Effect of Annealing on the Optical Properties of (PVA-CuCl) Composites

Abstract

ABSTRACT. Films of polymer (polyvinyl alcohol (PVA)) doped with CuCl salt at different concentrations (2 and 10) wt% were prepared using casting technique. The optical properties of the films were studied after annealing. The transmission and absorption spectra have been recorded in the wavelength range of (300-1100) nm. The effect of annealing on the optical properties for (PVACuCl) films with different concentrations (2 and 10) wt% of copper chloride salt shows that the transmittance decreased after annealing for all the films. The optical constants (absorption coefficient, refractive index, extinction coefficient, real and imaginary parts of dielectric constant) for all the films are affected by annealing. The energy gap (E g ) of all the films decreased after annealing. 1-INTRODUCTIONPolymers have existed in natural form since life began and those such as DNA, RNA, proteins and polysaccharides play crucial roles in plant and animal life. From the earliest times, man has exploited naturally-occurring polymers as materials for providing clothing, decoration, shelter, tools, weapons, writing materials and other requirements [1].The properties of polymer-mineral reinforced composites are determined by the component properties (particle shape, surface area, surface chemistry, polymer microstructure) and by the preparation method and processing conditions as well. Among of preparation methods, injection molding has strong influence on the internal microstructure of polymers and in a consequence on mechanical response of the material [2]. Nowadays, thermoplastic polymers are widely used in various aspects of human society. They have several good properties such as good chemical resistance, better mechanical properties, cost effectiveness; that make them the polymers of choice for numerous applications. Due to superior properties of these materials, they have been used mixed with natural fillers and in manufactured composite forms as well. The use of thermoplastic polymer composites reinforced with natural fillers has been rapidly increasing in the automotive industry [3].Polyvinyl alcohol (PVA) is a water-soluble synthetic polymer. Due to the characteristics of easy preparation, good biodegradability, excellent chemical resistance and good mechanical properties, (PVA) has been used in many biomaterial applications [4]. Doping of polymers attracted the scientific and technological researchers, because of their wide applications. The dopants in polymer can change the molecular structure and hence the microstructure as well as the macroscopic properties of the polymer [5]. 2-MATERIALS AND METHODSThe materials used in this work were as a powder of polymer (polyvinyl alcohol (PVA)) doped by copper chloride CuCl salt with weight percent (2 and 10) wt%. It was dissolved in (15 ml) of distilled water in glass beaker by using magnetic stirrer for about (45 minute) and placed in Petri dish (5 cm diameter) using casting technique to prepare the films. The thickness of the dried films is (45 µm) measured by digital micrometer....

Study of the nanostructure of free volume and ionic conductivity of polyvinyl alcohol doped with NaI

“…PVA may be a water-soluble synthetic polymer and because of its characteristics of simple preparation, sensible biodegradability, wonderful chemical resistance, and sensible mechanical properties, PVA has been utilized in several biomaterial applications. 17 It has an excellent film forming and adhesive properties that making it has many technological applications. [18][19][20] PVA structure includes a carbon chain backbone with hydroxyl groups which will act as a supply of hydrogen bonding to improve the formation of polymer complexes.…”

“…Polyvinyl alcohol (PVA) is a semi crystalline polymer characterized by high dielectric strength, high elasticity, high tensile strength, and good charge storage capability. PVA may be a water‐soluble synthetic polymer and because of its characteristics of simple preparation, sensible biodegradability, wonderful chemical resistance, and sensible mechanical properties, PVA has been utilized in several biomaterial applications 17 . It has an excellent film forming and adhesive properties that making it has many technological applications 18‐20 .…”

A Study of FTIR and some Mechanical Properties of Sodium Iodide (NaI) Salt Filled Polymer Polyvinyl Alcohol (PVA) Films

“…(PVA) is a water soluble synthetic polymer and due to its characteristics of easy preparation, good biodegradability, excellent chemical resistance and good mechanical properties, the polymer (PVA) has been used in many biomaterial applications [3].…”

The electrical and mechanical properties of Cadmium chloride reinforced PVA:PVP blend films

“…Their physical properties are therefore of great importance, and an understanding of them is vital for their use in technology and engineering [1]. The blending of different polymers or inorganic ma-terials with polymers represents a strategic route to improving the performance of a material, and allows the realization of novel composite systems that enhance the performance of the parent blend [2]. Polyvinyl alcohol (PVA) is a versatile, polyhydroxy polymeric material which has gained the interest of researchers due to its many potential applications, and the scope for easy modification and formation of useful miscible blends with many other polymers.…”