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Microstructure and Electrical Properties of Poly-N-isopropylacrylamide- N-vinylcarbazole Copolymers
R. Pierson,바사바,Na Ri Kim,Eun Ae Jo,허도성 대한화학회 2009 Bulletin of the Korean Chemical Society Vol.30 No.9
Conducting poly-N-isopropylacrylamide-N-vinyl carbazole (PNI-nvc) copolymers were synthesized via in situ deposition technique by dissolving different weight percentages of N-vinyl carbazole (10, 20, 30, and 40%). The structural morphology and FT-IR studies support the interaction between PNI and N-vinyl carbazole. The temperaturedependent DC conductivity of PNI-nvc was studied within the range of 300 ≤ T ≤ 500 K, presenting evidence for the transport properties of PNI-nvc. The DC conductivity of PNI-nvc copolymers signifies the future development of new nanocopolymers that acts as a multifunctional material.
Microstructure and Electrical Properties of Poly-N-isopropylacrylamide- N-vinylcarbazole Copolymers
Pierson, R.,Basavaraja, C.,Kim, Na-Ri,Jo, Eun-Ae,Huh, Do-Sung Korean Chemical Society 2009 Bulletin of the Korean Chemical Society Vol.30 No.9
Conducting poly-N-isopropylacrylamide-N-vinyl carbazole (PNI-nvc) copolymers were synthesized via in situ deposition technique by dissolving different weight percentages of N-vinyl carbazole (10, 20, 30, and 40%). The structural morphology and FT-IR studies support the interaction between PNI and N-vinyl carbazole. The temperaturedependent DC conductivity of PNI-nvc was studied within the range of 300 ${\leq}\;T\;{\leq}$ 500 K, presenting evidence for the transport properties of PNI-nvc. The DC conductivity of PNI-nvc copolymers signifies the future development of new nanocopolymers that acts as a multifunctional material.
Basavaraja, C.,Pierson, R.,Huh, Do Sung Wiley Subscription Services, Inc., A Wiley Company 2008 Journal of applied polymer science Vol.108 No.2
<P>To study the effect of a surfactant on the properties of polyaniline (PANI)/metal oxide composites, PANI/lead titanate (PbTiO<SUB>3</SUB>) composites were synthesized with different weight percentages (10, 20, 30, 40, and 50 wt %) of PbTiO<SUB>3</SUB> in both the absence and presence of dodecylbenzenesulfonic acid (DBSA) by the polymerization of aniline with ammonium persulfate as an initiator. The structural characteristics and stability, surface characteristics, and electric properties of PANI/PbTiO<SUB>3</SUB> and PANI–DBSA/PbTiO<SUB>3</SUB> were studied and compared. The interfacial interactions and thermal stability of these composites were characterized with X-ray diffraction, scanning electron microscopy, transmission electron microscopy, and thermogravimetry techniques. The results indicate significant changes in the physicochemical properties of the composites with the incorporation of DBSA. © 2008 Wiley Periodicals, Inc. J Appl Polym Sci, 2008</P>
Nonlinear Entropy Production in a Reversible Oregonator Model
바사바,허도성,R. Pierson,Seung Hyun Park,Eun Ji Jeon 대한화학회 2008 Bulletin of the Korean Chemical Society Vol.29 No.5
The entropy production in a non-equilibrium state based on the reversible Oregonator model of the Belousov-Zhabotinskii (BZ) reaction system has been studied. The reaction affinity and the reaction rate for the individual steps have been calculated by varying the concentrations of key variables in the system. The result shows a linear relationship between the reaction affinity and the reaction rate in the given concentration range. However, the overall entropy calculated on the basic assumption that the entropy in a reaction system corresponds to the summation of a product of reaction affinity and reaction rate of individual steps shows a nonlinearity of the reaction system. The results well agrees with the fact that the entropy production is not linear or complicated function in a non-linear reaction system.
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.
Nonlinear Entropy Production in a Reversible Oregonator Model
Basavaraja, C.,Pierson, R.,Park, Seung-Hyun,Jeon, Eun-Ji,Huh, Do-Sung Korean Chemical Society 2008 Bulletin of the Korean Chemical Society Vol.29 No.5
The entropy production in a non-equilibrium state based on the reversible Oregonator model of the Belousov-Zhabotinskii (BZ) reaction system has been studied. The reaction affinity and the reaction rate for the individual steps have been calculated by varying the concentrations of key variables in the system. The result shows a linear relationship between the reaction affinity and the reaction rate in the given concentration range. However, the overall entropy calculated on the basic assumption that the entropy in a reaction system corresponds to the summation of a product of reaction affinity and reaction rate of individual steps shows a nonlinearity of the reaction system. The results well agrees with the fact that the entropy production is not linear or complicated function in a non-linear reaction system.