Effect of Nano Silica on Moisture Absorption of Polyurethane Clear Coats as Studied by EIS and Gravimetric Methods

سال انتشار: 1388
نوع سند: مقاله کنفرانسی
زبان: انگلیسی
مشاهده: 2,078

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شناسه ملی سند علمی:

ICCC03_070

تاریخ نمایه سازی: 6 اردیبهشت 1388

چکیده مقاله:

Electrochemical impedance spectroscopy (EIS) and gravimetric methods were carried out to analyze water uptake of thin polyurethane films separately filled with hydrophobic or hydrophilic nano-silica. A gravimetric test method was performed using a simulated ASTM D570 standard technique. Correspondingly the impedance spectra and gravimetric data were interpreted in terms of movement of water within the coating and/or to the coating/metal interface. Type and content of nano silica had significant effects on the capability of water absorption of thin filled coatings. Indeed, it was found that rate and maximum level of moisture absorption of polyurethane coatings heavily depended on the type and loads of nano-silica within the clear coat

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نویسندگان

S Moradian

Department of Polymer and Color Engineering, Amirkabir University of Technology