Synthesis, Thermal and Electrical Properties of 2, 2’-HBBF Copolymer Resin

Abstract

Abstract:The copolymer (2, 2'-HBBF) synthesized by the condensation of 2, 2'-dihydroxybiphenyl (2, 2'-HB) and biuret (B) with formaldehyde (F) in the presence of acid catalyst using 1:1:2 molar proportions of the reacting monomers. The thermogravimetric analysis of copolymer resin prepared in the present study has been carried out by non-isothermal thermogravimetric analysis technique in which sample is subjected to condition of continuous increase in temperature at linear rate. The advantage of Freeman-Carroll method is to calculate both the order of reaction (n) and energy of activation in one single stage by keeping heating rate constant. By using data of thermogravimetric analysis, various thermogravimetric parameters like frequency factor (Z), entropy change (ΔS), free energy change (ΔF) and apparent entropy (S*) have been determined using Freeman-Carroll method. The electrical properties of 2, 2'-HBBF copolymers were measured over a wide range of temperature (303-423 K). From the electrical conductivity of these copolymers, activation energies of electrical conduction have been evaluated and values lies in the range 3.01x10 -20 -6.43x10 20 J/K. On the basis of above studies, these copolymers can be ranked as semiconductors.

Synthesis, Spectral Characterization and Kinetic Study of Cu(II) Complex with N-Hexahydrocyclopenta[c]pyrrol-2(1H)-yl carbamoyl-4-methylbenzenesulfonamide

“…The first few points that did not fall on straight line were discarded. These types of deviations of points are reported in literature by several research workers [20][21][22][23][24][25][26][27][28][29] .…”

“…To provide further evidence regarding the degradation system of analyzed compounds, we derived the TG curves by applying an analytical method proposed by Freeman-Carroll 27 and Sharp-Wentworth. 28…”

Synthesis, Spectral Characterization, Magnetic Moment, Mass, X-Ray Diffraction, and Kinetic (TGA) Studies of Cr(III) Complex with Metformin: An Oral Antidiabetic Drug

“…The high value of activation energies reflects the thermal stability of complex. The entropy of activation is found to have negative values in complex which indicate that decomposition reactions process with lower rate than the normal ones [26,[29][30][31][32][33]. In TGA curve (Figure 7) the initial loss (8.30%) (also given in Tables 4 and 5) is due to two molecules of water of crystallization (70-90 ∘ C) in complex which is in agreement with theoretically calculated percentage of water molecule, that is, 8.70%.…”

Synthesis and Semiconducting Behavior of Terpolymer Resin-I Derived from Sulphanilic Acid, Melamine and Formaldehyde

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