DC electrical conductivity of polydithiooxamide–metal complexes

El‐Shekeil, Ali; Khalid, Maarib A; Al-Maydama, Hussein M.A.; Al-Karbooly, Ashour

doi:10.1016/s0014-3057(00)00128-2

Cited by 25 publications

(17 citation statements)

References 7 publications

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“…The results obtained from the TG and DTG curves (Table 1) confirm the hydration degree and the stoichiometry of the prepared PDTA metal complexes (structure 1) that are established [15] by elemental analysis (CHN analyzer) and metal content measurements (Atomic absorption Spectrophotometer). In addition to that, although these polymer-metal complexes are of a particular ligand with various metals, various thermal decomposition behaviour and thermal stability are clearly observed.…”

Section: Resultssupporting

confidence: 69%

“…Complete details of the synthesis, physical measurements, characterization and identification as well as the DC electrical conductivity of the three conducting polymer complexes of interest (PDTA-Fe, PDTA-Co, PDTA-Ni and PDTAZn) and their structure shown in structure 1 are published elsewhere [15].…”

Section: Synthesis Of Polymer Complexes and Physical Analysismentioning

confidence: 99%

“…In our previous studies published elsewhere [15], the temperature variation of the DC electrical conductivity was measured in the range 298 -498 K for the polymer-metal complexes under investigation in the present work, and as a result the activation energies for different temperature segments were worked out. For the reason that a change in the composition may lead to changes of the measured electrical quantities (i.e.…”

Section: Introductionmentioning

confidence: 99%

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Thermal degradation behaviour of some polydithiooxamide metal complexes

et al. 2006

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IntroductionThe well-established thermogravimetric analysis (TGA) and differential scanning calorimetry (DSC) techniques have been reliably widely used over many decades in studying the thermal behaviour and properties of various types of materials and evaluating the thermal parameters for their degradation processes. These methods have allowed determination of the chemical steps of the investigated degradation and the evaluation, by some methods [1,2], of the kinetic parameters for each step. The evaluation of the kinetic parameters has been often performed by using a single thermogravimetric curve (TG curve) recorded at a certain heating rate and atmospheres (under nitrogen or air flow).Some recent results concerning the thermal and thermo-oxidative degradation of polymers or polymeric material, metal complexes, medicinal plant leaves and thermoplastic starch obtained by thermoanalytical methods (TG, DTG, DTA, DSC) have been reported [3 -14]. These reports show that the kinetic parameters evaluated for each step of degradation processes are carried out by using the integral methods considering a reaction order model for the kinetic analysis of the a single thermogravimetric curve data.In our previous studies published elsewhere [15], the temperature variation of the DC electrical conductivity was measured in the range 298 -498 K for the polymer-metal complexes under investigation in the present work, and as a result the activation energies for different temperature segments were worked out. For the reason that a change in the composition may lead to changes of the measured electrical quantities (i.e. the role of adsorbed water), the thermal analysis results (TGA curves) were used only to monitor the loss of adsorbed water in order to study its effect on the DC electrical conductivity at 298 -498 K range. Abstract:The thermal decomposition behavior of the Fe(II), Co(II), Ni(II) and Zn(II) complexes of polydithiooxamide has been investigated by thermogravimetric analysis (TGA) at a heating rate of 20°C min -1 under nitrogen. The Coats-Redfern integral method is used to evaluate the kinetic parameters for the successive steps in the decomposition sequence observed in the TGA curves. The processes of thermal decomposition taking place in the four complexes are studied comparatively as the TGA curves indicate the difference in the thermal decomposition behavior of these complexes. The thermal stabilities of these complexes are discussed in terms of repulsion among electron pairs in the valence shell of the central ion and electronegativity effects.

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Section: Resultssupporting

confidence: 69%

Section: Synthesis Of Polymer Complexes and Physical Analysismentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Thermal degradation behaviour of some polydithiooxamide metal complexes

et al. 2006

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“…Usually a DC voltage is applied to a sample and the current flowing through it is measured [18][19][20][21][22]. Measurements of r-T can be carried out also during monotonic temperature changes and it is applied in studies on polymers and complexes [23,24]. Monotonic heating of the sample induces changes in its dimensions.…”

Section: Introductionmentioning

confidence: 99%

Differential scanning calorimetry and temperature dependence of electric conductivity in studies on denaturation process of bone collagen

Kubisz

Mielcarek

2005

Journal of Non-Crystalline Solids

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“…5 During the past few years the alteration of existing polymeric materials by means of chelation reactions with various metal ions has attracted a good deal of attention. DC electrical conductivity of polydithiooxamide-metal complexes, 6 and poly[4-amino-2,6-pyrimidinodithiocarbamate] and its metal complexes 7 have been investigated by different research groups.…”

mentioning

confidence: 99%

Temperature dependence of electrical conductivity in poly(maleic anhydride‐alt‐acrylic acid) and its transition metal complexes

et al. 2004

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Poly(maleic anhydride-alt-acrylic acid) and its transition-metal complexes with Ni(II), Cu(II), and Cd(II) were synthesized. Poly(maleic anhydride-alt-acrylic acid) was characterized using Fourier transform infrared (FTIR), titration, viscometry, differential scanning calorimetry (DSC), and POLY(MALEIC ANHYDRIDE-alt-ACRYLIC ACID) AND ITS TRANSITION METAL COMPLEXESthermogravimetric (TGA) analysis. The temperature dependence of the conductivity of the copolymer and polychelates of transition metals was investigated between 300 and 453 K. The polychelates and copolymers were also analyzed by using FTIR spectroscopy before and after transition point. The observed conductivity followed by a semiconductor behavior with increasing temperature is discussed in relation to the presence of transition-metal ions. C

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DC electrical conductivity of polydithiooxamide–metal complexes

Cited by 25 publications

References 7 publications

Thermal degradation behaviour of some polydithiooxamide metal complexes

Thermal degradation behaviour of some polydithiooxamide metal complexes

Differential scanning calorimetry and temperature dependence of electric conductivity in studies on denaturation process of bone collagen

Temperature dependence of electrical conductivity in poly(maleic anhydride‐alt‐acrylic acid) and its transition metal complexes

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