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Preparation, morphological and thermal characterization of novel nanocomposites based on poly (amide-ester-imide) containing amino acid and nano-Mg-doped fluorapatite surface modified with biodegradable diacid N-trimellitylimido-L-leucine


In this investigation, we prepared novel nanocomposites (NC) s based on poly (amide-ester-imide) (PAEI) containing L-leucine moiety and surface modified nano-Mg-doped fluorapatite (Mod-MgFA) with biodegradable diacid, via ultrasound irradiation. First, surface of nanocystalline Mg-doped fluorapatite was functionalized with biodegradable optically active diacid N-trimellitylimido-L-leucine (TML) by ultrasonic irradiation, so as to increase the compatibility and dispersity in the PAEI matrix. After modification via diacid TML, the Mg-doped fluorapatite was altered from a hydrophilic state to an organophilic one. At that time, the obtained functionalized Mod-MgFA was investigated as reinforcing agent for the synthesis of the PAEI NCs. The resulting NCs were characterized by Fourier transform infrared (FT-IR), transmission electron microscopy, field emission-scanning electron microscopy (FE-SEM), X-ray diffraction, and thermogravimetric analysis (TGA) techniques. TGA data showed an increasing in thermal stability of the aforementioned NCs when compared to the neat PAEI. FE-SEM results presented a rather good amount of dispersion of Mod-MgFA in the polymer matrix.

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