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Basavaraja, C.,Pierson, R.,Huh, Do-Sung,Venkataraman, A.,Basavaraja, S. The Polymer Society of Korea 2009 Macromolecular Research Vol.17 No.8
Two types of nano composite were obtained by in situ chemical method in polyaniline (PANI)/dodecyl-benzenesulfonic acid (DBSA) system depending on the use of either ammonium persulfate (APS) or ferric chloride ($FeCl_3$) as the oxidant. In order to study the difference of the two composites in the surface characteristics, thermal stability, and electric properties, the composite films were studied by transmission electron microscopy (TEM), X-ray diffraction (XRD), thermogravimetric analysis (TGA), and temperature dependent DC electrical conductivity. The results revealed a large difference in the surface morphology, thermal stability, and the microstructure properties between the two composites, and these differences were considered responsible for the molecular order and conductivity.
Basavaraja, C.,Jo, Eun Ae,Kim, Bong Seong,Huh, Do Sung Wiley Subscription Services, Inc., A Wiley Company 2011 Polymer composites Vol.32 No.3
<P><B>Abstract</B></P><P>Cellulose triacetate (CTA) and multiwalled carbon nanotube (MWNT) composite films were prepared by dispersing different weight percentages of MWNTs into a CTA solution. These composite blends were characterized by UV–vis spectroscopy (UV), and their surface mophology, thermal stability, and amended crystallinity were determined by atomic force microscopy (AFM), thermogravimetric analysis (TGA), and X‐ray diffraction (XRD), respectively. Measurements of the complex impedance of the composite samples were made in the form of films. Sheets prepared from conventional techniques were used to study microwave absorption in the microwave range of 2–12 GHz, and the effects of sample thickness on microwave absorption were investigated. The experimental results show that the electrical conductivity of composites increases with the increase in MWNT loading without a percolation threshold. POLYM. COMPOS., 2011. © 2011 Society of Plastics Engineers</P>
Basavaraja, C.,Jo, Eun Ae,Huh, Do Sung Wiley Subscription Services, Inc., A Wiley Company 2011 Polymer composites Vol.32 No.1
<P><B>Abstract</B></P><P>Cellulose triacetate (CTA) was doped with poly(<I>N</I>‐vinylcarbazole) during the oxidative polymerization of <I>N</I>‐vinylcarbazole using ferric chloride as an initiator to form polymer blends. The blends were characterized by Fourier transform infrared and UV‐vis spectroscopy. The surface morphology was further studied using both scanning electron microscopy and transmission electron microscopy. Langmuir‐Schaefer films of the polymer blends were fabricated. The DC conductivity of the polymer films at room temperature was found to increase with an increase in CTA content up to a value of 0.001 S cm<SUP>−1</SUP>. The temperature‐dependent DC conductivity of the polymer films studied in the range of 300–500 K shows an increase in conductivity with an increase in temperature indicating a semiconducting behavior with a negative temperature coefficient of resistivity. The apparent activation energy also showed a pronounced effect with an increase in the temperature as well as an increase in the content of CTA. POLYM. COMPOS., 2011. © 2010 Society of Plastics Engineers</P>
Transport Properties of Polypyrrole Films Doped with Sulphonic Acids
Basavaraja, C.,Kim, Na-Ri,Jo, Eun-Ae,Pierson, R.,Huh, Do-Sung,Venkataraman, A. Korean Chemical Society 2009 Bulletin of the Korean Chemical Society Vol.30 No.11
The polymer blends containing polypyrrole (PPy) and the sulphonic acids such as β-naphthalene sulfonic acid (NSA), camphor sulfonic acid (CSA), and dodecylbenzenesulfonic acid (DBSA) were synthesized by in situ deposition technique in an aqueous media using ammonium per sulfate (APS) as an initiator. The obtained films were characterized by scanning electron microscopy (SEM), and the thermal behavior of these polymer blends was analyzed by thermogravimetric analysis (TGA) and differential scanning calorimetry (DSC). The temperature-dependent (DC) conductivity of the obtained films shows a semiconducting behavior with a negative temperature coefficient of resistivity (TCR). The conductivity data were also analyzed through Mott’s equation, which provides the variable range hopping model in three dimensions. The parameters such as density of states at the Fermi energy, hopping energy, and hopping distance were calculated for PPy, PPy-NSA, PPy-CSA, and PPy-DBSA films, and the data were compared.
Thermal and Electrochemical Properties of Polymannuronate-polyaniline Nanocomposites
Basavaraja, C.,Veeranagouda, Y.,Kim, Na-Ri,Jo, Eun-Ae,Lee, Kyoung,Huh, Do-Sung Korean Chemical Society 2009 Bulletin of the Korean Chemical Society Vol.30 No.5
New types of conducting polyaniline-polymannuronate (PANI-PM) composites were synthesized by in situ deposition techniques in an aqueous media. By dissolving different weight percentage of polymannuronate (PM) (5, 10, 15, and 25%), the oxidative polymerization of aniline was carried out using ammonium per sulfate as an oxidant. The obtained composites were studied for their thermal stability and electrochemical behavior. The thermal stability of PANI-PM composites is lower than PANI, which supports a strong interaction between PANI and PM. However, the composites show an appreciable electrochemical behavior. Based on these observation the PANI-PM composites can be explored in different fields such as electric devices, sensors, functional coatings, etc.
Basavaraja, Chitragara,Park, Do-Young,Choe, Young-Min,Park, Hyun-Tae,Zhao, Yan Shuang,Yamaguchi, Tomohiko,Huh, Do-Sung Korean Chemical Society 2007 Bulletin of the Korean Chemical Society Vol.28 No.5
Molecular recognition for a specific cation depending on the change of the oxidation state of the metal catalyst component contained in the hydrogel network has been studied in a self-oscillating hydrogel. The selfoscillating hydrogels are synthesized by the copolymerization of N-isopropylacrylamide (NIPAAm), lead methacrylic acid (Pb(MAA)2), and Ru(bpy)3 2+ monomer as a metal catalyst component. The recognition for a specific cation (in this study, Ca2+ has been used) is characterized by the adsorbed amount of Ca2+ into the gel. The recognition of the gels for Ca2+ is higher at the temperature below the LCST, and also higher at the oxidized state than at reduced state of the metal catalyst component which corresponds to a more swollen state. Moreover, a propagating wave induced by a periodic change of the oxidation state with the diffusion phenomena in the oscillating hydrogel shows a possibility for temporal and site-specific molecular recognition due to the local swelling of the gel.