This paper presents a sight about the chemical structure deformation of poly (ethylene-co-vinyl acetate) (EVA) samples according to the change ratio of rate constant values. Spectroscopy kinetics fluorescence curves are fitted for two characteristic wavelength domains of fluorescent intensities. The short wavelengths (320-400 nm) domain show spectra overlapping, while at long wavelengths (400-800 nm) domain spectra are arranged in regular for each specific accelerated aging time. The ratio of kinetics rate constant at long wavelengths to kinetics rate constant of short wavelengths is the criterion of the degree chemical structure deformation. Molar extrinsic coefficient relies on the chemical structure change. Through absorbance measurement, EVA samples have been classified into two groups. Presence of Cyasorb additive is the key point of the ranking. The effect of three different accelerated aging of dry (115 oC), damp (85% moisture, 85 oC), and irradiated (UV, 65 oC) aging have been considered for two samples of each group over different aging time. Spectroscopy of absorbance and fluorescent for aged samples have been discussed. In general, Cyasorb adding causes higher chemical structure deformation for the EVA sample. The most effective factor is the damp aging and the less one is the UV irradiation aging, while the biggest chemical structure change of Cyasorb-free sample is produced by damp aging and the less by dry heat.
The widespread application of poly methyl methacrylate (PMMA) attracted the exerting efforts here to investigate the ability of production Nano fibers of this polymer material enhanced by natural chlorophyll pigment. The work aimed to construct a general visualization about the allowed bound of the addition of the natural chlorophyll pigment to PMMA nanofiber by presenting a general statistical model. Different chlorophyll concentrations were added to the matrix material throughout preparing the specimens. Production of nanofibers has been concocted by using the electrospinning technique. The reliable assessment norm in this paper is the extent of compatibility of the additive concentration in the used polymer. The results of viscosity of the variant solutions, images of Scanning electronic microscope SEM, Analysis of Fourier Transformation Infrared Radiation FT-IR, demonstrated their subordination to the Gaussian distribution versus the chlorophyll concentration. The distinctive allocation revealed two asymmetric plateaus. The smaller first one represented the manner properties of the homogenous Nano fibers. However, the great plateau symbolized the behavior of the heterogeneous specimens. The gained regions determined the allowed limits of the homogeneity and heterogeneity of the Nano fibers depending on the additive chlorophyll concentration.
In this research, new titanium metal complexes were designed and prepared for use in biophysical applications, because titanium is biocompatible (non-toxic and accepted by the body). New models of TiMC were designed and prepared by DFT/B3LYP method with SDD base sets and chemical vapor deposition technology, respectively. Structural, electronic transitions, and surface morphology properties were calculated by Gaussian 09 program package, XRD and SEM. The optimized structures for molecules under study have been found in great concurrence with empirical information. The results showed that these complexes have an electronic transition, UV-Vis spectrum, low band gaps, low chemical potential and are softer, can easily interact with enzymes because the enzymes are big soft molecules. The present study is aimed at investigating the effect of TiMC in Biophysics. Moreover, we used an orbital analysis, counting the 3-D electron density and electrostatic potential surfaces to find out the possible orbital hybridization for molecules, thus determining the biological effectiveness of the molecules under study.
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