فهرست مطالب

Progress in Color, Colorants and Coatings
Volume:11 Issue: 3, Summer 2018

  • تاریخ انتشار: 1397/05/27
  • تعداد عناوین: 6
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  • A.R. Grayeli Korpi, P. Balashabadi, M. M. larijani, M. Habibi, A. Hamidi, M. Malek Pages 129-135
    Titanium nitride thin films were grown on 304 stainless steel substrates at various nitrogen/argon flow ratios by ion beam sputtering (IBS) technique. The current research is a follow up study on the influence of gas ratio on structural and corrosion properties in the TiN coated 304 stainless steel. Film structural identification of phases was performed using X-ray diffractometry (XRD). Scanning electron microscope (SEM) was employed to study surface morphology and also elemental analysis of samples after corrosion test was conducted by energy dispersive spectroscopy (EDS). Through our results, we showed that the films deposited under an Ar: N2 ratio of 50(sccm):7(sccm) exhibited a TiN(200) preferred orientation. The corrosion behavior of the samples was evaluated by potentiodynamic polarization test in 3.5% NaCl solution. A critical gas ratio was found at which the corrosion resistant was highest. The correlation between corrosion resistance, structural and surface morphology was examined.
    Keywords: TiN thin films, corrosion, Potentiodynamic, Stainless steel, SEM
  • F. Soltaninejad, M. Shahidi Pages 137-147
    The corrosion behavior of mild steel (Ck 45) in 3.0 M H3PO4 solution in the absence and presence of penicillin G was studied using potentiodynamic polarization and electrochemical impedance spectroscopy (EIS) techniques. The best inhibition effect at 10 mM of drug was a marked characteristic of the inhibitor. It was found that the inhibition efficiency of the inhibitor depends on its concentration and chemical structure. In other words, the inhibition efficiency increases with the inhibitor concentration. The adsorption process obeyed Langmuir adsorption isotherm. Some thermodynamic parameters were determined from the effect of temperature on corrosion and inhibition processes. Potentiodynamic polarization measurements indicated that the drug was a mixed type inhibitor.
    Keywords: Penicillin G, Environment, friendly inhibitor, electrochemical impedance spectroscopy, potentiodynamic polarization
  • M. Moallem, O. Moini Jazani, M. Sohrabian, M. Aliakbari Pages 149-164
    The effect of alumina and tough nylon 66 on microparticles’ presence the mechanical and thermal properties of epoxy adhesives is assessed here. In order to distribute the adhesive formulation components, in a uniform manner a mechanical stirrer is applied. The effect a combined percentage of nylon66 at (20،30،40 pph) and alumina micro-particles 20 μ (50, 60, 70 pph) selected based on Taguchi experimental design method on the mechanical and thermal properties of the adhesives is assessed. The tensile test results reveal that the sample containing 20 pph nylon 66 and 70 pph alumina micro particles has the highest Young’s modulus and tensile strength compared to other examples designed in Taguchi Table and Sample containing 30 pph nylon66 and 50 pph alumina micro particles has the highest degree of toughness compared to other specimens. The results of TGA reveal that the sample with the highest mechanical properties has a degradation startup temperature and more residual coal than pure epoxy. All this is due to the presence of nylon 66 that contains active hydrogen which in turn can increase cross-linking and degree of networking high and ultimately a higher thermal stability than the epoxy matrix. The results obtained from the FT-IR test indicate that amide groups of nylon66 are capable of interaction with epoxy rings.
    Keywords: adhesive, epoxy, nylon66, alumina, mechanical properties
  • A. Sen, A. Bhowal, S. Datta Pages 165-172
    In this study, dyeing of two regenerated polyester fibers, poly-trimethylene terephthalate (PTT) and poly-lactic acid (PLA), with natural dyes were compared with that of poly-ethylene terephthalate (PET) fiber. Lac was used as the primary natural colorant while Catechu was chosen as a natural color that can also act as a biomordant. The effects of temperature, initial pH of dye bath and dyeing time on color strength of the fibers were examined with Lac and Lac-Catechu combination. The results indicated the regenerated polyester fibers to have more number of functional groups and less compact structure than PET, favoring dyeing under milder conditions. PTT exhibited higher color uptake than the other fibers. Also, with Lac and Catechu in the same dye bath, the color strength was found to increase for all fibers, indicating that Catechu acted as a biomordant. Response Surface Methodology (RSM) based on 23-Central Composite Design (CCD) was used for optimization of dyeing of PTT with Lac-Catechu combination. The optimal values for temperature, initial pH and dyeing time were found to be 127OC, 6 and 26 min, respectively. The quadratic regression model developed was found to be statistically significant using ANOVA, with R2-value and adjusted R2-value of 0.9708 and 0.9271 respectively.
    Keywords: Poly-trimethylene terephthalate, Poly-lactic acid, Lac, Catechu, Response surface methodology
  • M. Dodangeh, K. Gharanjig, M. Hosseinnezhad Pages 173-178
    The synthesis of a new yellow fluorescent 4-(2-methylamino)-ethyloxy-N-PAMAM-1,8-naphthalimide from zero generation has been described. The chemical structure of synthesized dendrimers was confirmed using FT-IR, 1HNMR and DSC techniques. The new materials are comprised of a 1,8-naphthalimide fluorophore having a substituent at C-4 position. The synthesized compounds (P2 and P3) were used for dyeing of wool fibers. The physical properties of the compounds (P2 andP3) were also investigated via fastness measurement.
    Keywords: 1, 8-naphthalimide, polyamidoamine dendrimer, Fluorescence, Dyeing, Fastness
  • H. Ahmadi Moghaddam Pages 179-191
    Dispersion, as the characteristic variation of refractive index with wavelength, is more pronounced, where the wavelength is approaching to the absorption band. In ultra-optical glasses, the nonlinear refractive index, concerning to the light intensity dependent phenomenon, becomes considerable. Here, two ultra-optical property glass systems; TiO2-Bi2O3-PbO (TBP) and Ga2O3-Bi2O3-PbO (GBP), which exhibited the most refractive indices, were selected. Their refractive index and dispersion measurements were done by `Minimum angle of deviation in a prism` method employing a spectrometer under different light spectra transmission. The corresponding nonlinear refractive indices of glasses were calculated by the Weber, et al., and Boling, et al., formulae and were analysed. The minimum refractive index in very long waves (infra-red), `n∞` and λs were estimated by `Kordes semi-empirical formula` and the dispersion curve fit method. Results suggested that the both glass systems could be good candidates for use in nonlinear optical applications, e.g. switches in all-optical telecommunications.
    Keywords: Refractive index, dispersion, ultra-optical, nonlinearity, all-optical