Characterization of Zinc Nanoferrite Doped HPMC Polymers Using X-Ray Diffraction

HPMC Polymer composites were prepared by doping various concentrations of Zinc ferrite nanoparticles using solution casting method. These polymer composites were characterized using X-Ray Diffraction and conductivity measurements. The addition of nanoferrites in the polymer matrix do change the structural and the AC conductivity properties of the film, which is supported by the results obtained and they are discussed briefly in this paper

Radial distribution function of natural fibres and synthetic water soluble polymers using X-ray diffraction

Radial distribution functions for few natural polymers like silk, cotton, and synthetic water soluble polymers like polyvinyl alcohol, hydroxy propyl methylcellulose and carboxy methyl cellulose have been studied using their X-ray diffraction data. It is observed that the radial distribution function for the polymers of the same family gives same correlation function, showing that the pair correlation or the radial molecular arrangement between the nearest neighbors in these polymers are same, irrespective of their nature and existence. The detailed report of radial distribution functions of polymers is briefly explained in this study and the comparison between the samples belonging to the same family is carried out on the basis of inter-molecular interactions. The microstructural parameters like crystallite size and lattice strain are also computed for all the samples using W-H plot method. The crystallite sizes obtained for these polymers are compared and then interpreted with the obtained pair correlation functions. It is observed that the natural fibres show higher correlation function than synthetic polymers studied in comparison, this is due to ordered arrangement of molecules which are found only in some pockets of a general amorphous regions of natural polymers. The standard method of computation of pair correlation value using X-ray data is also given here

Crystal and molecular structure of muga wild silk fibres based on [Ala-Gly]n sequence using LALS technique

X-ray diffraction pattern of muga wild silk fibres has been recorded using imaging plate system (Dip-100S). In order to identify various Bragg reflections and to compute X-ray intensities of these reflections, fibre processing software (CCP13) has been used. A molecular model is first constructed with standard bond lengths and angles using helical symmetry and layer-line spacing observed in the X-ray pattern. The model is then refined against observed X-ray data using linked atom least squares method. The crystal and molecular structure of muga wild silk fibres are compared with reported domestic and wild silk fibre. We could get good R–factor with refinement of a model having beta-pleated sheet structures formed by hydrogen bonds having antipolar – antiparallel arrangement

Preparation and characterization of conductive PVA/Gly:Na2SO4 polymer composites

Polymer composites were prepared by adding sodium sulphate to water-soluble polymer polyvinyl alcohol by solution casting method. Characterization of these polymer composites was carried out using analytical studies like wide-angle X-ray scattering (WAXS), FT-IR spectroscopy, UV/Vis spectrophotometry and conductivity measurements. Microstructural parameters of polymer composites were computed using an in-house program. Structure–property relationship is established by explaining observed experimental results. General observation being that the addition of sodium sulphate to a polymer will lead to the increase in conductivity and make them suitable for applications

Determination of crystallite shapes in polymer composites using X-ray diffraction results

A new method is discussed in this study to compute the crystallite shape in a material by considering X-ray diffraction data of a polymer composite system. Using this, one can estimate the ordered crystalline region in a material; understand its internal morphology to relate its dependence and influence on the other physical parameters. This study is carried out for HPMC:NiCl2 polymer composites of various concentrations, prepared by solution casting method