Noname manuscript No. (will be inserted by the editor) Electrical impedance and electric modulus based relaxation properties of PVA-TiO2 composite Shital More Ragini Dhokne Nilesh Pathare the date of receipt and acceptance should be inserted later Shital More RTMNU, Nagpur, MS, India E-mail [email protected] Ragini Dhokne Department of Physics, GHRIET Nagpur, MS, India Nilesh Pathare PCE, Nagpur, MS, India 2 Shital More et al. Keywords PVA-ZnO, FTIR, XRD, dielectric properties, electric modulus, EDAX 1 Introduction 1.1 Related work Relaxation Properties of PVA-TiO2 composite3 blend electrolyte23. Bahaa Hussien deduced that DC and AC electrical con-ductivity of PMMA-Al2O3 composites increased with increase in the concen-tration of Al2O324. In the present work, the polymer composites of PVATiO2 have been prepared by solution casting method and relaxation properties of composites by electric modulus and impedance in the temperature range 288 K to 353 K are studied. 2 Experimental Details 2.1 Materials and method The PVA- TiO2 composite was synthesised by cheap and easy solvent casting method12. Polyvinyl alcohol which is the host polymer of this study, of an approximate molecular weight of 124000 g/mol and degree of hydrolysis is 86-89 was obtained from SD fine chemicals limited (SDFCL), Mumbai, India and used as it is. To begin with the addition of 1 gm of PVA with double distilled water at room temperature and stirred the mixture on a magnetic stirrer for getting the uniform solution. The desired quantity (5wt, 10wt, 20wt, 30wt) of TiO2 was dissolved in PVA solution, and the solution was stirred constantly at 50C temperature till become a homogeneous solution. The obtained homogeneous solution was then poured in a flat petri dish and left to evaporate at room temperature for 24 hours. The thin composite film was formed on petri dish and was removed from it after complete dried. The synthesized films stored in vacuum desiccators until use 16, 2426. The thick-ness profilometer was used to measure the thickness of the prepared films and it was lying in between 70-80 m. All the prepared films were named as PVTi-5 , PVTi-10, PVTi-20 and PVTi-30. 2.2 Structural Characterization 4 Shital More et al. 2.3 Impedance Spectroscopy 6 Shital More et al. Fig. 1 FTIR of (a) Pristine PVA (b)PVTi-5 (c)PVTi-10 (d)PVTi-20 (e)PVTi-30 Fig. 2 XRD of (a)PPVA (b)PVTi-5 (c) PVTi-10 (d)PVTi-20 (e)PVTi-30 TiO218. The peak occurs at 35o in the spectra of all PVA/ TiO2 composite, which has not found in pure PVA and pure TiO2 also. The appearance of this new peak might be due to dissociation of PVA, and TiO2 particles during the stirring process, and interaction occur in between PVA and TiO218, 23 . The semicrystalline nature of PVA has been shifting slightly towards amorphous nature with an increase in loading concentration of TiO2 as the apparent fall of PVA peak height and increases in broadness with rising TiO2 loading. This might be happens due to decrease in intermolecular interaction between PVA chains and TiO2 particles via hydroxyl bond thereby reduces the crystalline nature of PVA. Relaxation Properties of PVA-TiO2 composite7 Fig. 3 FESEM images of (a)PVTi-5 (b) PVTi-10 (c)PVTi-20 (d)PVTi-30 3.3 FESEM and EDAX 3.4 Dielectric Properties Relaxation Properties of PVA-TiO2 composite9 Beyond certain high frequency, the dielectric loss ( ) decreases to least value and remains constant for all temperatures and act as a lossless material. It may be attributed that crystalline substance of composite increases with the incorporation of TiO2 is in good agreement with XRD spectra 39, 40. 3.5 Electric modulus dzJlYGahBCCpqPrh@Hq 10If1uPj5/ uuZoROu9YUbfl4JwHduHJ PffMRgS5sL4k)rw7969UcwykR6i1DI@ngRZf-X 1AVisNQEV2G4vKHXbNuQIMqSpEam xn )8ZUX (az@@@(3PEO-tn,,/s P BRTj8mm6,b0.ze rvkGh4PIw01 PKTaymi M
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