Studying the role of polysiloxane additives and nano-SiO2 on the mechanical properties of a typical acrylic/melamine clearcoat |
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| Authors: | B. Ramezanzadeh S. Moradian N. Tahmasebi A. Khosravi |
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| Affiliation: | aAmirkabir University of Technology, Department of Polymer Engineering and Color Technology, P.O. Box 6526, Iran;bDepartment of Surface Coatings and Corrosion, Institute for Color Science and Technology, No. 59, Vafamanesh St., Hosainabad Sq., Lavizan, Tehran, Iran;cDepartment of Polymer Engineering, Mahshahr Branch, Islamic Azad University, Postal Code 63519, Mahshahr, Iran |
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| Abstract: | Effects of conventional polysiloxane additives and nano-SiO2 on the mechanical properties of an automotive acrylic/melamine clearcoat (CC) are studied. Clearcoats formulations were prepared by addition of different concentrations of polysioloxane additives (with different modifications) and hydrophobic nano-SiO2 particles. Attenuated Total Reflection-Fourier Transform Infrared (ATR-FTIR) and atomic force microscope (AFM) were utilized to evaluate the effects of nano-SiO2 and polysiloxane additives on the surface properties of the CCs. The mechanical properties of the surface and the bulk of the CCs were studied by nano-indentation and tensile tests, respectively. Results showed that polysiloxane additives can mostly affect the mechanical properties of the surface of the CC. Additives with shorter side chains and therefore higher surface activity caused higher changes on the surface properties the CC. Unlike conventional polysiloxane additives, the nano-SiO2 particles mainly influenced the mechanical properties of the bulk of the CC. |
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| Keywords: | Polysiloxan additives Nano-SiO2 Mechanical properties Nano-indentation ATR-FTIR |
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