Premium
New generation of thermally stable and conducting poly(azomethine‐ester)s: nano‐blend formation with polyaniline
Author(s) -
Kausar Ayesha,
Hussain Syed Tajammul
Publication year - 2013
Publication title -
polymer international
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.592
H-Index - 105
eISSN - 1097-0126
pISSN - 0959-8103
DOI - 10.1002/pi.4438
Subject(s) - polyaniline , materials science , thermal stability , thiophene , glass transition , polymer chemistry , chemical engineering , polyaniline nanofibers , interfacial polymerization , fourier transform infrared spectroscopy , conductive polymer , polymer , monomer , polymerization , composite material , organic chemistry , chemistry , engineering
A new dihydroxy monomer, ( E )‐1‐(4‐(4‐(4‐hydroxybenzylidene)thiocarbamoylaminobenzyl)phenyl)‐3‐(4‐hydroxybenzylidene)thiourea, was synthesized and polymerized with thiophene‐2,5‐dicarbonyl/terephthaloyl chloride. The structural characterization of the resulting polymers was carried out using spectral techniques (Fourier transform infrared and 1 H NMR ) along with a physical property investigation. Novel polyesters are readily soluble in various amide solvents and possess high molar mass of 112 × 10 3 –133 × 10 3 g mol −1 . The thermal stability was determined via 10% weight loss to be in the range 519–523 °C and the glass transition temperature was 286–289 °C. Electrically conducting poly(azomethine‐ester)‐ blend ‐polyaniline blends were prepared using mash‐blending and melt‐blending techniques. Materials obtained using the conventional melt‐blending approach generated an efficient conductive network compared with those produced by mash blending. Field emission scanning electron microscopy revealed a nano‐blend morphology for the melt‐blended system owing to increased physical interactions (hydrogen bonding and π–π stacking) between the two constituent polymers. Miscible blends of thiophene‐based poly(azomethine‐ester)‐ blend ‐polyaniline had superior conductivity (1.6–2.5 S cm −1 ) and thermal stability ( T 10 = 507 °C) even at low polyaniline concentration relative to reported thiophene/azomethine/polyaniline‐based structures. The new thermally stable and conducting nano‐blends could be candidates for various applications including optoelectronic devices. © 2012 Society of Chemical Industry