Polythiophene (PTh) -polyvinyl acetate (PVAc) composite fi lms were prepared by chemical oxidative polymerization with ZnCl 2 as oxidant, in methanol solvent at room temperature. In this study DC conductivity as a function of temperature was measured. An attempt has been made to investigate the effect of temperature and concentration of ZnCl 2 oxidant on the conductivity of polythiophene and polyvinyl acetate composite fi lms. For fi xed wt % of PVAc, the DC electrical conductivity initially increases with the molar concentration of ZnCl 2 which increases the rate of polymerization and then decreases with further increase in concentration of ZnCl 2 due to reduced segmental motion of the polymer. The Fourier transforms infrared (FTIR) spectra reveal that the structure remains the same throughout the series. The small shift in the observed peak frequencies is due to composition change of ZnCl 2 , but the overall trend of the IR spectra is the same. From the fi nger print region it is observed that the terminal branching is completely absent. The ionic transference number is calculated from the polarization current versus time plot. Ionic contribution is found to be dominant. The thermo gravimetry (TG) curves of the samples show single step degradation.
The ultrasonic velocity (u), density (ρ) and viscosity (η) have been measured for substituted aryl Bisthiourea in binary solution at 298K temperature by using ultrasonic interferometric technique. The observed experimental data have been used to study molecular interactions in different percent composition of 1,4 dioxane and water binary solution for different parameters such as adiabatic compressibility, apparent molar volume, apparent molar compressibility, relative association, acoustic impedance , free length, and relaxation time.
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