The Properties of (PVA-CNTs) Nanocomposites

Nanocomposites are used in many industries such: solar cells, light emitting diodes, optoelectronic device, aircraft and cars. This paper is aimed to preparation of (PVA-CNTs) nanocomposites to using the new materials in many industries. Using the nanocomposites in these applications need to study the electrical, optical and mechanical properties which investigated in this paper. The samples of nanocomposites are prepared by using casting technique with different concentrations of carbon nanotubes. The optical properties of nanocomposites are measured in the wavelength range (200-800) nm. The results showed that the absorption coefficient, extinction coefficient, refractive index and real and imaginary dielectric constant of nanocomposites are increasing with increase the carbon nanotubes concentrations. The D.C electrical properties of (PVA-CNTs) nanocomposites are studied in the range of temperature (from 500C to 800C). The results found the electrical conductivity is increased with increasing the carbon nanotubes concentration and temperature. The activation energy is decrease with increasing the weight percentages of carbon nanotubes. Also, the mechanical properties of (PVA-CNTs) are investigated. Results showed that velocity of ultrasonic wave, specific acoustic impedance, bulk modulus and compressibility change with increase the concentration of carbon nanotubes. Keywords: Nanocomposites, optical, electrical, mechanical propertie

Synthesis of (Polymer blend-MgO) Nanocomposites and Studying Electrical Properties for Piezoelectric Application

Nanocomposites prepared by casting method with different percentages of nano magnesium oxide (0, 1.5, 3, 4.5 and 6) wt%.The structural and electrical properties of (PAA-CMC-MgO) nanocomposites were studied.The experimental results of Scanning electron microscopy shows the surface morphology of the (PAA-CMC-MgO)  nanocomposites where many aggregates or chunks randomly distributed on the top surface, homogeneous and coherent.The D.C electrical conductivity for (PAA-CMC-MgO) nanocomposites increased with increasing of temperature and magnesium oxid nanoparticles concentration, while activation energy decreases with increasing of the  magnesium oxid nanoparticles concentration.The A.C electrical properties show that the dielectric constant and dielectric loss of the nanocomposites decrease with increasing the frequency of applied electrical field and they increase with the increase of  the concentration of the magnesium oxide  nanoparticles. The A.C electrical conductivity increases with increasing the concentration of magnesium oxide nanoparticles and also increases with the increase frequency, as well as almost constant at high frequency.The results of sensor application showed that the electrical resistance of (PAA-CMC-MgO) nanocomposite decreases with increases in pressure

Preparation and Study Optical Properties of (PVA-PVP-CrCl2) Composites

In present research, the effect of addition chromium chloride (CrCl2) on the optical properties of (PVA-PVP) composite has been studied, samples have been prepared by adding (CrCl2) to poly vinyl alcohol and poly vinyl pyrrolidone with different weight percentages, the absorbance spectra was recorded in the wavelength range            (200-1100) nm. The absorption coefficient, optical energy gap of the indirect transition, extinction coefficient, refractive index and (real, imaginary) dielectric constant have been determined. Keywords: Optical properties, (PVA-PVP) composites, chromium chloride

The Effect of Sodium Fluoride on Optical Properties of Polyvinyl pyrrolidone

The Composites Materials are important in many applications and industries. For the importance of these materials, this paper is aimed to study optical properties of (PVP-NaF) composites. The effect of sodium fluoride on optical properties of polyvinyl pyrrolidone has been investigated. The samples of (PVP-NaF) composites are prepared by using casting technique. The optical properties of (PVP-NaF) composites were measured in the wavelength range (200-800) nm. Results showed that the absorbance, absorption coefficient, extinction coefficient, refractive index and  real and imaginary dielectric constants of polyvinyl pyrrolidone are increasing with increasing the sodium fluoride concentrations. The energy band gap of polymer is decreased with increasing of the sodium fluoride concentrations. Keyword: sodium fluoride, optical properties ,polymer.

Effect of Potassium Chloride on Physical and Optical Properties of Polystyrene

Composite materials are used in many industries such: solar cells, optoelectronic device elements, light emitting diodes, aircraft, military and car industry. In this paper, effect of potassium chloride on physical and optical properties of polystyrene has been studied to use the new material in many applications. The physical properties showed that the absorption of composite to water increases with increase time of the submerging in the water. Also, diffusion coefficient increases with increase the potassium chloride concentrations. The optical properties was measured in wavelength range from 200nm to 800nm. The experimental results showed that absorbance of polystyrene increases with increase  the potassium chloride concentrations. The optical constants (absorption coefficient, energy band gap, extinction coefficient, refractive index and real and imaginary parts of dielectric constants) are increasing with increase the potassium chloride concentrations. Keywords: optical properties, composites, physical properties, potassium chloride

Characterization of (PVP-KCl) Composites

The polymers have uses in many industries. The addition of electrolytes to the polymers are produced a new materials use in many applications. Hence, in this paper study the effect of potassium chloride on the optical properties of polyvinyl pyrrolidone. The potassium chloride was added to polymer with different concentrations. The samples were prepared by using casting technique. The optical properties were measured in the wavelength range (200-800) nm. The experimental results showed that the absorbance (A), absorption coefficient (?), extinction coefficient (k), refractive index (n),  real and imaginary dielectric constants (?1 and ?2) of polyvinyl pyrrolidone are increasing with the increase of the potassium chloride weight percentages. The energy gap (Eg) of polyvinyl pyrrolidone decreases with the increase of the potassium chloride weight percentages. Keyword: optical properties , potassium chloride, polyvinyl pyrrolidone

Synthesis of Novel (Polymer Blend-Titanium Carbide) Nanocomposites and Studying their Characterizations for Piezoelectric Applications

ان المواد المتراكبة الكهروضغطية مهمة جدا" لتطبيقات عديدة منها: متحسسات الضغط. لذلك تم تصنيع المتراكبات النانوية (بولي فينيل الكحول- بولي فينيل بيروليدون- كاربيد التيتانيوم) ودراسة خواصها التركيبة، الكهربائية، العزلية والبصرية. درس تاثير اضافة جسيمات TiC النانوية على الخواص التركيبية، الكهربائية، العزلية والبصرية للخليط البوليمري. بينت النتائج ان التوصيلية الكهربائية للمتراكبات النانوية (PVA-PVP-TiC) تزداد مع زيادة تركيز جسيمات TiC النانوية عند درجة حرارة الغرفة. اختبار FTIR اوضح عدم وجود تفاعلات بين الخليط البوليمري (PVA-PVP) و جسيمات TiC النانوية. بينت الدراسات العزلية ان ثابت العزل والفقدان العزلي للمتراكبات النانوية يزدادان مع زيادة تراكيز جسيمات TiC النانوية ويقلان مع زيادة التردد. وان التوصيلية الكهربائية المتناوبة تزداد مع زيادة تراكيز جسيمات TiC النانوية والتردد.اوضحت  نتائج الخواص البصرية ان الامتصاصية البصرية  للخليط البوليمري (PVA-PVP) تزداد مع زيادة تركيز جسيمات TiC النانوية. وان الثوابت البصرية تغيرت مع زيادة تركيز جسيمات TiC النانوية. بينت نتائج تطبيق الكهروضطية للمتراكبات النانوية (PVA-PVP-TiC) ان المقاومة الكهربائية للمتراكبات النانوية   (PVA-PVP-TiC) تقل مع زيادة الضغط مما يجعلها مناسبة لتطبيقات الكهروضغطية او متحسسات الضغط.  Piezoelectric nanocomposites are very important for many applications as a pressure sensors. Fabrication of (polyvinyl alcohol - polyvinyl pyrrolidinone -titanium carbide) nanocompos- ites and study their structural, electrical, dielectric and optical properties have been in- vestigated. The effect of adding the TiC nanoparticles on structural, electrical, dielectric and optical properties of polymeric blend has been studied. The results showed that the electrical conductivity of (PVA-PVP-TiC) nanocomposites is increasing with the increase of TiC nanoparticles concentrations at room temperature. The FTIR analysis showed there is no interactions between (PVA- PVP) polymer blend and TiC nanoparticles. The dielectric studies showed the dielectric constant and dielectric loss of nanocomposites increase with the increase of TiC nanoparticles concentrations and they decrease as frequency increased. The A.C electrical conductivity increases with the increase of TiC nanoparticles concentra- tions and frequency. The results of optical properties showed that the optical absorbance of (PVA- PVP) polymer blend increases with the increase of TiC nanoparticles concentrations. The optical constants change with increase in TiC nanoparticles concentrations. The piezo- electric application results of (PVA-PVP-TiC) nanocomposites showed that the electrical resistance of (PVA-PVP-TiC) nanocomposites decreases with an increase of the pressure which make it is suitable for piezoelectric applications or pressure sensors

Effect of Si3N4/TaC nanomaterials on the structural and electrical characteristics of poly methyl methacrylate for electrical and electronics applications

     In this study, the casting method was used to prepared PMMA/Si3N4/TaC nanocomposites with variant content (0,2,4,6,8) % wt of Si3N4/TaC nanoparticles. The structural and electrical properties have been investigated. Scanning electron microscope (SEM) indicate that the homogenous, smooth and dispersed of Si3N4 and TaC NPs inside the PMMA matrix due to strong covalent interaction between the Si3N4 and TaC NPs in the PMMA matrix which mean a good method for prepared films. Optical microscope images explained that when increasing in content of nanoparticles that forming network paths inside the polymeric matrix that act as charge carriers. FTIR spectra indicate to a physical interference between the polymer matrix and nanoparticles. The AC electrical properties of nanocomposites obtained that the dielectric constant and dielectric loss rise with rising content of nanoparticles and decrease with rising frequency of applied electric field. While the A.C electrical conductivity rise with rising the frequency and weight content of Si3N4/TaC nanoparticles. This results indicated that the PMMA/Si3N4/TaC nanostructures can be considered as promising materials for electronics and electrical nanodevices