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دراسة تاثير معقداث معدنية على الخواص البصرية والكهربائية وفوق السمعية لاغشية بولي فينيل الكحول وبولي فينيل استيت المحضرة بطريقة الصب == Studying the Effect of Metal Complexes on the Optical, Electrical and Ultrasound Properties of PVA and PVAc Films Prepared by Casting Method
اسم المؤلف:
الاء جواد كاظم الكدساوي
اسم المشرف:
ندى خضير عباس | مجيد علي حبيب
الموضوع العام:
علوم الفيزياء
السنة:
2005
الموضوع الدقيق:
فيزياء الحالة الصلبة والمواد
الدرجة:
ماجستير
الجامعة:
جامعة بغداد - كلية العلوم للبنات - قسم الفيزياء
اللغة:
الانكليزية
مكان الجامعة:
بغداد
الصفحات الاولى:
📎 26T1788 - p.pdf
المستخلص:
The present study focused on the modification of the structural, optical and electrical properties and acoustical parameters of poly (vinyl alcohol), poly (vinyl acetate) and polyblend of (poly (vinyl alcohol) + poly (vinyl acetate)) by adding (0, 3, 6 and 9) wt.% of metal complexes, which are : Chloropentaaminecobalt (III) chloride [Co(NH3)5Cl]Cl2 and Potassium Dioxalatocuprate (II) Dihydrate K2[Cu(C2O4)2].2H2O. The mentioned composites films were prepared by solvent casting technique.All samples were structurally investigated by X - ray Diffraction XRD, Fourier transform infrared spectroscopy FTIR, Scanning electron microscope SEM which revealed that there is an association between the polymer matrix and the additive.The optical data at wavelengths range (190 - 800) nm, were analyzed and interpreted in term of the theory of phonon assisted indirect electronic transition. It is observed that energy gap decreases as the metal complexes content increases. The smallest obtained energy gap is 1.86 eV for PVAc / [Co(NH3)5Cl]Cl2 composites films. The refractive index, extinction coefficient, and the dielectric constant increase with increasing the concentration of the additive.The D.C electrical conductivity increases with temperature which exhibited a semiconductor behavior. Also the activation energy values are decreases with increase of additive concentration.The A.C electrical conductivity is increased with increasing applied electrical field frequency (102 to 5*106) Hz and with additive concentration. The dielectric constant and dielectric loss were decrease with increasing the frequency and increase with the concentration of the additive.The acoustical parameters have been measured in frequency range of (25, 30, 35 and 40) KHz. Metal complex enhances the ultrasonic absorption coefficient of polymer matrix. The velocity decreases with increasing metal complex.
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