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Electrochemical and anticorrosion behavior of functionalized graphite nanoplatelets epoxy coating
Somayeh Mohammadi,Faramarz Afshar Taromi,Homeira Shariatpanahi,Jaber Neshati,MAHMOUD HEMMATI 한국공업화학회 2014 Journal of Industrial and Engineering Chemistry Vol.20 No.6
Functionalized graphite nanoplatelets (FGNP) were used as efficient and compatible nano-particles toproduce homogenous epoxy nano-coating with impressive anticorrosion behavior for carbon steel. Thecharacterizations of the nano-particle and nano-coating were carried out by SEM, FT-IR, XRD, TEM andpull-off test. Fine distribution of nano-particles in the cured nano-coating with particle sizes of 20–40 nm was obtained. Electrochemical experiments, salt spray and X-ray fluorescence showed that thenano-coatings protect the metal substrate by formation of passive layer and physical barriercharacteristics. Three samples (0.25%, 0.5% and 1%) of FGNP-epoxy coatings were prepared that 0.5%showed better anticorrosion properties.
Anomalous Rheological Behavior of Dendritic Nanoparticle/Linear Polymer Nanocomposites
Goldansaz, Hadi,Goharpey, Fatemeh,Afshar-Taromi, Faramarz,Kim, Il,Stadler, Florian J.,van Ruymbeke, Evelyne,Karimkhani, Vahid American Chemical Society 2015 Macromolecules Vol.48 No.10
<P>We investigated the effects of soft dendritic polyethylene (dPE) nanoparticles on the rheological properties of a linear polystyrene (PS) matrix. The viscosity of PS–dPE nanocomposites is found to exhibit nonmonotonic dependence on the dPE concentration. In particular, with the addition of 1% dPE nanoparticles, we already observe more than 1 order of magnitude reduction in viscosity. The minimum viscosity was observed at 5% nanoparticles. At dPE concentrations higher than 5%, nanocomposite viscosity increases by addition of nanoparticles, yet it remains below the viscosity of PS. Addition of nanoparticles not only influences the terminal relaxation times of the nanocomposites but also affects their whole relaxation spectra. The viscosity of PS–dPE nanocomposites at high temperature is found to reversibly evolve with time, which proves the existence of supramolecular interactions between the PS matrix and the nanoparticles. Atomic force microscopy confirms that dPE nanoparticles are well distributed in the PS matrix, though each component of the nanocomposite exhibits its own glass transition. While the origin of viscosity reduction remains unknown, it cannot be attributed to confinement, free volume effect, change of entanglement density, surface slippage, shear banding, or particle induced shear thinning.</P><P><B>Graphic Abstract</B> <IMG SRC='http://pubs.acs.org/appl/literatum/publisher/achs/journals/content/mamobx/2015/mamobx.2015.48.issue-10/acs.macromol.5b00390/production/images/medium/ma-2015-003905_0007.gif'></P><P><A href='http://pubs.acs.org/doi/suppl/10.1021/ma5b00390'>ACS Electronic Supporting Info</A></P>
Hadi Shirali,Mehdi Rafizadeh,Faramarz Afshar Taromi 한국고분자학회 2015 Macromolecular Research Vol.23 No.8
A series of novel random copolymers of poly(butylene succinate-co-ethylene terephthalate) were synthesized and characterized in terms of thermal and mechanical properties, crystallinity and biodegradability. The composition and microstructure of the prepared copolyesters were characterized by 1H NMR and 13C NMR, respectively. It was seen that the PBS sequence length decreases with ethylene terephthalate content. All copolymers are semi-crystalline and crystallinity and crystallite size decrease slightly with the comonomer content up to 10%, but the introduction of 20% comonomer leads to decrease the crystallinity up to 29%. The melting temperature of copolyesters decreases with the comonomer content according to the Baur’s equation that indicates only PBS blocks crystallize and crystallite size is decreased with the comonomer content. It was also investigated that the elastic modulus also decreases slightly with the comonomer content. However, the elongation at break increases by 500% due to the decrease in crystallite size and crystallinity. Incorporating non-biodegradable aromatic comonomer has a little effect on copolyester degradability because of the randomness and lower crystallite size.
Hadi Shirali,Mehdi Rafizadeh,Faramarz Afshar Taromi 한국고분자학회 2016 Macromolecular Research Vol.24 No.10
New nanocomposites of poly(butylene succinate-co-ethylene terephthalate)/nano hydroxyapatite were synthesized using two-step in situ polycondensation. The composition, microstructure, morphology and dispersion of nanoparticles in the nanocomposites were studied using proton nuclear magnetic resonance (1H NMR), Fourier transform infrared spectroscopy (FTIR), scanning electron microscopy (SEM) and transmission electron microscopy (TEM). It was found that presence of nano hydroxyapatite catalyzes the reaction and there is a chemical bond between nanoparticles and polymer which leads to a good particle dispersion but it doesn’t affect molecular sequence length. Nanocomposites’ thermal properties evaluated by differential scanning calorimetry (DSC) and X-ray diffraction (XRD), showed that crystallinity and crystallite size slightly decrease with the nanoparticles weight fraction. Moreover, the elastic modulus slightly increases and tensile strength and elongation at break decrease with the nanoparticles weight fraction according to dynamic mechanical thermal analysis (DMTA) and tensile analysis. Introducing nano hydroxyapatite increases the hydrolytic degradability dramatically because of the presence of hydrophilic nanoparticle and lower crystallite size.
Zahra Moridi Mahdieh,Shahla Shekarriz,Faramarz Afshar Taromi 한국섬유공학회 2021 Fibers and polymers Vol.22 No.1
In situ synthesis coating method of textile fabric is an efficient strategy to reduce the time and energies incomparison with ex situ synthesis methods. A facile in situ synthesis method was used to make TiO2-Ag nanoparticles (NPs)coated fabric and compared with a traditional ex situ synthesis method by a photo-reduction approach. The effect of silverconcentration was assessed for both methods. The corona discharge treatment was used to increase the adhesion of thecoating to the surface of the fabric. The FESEM and map showed more even distribution of the TiO2-Ag NPs coated fabricfor in situ method in comparison with ex situ. DLS analysis was employed for determining the average particle size of theNPs colloids and show the fewer colloids average size of the in situ method than ex situ. The elemental analysis of the EDSand ICP showed a significant efficiency of the in situ synthesis method for silver nitrate reduction that leads to an increase inthe nanoparticles concentration on the surface. Self-cleaning and antibacterial activity have been increased by in situsynthesis coating method in comparison with ex situ method. The enhancement of silver nitrate concentration led to aconsiderable increase in silver content for in situ method in comparison with ex situ method. However, the self-cleaningimprovement showed a critical concentration at silver nitrate of 0.005 w/v%. The wash durability of the coated fabricsshowed a significant increase in durability for in situ synthesis. The measurement of the mechanical strength of the fabricsshowed no significant change with both methods of coating.