Synthesis and electrical conductance studies of p-Cresol-Adipamide- Formaldehyde Copolymer (original) (raw)

Study of electrical property, adsorption chromatography and thermalstability of p-cresol and oxamide with formaldehyde terpolymer resin-IV

2011

Terpolymer resin p-COF-IV was synthesized by the condensation polymerization of reacting monomers. The electrical property of p-COF-IV terpolymer was measured over a wide range of temperature (313-423K), activation energy of electrical conduction has been evaluated and plot of log s vs 103/T is found to be linear over a wide range of temperature, therefore can be ranked as semiconductor. The adsorption chromatography chelating ion-exchange properties of this terpolymer was studied for Fe (III), Cu (II), Ni (II), Co (II), Zn (II), Cd (II) and Pb (II) ions. A batch equilibrium method was employed in the study of the selectivity of metal ion uptake. The study was carried out over a wide pH range, shaking time and in media of various ionic strengths. The terpolymer showed a higher selectivity for Fe (III), Cu (II), and Ni (II) ions than for Co (II), Zn (II), Cd (II) and Pb (II) ions. Thermal study of the resin was carried out to determine its mode of decomposition and thermal stability....

Electrical Conductance Properties of a Copolymer Resin Derived From 4-Hydroxyacetophenone and Catechol

– The copolymer resin 4-HACF has been synthesized by the condensation of 4-hydroxyacetophenone (4-HA) and catechol (C) with formaldehyde (F) in 2:1:3 molar ratios in presence of 2 M hydrochloric acid as catalyst. Scanning electron microscopy (SEM) was used to determine the surface features of the resin. UV-Visible, IR and proton NMR spectral studies have been carried out to elucidate the structure of the resin. Electrical conductivity measurements have been carried out to ascertain the semiconducting nature of the copolymer resin. The electrical properties of 4-HACF copolymer were measured over a wide range of temperature (313-428K), activation energy of electrical conduction has been evaluated and plot of log s vs 103/T is found to be linear over a wide range of temperature, which can be ranked it as semiconductor. This remarkable property of this copolymer resin may be used to make a wide range of semiconducting and electronic devices such as transistors, light emitting diodes, solar cells and even lasers which can be manufactured by much simpler way than conventional inorganic semiconductors.

Synthesis, Characterization, and Electrical Properties of Copolymer Derived from 2-Amino 6-nitrobenzothiazole, Dithiooxamide and Formaldehyde

International Journal of Advanced Research in Science, Communication and Technology, 2021

The BDF-II copolymer was synthesized by reacting2-amino 6-nitrobenzothiazole and dithiooxamidewith formaldehydein the presence of 2 M hydrochloric acid as a catalyst in 2:1:3 molar ratios. UV-visible, FTIR, and proton NMR spectral analysis were used to figure out the structure of the copolymer.The surface features of the copolymer were determined using scanning electron microscopy (SEM). The semiconducting nature of the copolymer was determined through electrical conductivity measurements. The electrical properties of the BDF-II copolymer were measured over a wide temperature range from 313-428K, the activation energy of electrical conduction was calculated, and the plot of log б vs 1000/T was found to be linear over a wide temperature range, classifying it as a semiconductor.

New Polymer Syntheses Part: 55#. Novel Conducting Arylidene Polymers and Copolymers Based on Methyl-Cyclohexanone Moiety

Journal of Research Updates in Polymer Science, 2014

A new interesting class of conducting polymers based on methyl-cyclohexanone in the polymer main chain has been synthesized by solution polycondensation of terephthalaldehyde with methyl-cyclohexanone. Copolymers containing different cycloalkanone moieties were also synthesized using solution polycondensation technique. The model compound I was synthesized by the interaction of methyl-cyclohexanone monomer with benzaldehyde, and its structure was confirmed by elemental and spectral analyses. The resulting new polymers and copolymers were characterized by elemental and spectral analyses, beside solubility and viscometry measurements. The thermal properties of those polymer and copolymers were evaluated by TGA, DrTGA and DTA measurements and correlated to their structural units. PDT as well as T10 was in the range from 205 to 370 ºC. In addition, T10 thermal stability for all the polymers was in the order: VI> II > III > IV > V. X-ray analysis showed that it has some degree of crystallinity in the region 2 = 5-60 degree.The UV-visible spectra of some selected polymers were measured in DMSO solution and showed absorption bands in the range 265-397 nm, due to n-* and-* transition. The morphological properties of copolymer IV as selected examples were tested by SEM. The electrical conductivities of the synthesized polymers and copolymers enhanced to become in the range of 10-9-10-8 S cm-1 by doping with iodine.

Soluble semi-conductive chelate polymers containing Cr(III) in the backbone: Synthesis, characterization, optical, electrochemical, and electrical properties

Polymer, 2009

Soluble kinds of coordination polymers containing Cr(III) ion in the backbone were synthesized. Structures of the polymers were characterized by FT-IR, UV-vis, 1 H and 13 C NMR, and size exclusion chromatography (SEC). Thermal degradation data were obtained by TG-DTA and DSC techniques. Cyclic voltammetry (CV) measurements were carried out and the HOMO-LUMO energy levels and electrochemical band gaps ðE 0 g Þ were calculated. Additionally, the optical band gaps (E g) were determined by using UV-vis spectra of the materials. Electrical conductivity measurements of doped (with iodine) and undoped polymers related to temperature were carried out by four-point probe technique using a Keithley 2400 electrometer. Measurements were made by using the polymeric films deposited on ITO glass plate by dip-coating method. Also, absorption spectra of doped polymeric films were recorded by a single beam spectrophotometer showing that doping procedure causes shifting in absorption spectra. Their abilities of processing in gas sensors were also discussed. According to obtained results the synthesized chelate polymers are semiconductors having polyconjugated structures. Also, P-2 is the most electro-conductive polymer among the synthesized, while P-1 is the most thermally stable one.

Electrical conductivity study of resin synthesized from 1-naphthol-4-sulphonic acid and hexamethylene diamine and formaldehyde

2014

A terpolymer 1-N-4-SAHDF-Resin-II was synthesized from 1-Naphthol-4-sulphonic acid and Hexamethylene diamine with formaldehyde by polycondenssation method in an acidic medium with molar proportion of reactants (2:1:3).To reveal the structure of the resin, the resin was characterized by elemental analysis and spectral methods, i.e. composition of terpolymer has been determined on the basis of its elemental analysis. The terpolymer resin has been characterized by UV- Visible, FT-IR and NMR (1H & 13C) spectra and by SEM. The DC conductivity of sample was determined by four probe method. The conductivity of 1-N-4-SAHDF-Resin-II was found to be in the range of 1.021 x10-7 to 9.247 x 10-5 ohm-1cm-1 in the temperature range 313K-433K. The activation energy of the conduction for 1-N-4-SAHDF-Resin-II was found to be 1.14 x 10-20 J/K.

A study on the temperature dependence of the electrical conductivity of a pyrolysed cyano-substituted polyamide derived from 1,4-bis(2-cyano-2-carboxyvinyl)benzene

Polymer, 1994

An unsaturated polyamide with pendant cyano groups was prepared from 1,4-bis(2-cyano-2-carboxy-vinyl)benzene, and its electrical conductivity was studied, as a function of temperature, following pyrolysis at 550, 650 and 700°C. The results show that the unpyrolysed polymer has insulating properties at room temperature, whereas a dramatic increase of the electrical conductivity is observed with increasing pyrolysis temperature, ranging from 6.451 × 10−6 S cm−1 at 550°C to 8.130 × 10−1 S cm−1 at 700°C. The temperature dependence of the electrical conductivity of the pyrolysed polymer suggests that the resulting material has semiconducting properties. The observed electrical conductivity is thermally activated, and may be associated with both intermolecular and intramolecular conduction processes, with activation energies ranging from 0.13 to 0.02 eV for the intermolecular conduction process and from 0.26 to 0.05 eV for the intramolecular process, depending on the pyrolysis temperature that is used.

Synthesis, Thermal and Electrical Properties of Copolymers Based on 4,4’-BIPHENOL

Journal of emerging technologies and innovative research, 2020

A series of copolymer resins (4,4’-BP-TETA-F) have been synthesized by condensation polymerization of 4,4’-biphenol and triethylenetetramine with formaldehyde in presence of base catalyst. Thermal analysis was carried out in air atmosphere at the heating rates of 10 C/min for studying its thermal degradation behavior and kinetics. Thermal degradation curve depicts three stages of decomposition and has been discussed with minute details by applying Freeman-Carroll, Sharp-Wentworth and Coat-Redfern equations to evaluate the kinetic parameters i.e., activation energy (Ea), order of reaction (n) and frequency factor (z). The data from FreemanCarroll method has been used to determine various thermodynamic parameters i.e., entropy change (ΔS), free energy change (ΔF) and apparent entropy (S*). The electrical property of 4,4’-BP-TETA-F copolymer resin was measured over a wide range of temperature (313 – 423 K). Electrical conductivity of the copolymer resin was found to be in the range of ...

Polyarylenealkenylenes and Polyheteroarylenealkenylenes XVIII. Polycondensation of 5-Methylfuran-2-carbaldehyde— An Easy Route to Electrically Conductive Materials

Polymer Journal, 1994

The synthesis of dark brown poly(2,5-furan-diylvinylene) (1) via aldol condensation reaction of 5-methylfuran-2-carbaldehyde as an one pot reaction yields an organic semiconductor which has long-lasting stability in the presence of air and water (tested over 10 years). Decolorization (decomposition) was observed only under long-time illumination. The reaction products were characterized by IR-, 1 H NMR-, mass-spectrometry and elemental analysis. Polymer 1 can be oxidized (doped) with Lewis acids such as iodine, AsF 5 and FeCl 3. The values of the electrical conductivity range from 10-8 S cmi for the pristine material (activation energy E.=0.36eV) up to l.5x 10-2 scm-1 for the AsF 5 complex (E.=0.lOeV). Pristine oligomeric material is fusible and can be used to improve the mechanical properties of the polymeric material.