Cryogenic fracture behavior of epoxy reinforced by a novel graphene oxide/poly(p-phenylenediamine) hybrid

Hussein, Abdelrahman; Sarkar, Sourav; Lee, Kwangju; Kim, Byungki

doi:10.1016/j.compositesb.2017.07.085

Cited by 47 publications

(15 citation statements)

References 57 publications

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“…Furthermore, a new peak at 1173 cm −1 (C–N stretching vibration) appeared, indicating the formation of C–NH–C bands due to the chemical grafting of PPD onto GO surface via nucleophilic substitution reaction between the amine group of PPD and the epoxide group of GO [ 23 ]. This conclusion is also supported by the presence of new peaks at 819 and 1515 cm −1 which is attributed to the deformation and stretching of N–H in –C–NH 2 groups, respectively [ 28 ].…”

Section: Resultsmentioning

confidence: 87%

Improving Thermo-Oxidative Stability of Nitrile Rubber Composites by Functional Graphene Oxide

Zhong

Zhang

Zhao³

et al. 2018

Materials

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Graphene oxide (GO), modified with anti-aging agent p-phenylenediamine (PPD), was added into nitrile rubber (NBR) in order to improve the thermo-oxidative stability of NBR. The modification of GO and the transformation of functional groups were characterized by Fourier transform infrared spectroscopy (FTIR), Raman, and X-ray diffraction (XRD). Mechanical performances of NBR composites before and after the thermo-oxidative aging were recorded. The results of dynamic mechanical analysis (DMA) show an increased storage modulus (G’) and a decreased value of area of tan δ peak after introducing modified GO into NBR. It indicates that filler particles show positive interaction with molecular chains. The thermo-oxidative stability of composites was investigated by thermogravimetric analysis (TG) and differential scanning calorimetry (DSC). Then, the thermo-oxidative aging kinetic parameters were obtained by the Flynn–Wall–Ozawa (FWO) equation. The results of aging tests show that the thermo-oxidative stability of rubber matrix increases obviously after introducing GO–PPD. In addition, mechanical properties (tensile strength and elongation at break) of both before and after aged NBR/GO–PPD composites were superior to that of NBR. This work provides meaningful guidance for achieving multifunction thermo-oxidative aging resistance rubber composites.

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Section: Resultsmentioning

confidence: 87%

Improving Thermo-Oxidative Stability of Nitrile Rubber Composites by Functional Graphene Oxide

Zhong

Zhang

Zhao³

et al. 2018

Materials

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“…Thus, the fracture surfaces of the graphene-modified EP are rougher than those of pure EP (Figure 5a,b). Hussein et al synthesized a hybrid filler based on graphene oxide/poly p-phenylenediamine (GO-PDA) [41]. At 153 K, the GO-PDA nanofiller could improve the strength, fracture strain, and toughness of EP when added at a low content.…”

Section: Graphenementioning

confidence: 99%

A Review of the Polymer for Cryogenic Application: Methods, Mechanisms and Perspectives

Chen

Yuan

et al. 2021

Polymers

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Recently, the application of polymer-based composites at cryogenic conditions has become a hot topic, especially in aerospace fields. At cryogenic temperature, the polymer becomes more brittle, and the adverse effect of thermal stress induced by temperature is more remarkable. In this paper, the research development of thermoset and thermoplastic polymers for cryogenic applications are all reviewed. This review considers the literature concerning: (a) the cryogenic performance of modified thermoset polymers and the improving mechanisms of the reported modification methods; (b) the cryogenic application potential of some commercial thermoplastic polymers and the cryogenic performance of modified thermoplastic polymers; (c) the recent advance in the use of polymer for special cryogenic environment-liquid oxygen. This paper provides a comprehensive overview of the research development of the polymer for cryogenic application. Moreover, future research directions have been proposed to facilitate its practical applications in aerospace.

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“…In addition, unlike the absence of the amine group in the N 1s spectra of PU, it is possible to observe for PU-AAc and all the coated PU stents additional peaks at 399.5 and 401.8 eV, respectively, attributed to amine groups. The peak observed for the PU-AAc sample (at 399.5 eV) can be assigned to the amino groups resulting from the degradation of amide linkages in the activation step [ 56 , 57 ]. By the coating process, a shift of this peak to 401.8 eV is observed that may be due to the existence of primary amine groups from units of ungrafted CS with FA derivatives in the coated PU stents [ 58 , 59 ].…”

Section: Resultsmentioning

confidence: 99%

Surface Functionalization of Ureteral Stents-Based Polyurethane: Engineering Antibacterial Coatings

et al. 2022

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Bacterial colonization of polyurethane (PU) ureteral stents usually leads to severe and challenging clinical complications. As such, there is an increasing demand for an effective response to this unmet medical challenge. In this study, we offer a strategy based on the functionalization of PU stents with chitosan-fatty acid (CS-FA) derivatives to prevent bacterial colonization. Three different fatty acids (FAs), namely stearic acid (SA), oleic acid (OA), and linoleic acid (LinA), were successfully grafted onto chitosan (CS) polymeric chains. Afterwards, CS-FA derivatives-based solutions were coated on the surface of PU stents. The biological performance of the modified PU stents was evaluated against the L929 cell line, confirming negligible cytotoxicity of the developed coating formulations. The antibacterial potential of coated PU stents was also evaluated against several microorganisms. The obtained data indicate that the base material already presents an adequate performance against Staphylococcus aureus, which slightly improved with the coating. However, the performance of the PU stents against Gram-negative bacteria was markedly increased with the surface functionalization approach herein used. As a result, this study reveals the potential use of CS-FA derivatives for surface functionalization of ureteral PU stents and allows for conjecture on its successful application in other biomedical devices.

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Cryogenic fracture behavior of epoxy reinforced by a novel graphene oxide/poly(p-phenylenediamine) hybrid

Cited by 47 publications

References 57 publications

Improving Thermo-Oxidative Stability of Nitrile Rubber Composites by Functional Graphene Oxide

Improving Thermo-Oxidative Stability of Nitrile Rubber Composites by Functional Graphene Oxide

A Review of the Polymer for Cryogenic Application: Methods, Mechanisms and Perspectives

Surface Functionalization of Ureteral Stents-Based Polyurethane: Engineering Antibacterial Coatings

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