engleski

Polymer nano-coatings crosslinked by γ-rays

Crosslinking of a well-ordered layer of self- assembled molecules (SAMs) on the surface of copper additionally enhances SAMs protective properties by improving their functional properties as well as reducing penetration of external molecules into the coatings [1]. Thus, the obtained polymer nanocoating (PNC) has significantly higher stability and better protective properties while retaining SAMs numerous advantages. In this work elaidic acid (EA), a non-toxic unsaturated fatty acid (FA) was used as the self-assembling molecule, while crosslinking was initiated by ionizing irradiation. By using irradiation toxic agents that are used for classical crosslinking can be avoided, while on the other hand the process is homogeneous, fast and simple to perform. Since FAs are environment friendly molecules and crosslinking is performed without toxic agents the process can be considered as a Green Technology [2]. The aim of this work was to reduce the irradiation dose needed for successful crosslinking of a SAM of EA on copper by changing the irradiation media from air to water. Namely, previous research has shown that EA SAMs can be successfully crosslinked in air with 110 kGy. Reducing the applied irradiation dose would reduce the treatment price. This work has shown that when irradiated in water doses can be reduced to 40 kGy, but the polymer coatings obtained by crosslinking in air have somewhat better properties. The obtained coatings properties were investigated by contact angle measurements and FTIR Spectroscopy, while their behavior in atmospheric conditions was studied by electrochemical methods (Tafel extrapolation method and electrochemical impedance spectroscopy). ACKNOWLEDGEMENTS: We thank the Croatian Science Foundation (HRZZ IP-2020-02-4344) for supporting the research. REFERENCES [1] A. Pathania, J. Sharma, R. K. Arya, S. Ahuja. Prog. Org. Coat. 2018, 114, 78. [3] Woods, R.J. & Pikaev, A.L. Applied Radiation Chemistry: Radiation Processing (John Wiley & Sons, Inc., 1994).

polymer nanocoatings ; gamma radiation ; SAM ; electrochemical methods ; copper ; elaidic acid

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