Construction and characterization of poly(amide-ester-imide) nanocomposites containing N-trimellitylimido-l-leucine toughened with a combination of bioactive surface-grafted TiO2

• Published in: Progress in organic coatings Vol. 76; no. 11; pp. 1608 - 1615
• Main Authors: Mallakpour, Shadpour, Khani, Marziyeh
• Format: Journal Article
• Language: English
• Published: Elsevier B.V 01.11.2013
• Subjects: Bioactive diacid as coupling agent; Construction; Coupling agents; Iron; Monomers; Poly(amide-ester-imide); Polymer nanocomposites; Scanning electron microscopy; Spectroscopy; TiO2 nanoparticles; Titanium dioxide; Transmission electron microscopy; Ultrasonic irradiation; Poly(amide-ester-imide); Bioactive diacid as coupling agent; Ultrasonic irradiation; TiO2 nanoparticles; Polymer nanocomposites
• ISSN: 0300-9440; 1873-331X
• DOI: 10.1016/j.porgcoat.2013.07.012

•Surface modification of TiO2 with chiral diacid monomer as a coupling agent.•Synthesis of a novel chiral PAEI by step-growth polymerization.•Preparation of polymer-based NCs via incorporation of modified TiO2 into the PAEI.•The TEM and SEM results designated that the NPs were dispersed homogeneously. This paper addressed production and characterization of novel type copolyester/titania (TiO2) nanocomposites (NCs). First, the surface of TiO2 was modified by chiral diacid monomer, N-trimellitylimido-l-leucine (TMIL) (1) as a coupling agent to form organomodified TiO2 (O-TiO2) nanoparticles (NPs). Fourier transform infrared (FT-IR) spectroscopy confirmed the presence of coupling agent groups on the surface. Thereafter, a novel chiral poly(amide-ester-imide) (PAEI) was synthesized by step-growth polymerization of diacid monomer 1 with diol, N,N′-(1,3,5,7-tetraoxo-5,7-dihydropyrrolo[3,4-f]isoindole-2,6(1H,3H)-diyl)bis(4-hydroxybenzamide) (2) via tosyl chloride, pyridine and N,N-dimethyformamide as a condensing agent. The incorporation of O-TiO2 NPs into the obtained PAEI provided an opportunity for the construction of polymer-based NCs with novel and powerful properties. The obtained NCs were premeditated using transmission electron microscopy (TEM), FT-IR spectra, thermogravimetric analysis (TGA), field emission scanning electron microscopy (FE-SEM), X-ray diffraction; also the optical properties of the NCs were studied using ultraviolet-visible spectroscopy. The TEM and FE-SEM results showed that the NPs were dispersed homogeneously in PAEI matrix on the nanoscale. TGA data confirmed that the heat stability of the aforementioned NCs in the presence of O-TiO2 NPs was improved.