VISCOMETRIC STUDY OF 4,4’ NAPHTHYL BIS(OXY) BIS BENZALDEHYDE AND ITS SCHIFF BASE POLYMERS IN DMAC SOLUTION AT DIFFERENT TEMPERATURES

A. SHAH, M. Y. KHUHAWAR KHUHAWAR, A. A. SHAH

Abstract


Viscometricparameter is a simplest method to determine molecular shape, size and weight of unknown compound. In the present work, 4,4’ Naphthyl bis(oxy) bis benzaldehyde and its Schiff base polymeric solutions were prepared in DMAc atdifferent temperatures, to investigate dilute solution viscometry (DSV). These Schiff base polymers were prepared by polycondensation reaction of dicarbonyl compound 4,4’ Naphthyl bis(oxy) bis benzaldehyde (NBOB) and diamines (ethylenediamine and 1,2-propylenediamine). The elemental microanalysis results are in good agreement with the theoretical values calculated. Polymeric solutions were characterized by FTIR, UV-Vis and 1H-NMR spectroscopic techniques. The intrinsic viscosity and viscometric constants of these solutions were calculated by specific equations such as Huggins and Kramer. Actually the viscosity behavior of macromolecular substances in solution is one of the most frequently used approaches for characterization. It was observed that the variation of viscosity number with concentration depends on the type of molecule as well as the solvent. The thermodynamic parameters (∆G, ∆S and ∆H) were also calculated. The accuracy and validity of these methods were evaluated.

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