nan Mahadevaiah

Polymeric degradation of water soluble chitosan/HPMC films using WAXS data

Abstract Films of cationic chitosan and non-ionic hydroxypropyl methyl cellulose (HPMC) have been prepared by solvent casting method, using glycerol as a plasticiser, from aqueous lactic acid medium. Here, an attempt is made to compare the degradation effect of neutral HPMC and chitosan on water uptake and flexibility in terms of microstructural parameters obtained from X-ray line profile analysis. The intension of this study is to investigate properties for the potential use of chitosan/HPMC films to improve flexibility for packaging, solubility of drug, drug release and biodegradability. Fractured surfaces of the films were examined through wide angle X-ray diffraction and the intensity profiles were used to determine the microstructural parameters. Chitosan and HPMC films have more water retentiveness property compared to other blends studied here.

Spectroscopic analysis of PVA/CMC: NiCuZnFe2O4 polymer nanocomposites

Nickel copper zinc ferrite nanoparticle doped PVA/CMC nanocomposites are synthesized by solution casting method. Wide angle X-ray scattering technique has been used to characterize these nanocomposites. Using Williamson-Hall plot we have determined the microcrystalline parameters like crystallite size and lattice strain for theses samples for various concentration of nanoparticles. We find significant changes in the microstructural parameters with the concentration of nanoparticles. The prepared films are analyzed using FTIR.

Spectroscopic studies of PVA/Gly:Na2SO4 polymer composites

As a continued work on investigating a good conducting polymer, Sodium sulphate doped PVA polymer composites were prepared by solution casting method and subjected to various analytical measurements such as FT-IR spectroscopy, UV/Visible absorbance and Wide angle X-ray scattering technique. The changes observed in the structure of these polymer composites for various concentrations are computed by the results obtained from all above techniques are reported and related with the structure property. The Microstructural parameters of these polymer composites are evaluated using in-house programs.

Characterization of montmorillonite doped PVA/SA blends using X-ray diffraction

PVA films doped with Montmorillonite was prepared by slow evaporation technique. These films have been used to record X-ray patterns at room temperature. Correlation lengths and microstructural parameters were computed using in-house program employing X-ray data. Results show that correlation lengths as well as crystallite size increases with increase in the concentration of Montmorillonite which is inconformity with the conductivity studies.

Structural and ionic conductivity behavior in hydroxypropylmethylcellulose (HPMC) polymer films complexed with sodium iodide (NaI)

Solid polymer electrolyte films based on Hydroxypropylmethylcellulose (HPMC) complexed with Sodium Iodide (NaI) were prepared using solution cast method. The dissolution of the salt into the polymer host and the micro structural properties of pure and NaI complexed HPMC polymer electrolyte films were confirmed by X – Ray diffraction (XRD) studies. The XRD results revealed that the amorphous domains of HPMC polymer matrix was increased with increase in the NaI salt concentration. The degree of crystallanity and crystallite size is high for pure HPMC samples. Direct current (dc) conductivity was measured in the temperature range of 313–383k. Temperature dependence of dc electrical conductivity and activation energy regions data indicated the dominance of ion type charge transport in these polymer electrolyte films.

Structure-property relation in HPMC polymer films plasticized with Sorbitol

A correlation study on physical and mechanical properties of Hydroxy propyl-methylcellulose (HPMC) polymer films plasticized with different weight ratio of Sorbitol, prepared using solution casting method, was carried out using wide angle X-ray technique and universal testing machine. It is found that the crystallanity decreases as the concentration of Sorbitol increases up to a certain concentration and there afterwards increases. Measured Physical Properties like tensile strength decreases and elongation (%) increases indicating increase in the flexibility of the films. These observations confirm the correlation between microstructal parameters and mechanical properties of films. These films are suitable for packaging food products.

A Study on the Burnt Cane Juice Clarification by Different Clarificants

It is generally accepted that after cane has been cut or burnt, it immediately starts deterioration. Burnt cane is known to deteriorate faster than unburnt (green) cane. Burning directly destroys some sugar and also promotes chemical changes that facilitate degradation of sucrose levels and purity. On the other hand the accumulation of impurities, dextran in particular, that results from burning, directly affects the processing and recovery of sugar, with these difficulties increasing as the proportion of burnt cane increases. The present work made an attempt to assess the difference clarification parameters of the burnt cane juice obtained by different sugarcane varieties and applying different flocculants. Experiments have shown decrease in weight, pol, purity and pH and also increase in brix, settling time and turbidity of burnt cut cane juice.