xu,

Zheng

et al. 2023

Lubricants

Polyether-ether-ketone (PEEK) exhibits great potential in being a replacement for metal components across various applications relying on the mechanical and tribological properties. However, there is still much to be done to improve its properties. The main motivation of this paper is to improve the tribological and mechanical properties of PEEK simultaneously for more severe working environment. Therefore, dialkyl pentasulfide (RC2540) was proposed to fill into the cavity of CNTs to prepare nano-capsules, which were then filled into PEEK to prepare PEEK/nano-capsules composites. The existence of nano-capsules in PEEK was analyzed, and the friction and wear properties exhibited by PEEK composites against GCr15 steel were examined using pin-disk friction pairs, and the self-lubricating mechanism of PEEK composites in friction was revealed. Findings of this study indicated that when the mass fraction of nano-capsules was less than 5%, the filling of nano-capsules could improve the tensile strength of PEEK and reduced the friction coefficient and specific wear rate of PEEK by filling nano-capsules. During the friction process, RC2540 in the nano-capsules can be released as PEEK wears so that a self-lubricating layer can be formed for reducing PEEK composites’ friction and wear.

J of Applied Polymer Sci

“…In our group, poly(styrene‐alt‐maleic anhydride) modified rGO nanosheet via π‐π conjugation has been verified to be an effective method to enhance the uniform dispersion in epoxy matrix 19,20 . In this research, poly(styrene‐alt‐maleic anhydride) ionic salt was prepared to functionalize rGO nanosheet together with rare earth ions doping method.…”

Section: Introductionmentioning

confidence: 99%

Poly(styrene‐alt‐maleic anhydride) ionic salt functionalized reduced graphene oxide doped with rare earth ions for anti‐corrosion performance enhancement

Zhan

et al. 2021

Self Cite

A novel organic–inorganic nanocomposite material of rare earth ions/ poly(styrene‐alt‐maleic anhydride) ionic salt/ reduced graphene oxide (Re3+/SMA‐Is/rGO) was prepared successfully. Poly(styrene‐alt‐maleic anhydride) ionic salt functionalized reduced graphene oxide (SMA‐Is/rGO) was processed with two methods of π–π conjugation and ionization; rare earth ions (Re3+ = La3+, Ce3+ Pr3+) was doped on the surface of rGO by physical mixing. SMA‐Is reduced surface energy and enlarged the interlayer spacing between rGO nanosheets, ensuring that Re3+/SMA‐Is/rGO could form a uniform dispersed phase in the organic coating. The anti‐corrosion performance of the nanocomposite coating was measured by electrochemical techniques in corrosive medium, revealing that introducing the nanocomposite to epoxy matrix exhibited a significant decline of the increase of corrosion potential and corrosion current density. In all samples, La3+/SMA‐Is/rGO had the highest anti‐corrosion performance, and the protection efficiency on mild steel was up to 98.97%.