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Park, J. Y.,Umashankar, M.,Huh, D. S. THE POLYMER SOCIETY OF KOREA 2016 Macromolecular Research Vol.24 No.4
<P>A photoresponsive poly(methylmethacrylate/azobenzene) copolymer was synthesized through the copolymerization of methylmethacrylate (MMA) with 6-[4-(4-dimethylaminophenylazo)phenoxy]-hexyl methacrylate (Azo-monomer) to see the effect of UV illumination on the formation of honeycomb-patterned films fabricated by casting the copolymer solution under humid conditions. The synthesized copolymer was characterized by Fourier transform infrared, UV-vis, and nuclear magnetic resonance spectroscopy. The honeycomb-patterned films obtained by UV illumination showed more highly ordered films. It is due to a photo-switched isomerization of the azobenzene component in the PMMA-Azo copolymer from trans- to cis-isomer, which induces the amphiphilicity of the copolymer solution by increased dipole moment.</P>
Kim, J.K.,Basavaraja, C.,Umashankar, M.,Huh, D.S. IPC Science and Technology Press 2016 Polymer Vol.87 No.-
Novel biocompatible poly(@?-caprolactone) (PCL) was synthesized via in situ ring-opening polymerization of @?-caprolactone under different concentrations (10, 20, and 30 wt%) of capped magnetic nanoparticles (CMPs). The prepared PCL/CMP composites were characterized using Fourier transform infrared, UV-vis spectra, and X-ray photoelectron spectroscopy to demonstrate the interaction between PCL and CMP. X-ray diffraction patterns, scanning electron microscopy with energy dispersive X-ray spectroscopy, and thermogravimetric analysis were used to understand the structural nature and thermal stability of the polymer composites. Honeycomb-patterned thin films were fabricated by casting the composite solutions under humid conditions. The I-V characteristics and magnetic behavior of the honeycomb-patterned films were observed and compared with those of the flat thin composite films. The honeycomb-patterned PCL/CMP composite films revealed higher conductivity than the flat films and showed a hysteresis loop in the magnetization plotted against the applied magnetic field for magnetic behavior.