期刊
PROGRESS IN ORGANIC COATINGS
卷 112, 期 -, 页码 162-168出版社
ELSEVIER SCIENCE SA
DOI: 10.1016/j.porgcoat.2017.07.012
关键词
Solvent based polyamide & minus; Imide; Cloisite 20A; Nanocomposite; Thermogravimetric analysis; Optical transparency; Contact angles
In this study, the morphology, optical transparency, thermal properties and contact angle of solvent based polyamide imide (SBP)/clay nanocomposites coatings were investigated. For this work, the nanocomposites (NC)s of SBP and different amounts of organoclay (Cloisite 20A) were prepared by solution intercalation technique. Finally, SBP/C20A NCs containing 1, 3 and 5 wt% of C20A were mixed via mechanical agitation and ultrasonic homogenizer and applied on cold-rolled steel (CRS) and glass substrates. The structures of exfoliation, intercalation, and aggregation feature were confirmed by wide-angle X-ray diffraction (WAXD), field emission scanning electron microscopy (FE-SEM) and energy dispersive X-ray map (EDS-mapping) analysis. The formation of SBP and NC was confirmed by attenuated total reflectance-Fourier transform infrared (ATR-FTIR) spectroscopy. The hydrophobicity, thermal stability and optical transparency of the coatings were also investigated using contact angle (CA) measurement with distilled water, thermogravimetric analysis (TGA) and UV-vis spectroscopy, respectively. Thermogravimetric analysis and hydrophobicity results showed that the addition of 1 and 3 wt% C20A into the SBP matrix increased the thermal decomposition temperatures and the CA of as-obtained nanocomposites compared to the pure SBP and NC5%. Furthermore, UV-vis spectroscopy and photograph results confirmed that the optical transparency of the NCs was reduced.
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