Preparation and characterization of electrically conductive multiwalled carbon nanotube/polyoxazoline nanocomposite films using spray coating

• Published in: JCT research Vol. 16; no. 6; pp. 1757 - 1764
• Main Authors: Oytun, Faruk, Ozkose, Umut Ugur
• Format: Journal Article
• Language: English
• Published: New York Springer US 01.11.2019; Springer Nature B.V
• Subjects: Ammonia; Carboxylic acids; Cationic polymerization; Chemistry and Materials Science; Corrosion and Coatings; Differential scanning calorimetry; Electrical properties; Electrical resistivity; Emission analysis; Field emission microscopy; Fourier transforms; Glass substrates; Industrial Chemistry/Chemical Engineering; Infrared analysis; Liquid chromatography; Materials Science; Morphology; Multi wall carbon nanotubes; Nanocomposites; NMR; Nuclear magnetic resonance; Polymer Sciences; Polyoxazolines; Ring opening polymerization; Spray coating; Surfaces and Interfaces; Thermal stability; Thermogravimetric analysis; Thin Films; Tribology; Multiwalled carbon nanotubes; Polyoxazolines; Spray coating; Polymer nanocomposites; Thin film
• ISSN: 1547-0091; 1935-3804; 2168-8028
• DOI: 10.1007/s11998-019-00239-w

Multiwalled carbon nanotube/poly(2-ethyl-2-oxazoline) (MWCNT/PEtO x ) nanocomposites with different MWCNT content were successfully prepared by amidation reaction between amine-terminated PEtO x (PEtO x –NH 2 ) and carboxylic acid-functionalized MWCNTs (MWCNT–COOH). First, the living cationic ring-opening polymerization of 2-ethyl-2-oxazoline was initiated by methyl p-toluenesulfonate and terminated with ammonia to obtain PEtO x –NH 2 . Then, amidation reaction between amino groups of PEtO x –NH 2 and carboxylic acid groups of MWCNT–COOH was carried out to obtain MWCNT/PEtO x nanocomposites. Finally, nanocomposite films were deposited by spray coating on glass substrates. The structural, thermal, morphological, and electrical properties of the nanocomposites and their films were investigated in detail by gel permeation chromatography, nuclear magnetic resonance, Fourier transform infrared spectroscopy, differential scanning calorimetry, thermogravimetric analysis, field emission scanning electron microscopy, and two-point probe digital multimeter. All nanocomposites showed higher thermal stability than neat polymer, whereas the spray-coated nanocomposite films exhibited well-dispersed morphology and enhanced electrical conductivity with increase in MWCNT content.