Disulfide bonds modified epoxy resins: mechanical, adhesion and wear properties
DOI:
https://doi.org/10.62638/ZasMat1237Abstract
Epoxy occupies an important place in many engineering applications, so it is necessary to improve its properties such as adhesion strength, wear resistance, and toughness. In this study epoxy was modified by incorporation of disulfide bonds. A coating layer was prepared by adding ethanol disulfide to epoxy resin at various weight percent: 0.5, 1.5, 2.5 and 3.5 wt.%. Fourier-transform infrared spectroscopy was employed to investigate any chemical interaction. Differential scanning colometry (DSC) analysis provides valuable information about thermal behaviour of the prepared epoxy coating. Tensile, hardness, impact, fracture toughness and adhesion properties were tested. Wear behaviour was investigated by pin-on-disc device. Results show that epoxy containing disulfide bonds (EP+SS) offering excellent impact resistance with good fracture toughness compared to neat epoxy. Additionally, contact angle test results show an enhancement of wettability between the modified epoxy coating layer and steel substrate. Adhesion strength of epoxy layer enhanced by incorporating ethanol disulfide into epoxy resin reaching a superior value. Comparison to neat epoxy, the coefficient of friction of (EP+SS) highly decreased reaching about 89% and wear rate decreased by 76% as the percentage of the added ethanol disulphide increases.
In conclusion, a tough superior adhesive epoxy coating layer was synthesised by incorporation of the ethanol disulfide compound into epoxy resin.
Keywords:
disulfide, epoxy, wear, adhesion, dynamic bonds.References
A. A. Naser and B. M. Fahad, “Adhesion test for epoxy reinforcing using waste materials applied on concrete surfaces,” IOP Conf. Ser. Mater. Sci. Eng., vol. 433, no. 1, 2018, doi: 10.1088/1757-899X/433/1/012004.
S. Saadatmandi, M. Asghari, and B. Ramezanzadeh, “Effective epoxy composite coating mechanical/fracture toughness properties improvement by incorporation of graphene oxide nano-platforms reduced by a green/biocompataible reductant,” J. Ind. Eng. Chem., vol. 75, pp. 271–284, 2019, doi: 10.1016/j.jiec.2019.03.038.
T. Prasad, S. Halder, S. S. Dhar, and M. S. Goyat, “Epoxy/imidazole functionalized silica epoxy nanocomposites: Mechanical and fracture behaviour,” Express Polym. Lett., vol. 15, no. 3, pp. 203–223, 2021, doi: 10.3144/expresspolymlett.2021.19.
A. Abdelhussien, G. Yang, E. K. Hussein, L. Li, H. Al-Abboodi, and B. Mohamad, “ANALYSIS OF THE MECHANICAL CHARACTERISTICS OF DATE SEED POWDER-BASED COMPOSITE CARBON FIBER REINFORCED POLYMERS,” Facta Univ. Ser. Mech. Eng., 2023.
B. Krishnakumar et al., “Disulfide exchange assisted self-healing epoxy/PDMS/graphene oxide nanocomposites,” Nanoscale Adv., vol. 2, no. 7, pp. 2726–2730, 2020, doi: 10.1039/d0na00282h.
F. Yeasmin et al., “Remarkable enhancement of thermal stability of epoxy resin through the incorporation of mesoporous silica micro-filler,” Heliyon, vol. 7, no. 1, p. e05959, 2021, doi: 10.1016/j.heliyon.2021.e05959.
M. Nawaz, N. Naeem, R. Kahraman, M. F. Montemor, W. Haider, and R. A. Shakoor, “Effectiveness of epoxy coating modified with yttrium oxide loaded with imidazole on the corrosion protection of steel,” Nanomaterials, vol. 11, no. 9, pp. 1–16, 2021, doi: 10.3390/nano11092291.
D. Martinez-Diaz, A. Cortés, A. Jiménez-Suárez, and S. G. Prolongo, “Hardener Isomerism and Content of Dynamic Disulfide Bond Effect on Chemical Recycling of Epoxy Networks,” ACS Appl. Polym. Mater., vol. 4, no. 7, pp. 5068–5076, 2022, doi: 10.1021/acsapm.2c00598.
K. Dutta and N. Karak, “Exchangeable disulfide bond containing highly flexible epoxy vitrimers with shape‐memory, self‐healing, and UV shielding attributes,” Polym. Adv. Technol., vol. 35, no. 1, p. e6286, 2024.
X. Zhang, H. Lin, Y. Hu, D. Ding, F. Cai, and Y. Wu, “Electric tree intrinsic self-healing epoxy insulating materials based on disulfide bond,” Polym. Degrad. Stab., vol. 218, p. 110567, 2023.
Z.-J. Li et al., “Investigation on self-healing property of epoxy resins based on disulfide dynamic links,” Chinese J. Polym. Sci., vol. 38, pp. 932–940, 2020.
H. Y. Tsai, Y. Nakamura, T. Fujita, and M. Naito, “Strengthening epoxy adhesives at elevated temperatures based on dynamic disulfide bonds,” Mater. Adv., vol. 1, no. 9, pp. 3182–3188, 2020, doi: 10.1039/d0ma00714e.
A. Ruiz De Luzuriaga et al., “Epoxy resin with exchangeable disulfide crosslinks to obtain reprocessable, repairable and recyclable fiber-reinforced thermoset composites,” Mater. Horizons, vol. 3, no. 3, pp. 241–247, 2016, doi: 10.1039/c6mh00029k.
M. L. Henriksen, J. B. Ravnsbæk, M. Bjerring, T. Vosegaard, K. Daasbjerg, and M. Hinge, “Epoxy Matrices Modified by Green Additives for Recyclable Materials,” ChemSusChem, vol. 10, no. 14, pp. 2936–2944, 2017, doi: 10.1002/cssc.201700712.
S. K. Burhan, “INVESTIGATION OF MECHANICAL AND THERMAL BEHAVIOR OF COMPOSITE MATERIAL FILLED RICE HUSK ASH,” Iraqi J. Mech. Mater. Eng., vol. 17, no. 4, 2017.
Z. A. R. A. H. Al Saadi, Z. K. Alobad, and M. A. Akraa, “Effect of Modification With Polyether Polyol and Liquid Silicon Rubber on the Mechanical Properties of Epoxy System,” Kufa J. Eng., vol. 15, no. 3, pp. 170–185, 2024, doi: 10.30572/2018/KJE/150310.
A. Q. Saeed and Z. K. M. Al-Obad, “Investigates the Effect of MgO, h-BN, and Hybrid Nano Fillers on the Thermal, Electrical Properties and Hardness of an Epoxy Polymer,” AIP Conf. Proc., vol. 2830, no. 1, 2023, doi: 10.1063/5.0157171.
S. K. Burhan, M. M. Abed, and M. A. Salih, “Rice Husk Ash as a nano-filler to synthesize thermosetting polymer nanocomposites and evaluation of its tribological behavior”.
B. Wang et al., “Preparation of Epoxy Resin with Disulfide-Containing Curing Agent and Its Application in Self-Healing Coating,” Materials (Basel)., vol. 16, no. 12, 2023, doi: 10.3390/ma16124440.
Z. J. Li et al., “Investigation on Self-healing Property of Epoxy Resins Based on Disulfide Dynamic Links,” Chinese J. Polym. Sci. (English Ed., vol. 38, no. 9, pp. 932–940, 2020, doi: 10.1007/s10118-020-2406-x.
S. G. Croll, C. Siripirom, and B. D. Keil, “Pull-off adhesion test for coatings on large pipes: Possible variations in failure location and mode,” Pipelines 2014 From Undergr. to Forefr. Innov. Sustain. - Proc. Pipelines 2014 Conf., pp. 1319–1333, 2014, doi: 10.1061/9780784413692.118.
