Graphene oxide as flexibilizer for epoxy amine resins

Wolk, Andreas; Rosenthal, Marta; Weiß, Julia; Voigt, Markus; Wesendahl, Jan-Niklas; Hartmann, Marc; Grundmeier, Guido; Wilhelm, René; Meschut, Gerson; Tiemann, Michael; Bremser, Wolfgang

doi:10.1016/j.porgcoat.2018.05.028

Cited by 30 publications

(9 citation statements)

References 28 publications

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“…Some studies state that polyurea has an ideal morphology for mechanical properties [ 42 ]. Mott and et al pointed out in their study that the response of polyurea to mechanical perturbation is strongly rate-dependent and associated with substantial energy loss [ 43 ].…”

Section: Resultsmentioning

confidence: 99%

Layered Clay–Graphene Oxide Nanohybrids for the Reinforcement and Fire-Retardant Properties of Polyurea Matrix

et al. 2021

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Nanostructures are more and more evolved through extensive research on their functionalities; thus, the aim of this study was to obtain layered clay–graphene oxide nanohybrids with application as reinforcing agents in polyurea nanocomposites with enhanced thermal–mechanical and fire-retardant properties. Montmorillonite (MMT) was combined with graphene oxide (GO) and amine functionalized graphene oxide (GOD) through a new cation exchange method; the complex nanostructures were analyzed through FTIR and XPS to assess ionic interactions between clay layers and GO sheets by C1s deconvolution and specific C sp3, respective/ly, C-O secondary peaks appearance. The thermal decomposition of nanohybrids showed a great influence of MMT layers in TGA, while the XRD patterns highlighted mutual MMT and GO sheets crystalline-structure disruption by the d (002) shift 2θ = 6.29° to lower values. Furthermore, the nanohybrids were embedded in the polyurea matrix, and the thermo-mechanical analysis gave information about the stiffness of MMT–GO nanocomposites, while GOD insertion within the MMT layers resulted in a 30 °C improvement in the Tg of hard domains, as shown in the DSC study. The micro CT analysis show good dispersion of inorganic structures within the polyurea, while the SEM fracture images revealed smooth surfaces. Cone calorimetry was used to evaluate fire-retardant properties through limiting the oxygen index, and MMT–GOD based nanocomposites showed a 35.4% value.

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Section: Resultsmentioning

confidence: 99%

Layered Clay–Graphene Oxide Nanohybrids for the Reinforcement and Fire-Retardant Properties of Polyurea Matrix

et al. 2021

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“…These fillers are often used because they are able to influence many physical and mechanical properties due to their structure and various surface modifications. Frequently investigated fillers are titanium dioxide [28], graphene oxide [29,30], carbon nanotubes [31,32], nanoclay [33], carbon fibres [34], etc. or even combinations thereof.…”

Section: Definition Of Materialsmentioning

confidence: 99%

Simplified Testing of the Bond Strength of Adhesives Used for Bonded Anchors

et al. 2021

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The analysis presented in this paper is focused on problems of bond strength as an overall bond quality parameter of industrial adhesives for structural anchoring. In the first part, the problem of bond strength as the most important parameter influencing the final anchor resistance to tension load is described. Further in the text, a new methodology of simplified testing of the strength parameters of adhesives is described. Special test specimens made from steel are repeatedly used in this methodology. Additionally, results of these tests on some new recipes for adhesive are presented. Especially, epoxy resins with special fillers, such as carbon fibres, carbon nanotubes or graphene, were tested. The use of these adhesives in temperatures close to zero degrees Celsius was also tested.

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“…[7][8][9][10][11][12][13][14][15][16][17][18] The functionalization of graphene and its derivatives plays a crucial role to modulate their properties and fabricate graphene-based conjugates with new characteristics and applications. [18][19][20][21][22][23][24][25] Graphene can be covalently or non-covalently functionalized. In the rst case, strong and stable covalent bonds are formed, but in the second one, there is the formation of weak bonds like hydrogen bonds, p-p interactions and van der Waals interactions.…”

Section: Introductionmentioning

confidence: 99%

“…Yet, maleic anhydride is moisture sensitive and the retro-Diels-Alder reaction needs with this dienophile reasonable high temperatures. Due to our interest in the application of functionalized graphene derivatives 6,[23][24][25] and considering that furan-derivatives are undergoing retro-Diels-Alder under the mildest conditions, 41 we were interested to combine the functionalization of graphite with ball milling and furan as diene in order to obtain furan-derivative functionalized graphene. For this purpose, we report here a solvent-free mechanochemical method driven by ball milling.…”

Section: Introductionmentioning

confidence: 99%