Publications

  • Roghayeh Jafari, Hamid Javaherian Naghash
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    ABSTRACT: The styrenesulfonyltrimethoxysilylpropyl thioether (STEP) was successfully synthesized as a silane containing co-monomer for preparation of environmentally friendly waterborne traffic-marking paint, which has fast dry, abrasion resistance, and long term durability. Then, the latex particles with a polyacrylate core and a polysilane shell were prepared by semi continuous seeded emulsion polymerization. Several key polymerization reaction conditions such as the STEP concentration, feeding sequence and the acrylates/silane ratio were detailedly discussed. Also the optimal condition to prepare stable core–shell particles was selected and a proper preparation process was established. The as-synthesized particles were characterized by TEM and laser light scattering. The clear core–shell structure of the particles could be observed through analysis TEM. In addition, the obtained results manifested that silanes had been grafted on the surface of the polyacrylate particles and they distributed on the outmost layer of the particles. Finally, the surface hydrophobicity of the film formed by latex particles was investigated by the water absorption ratio measurement. The results suggest the developed latex particle provided with a fair water-repellency property.
    Progress in Organic Coatings 08/2015; 85. DOI:10.1016/j.porgcoat.2015.03.009 · 2.30 Impact Factor
  • Ahmad R. Taat, Hamideh Akbari, Hamid Javaherian Naghash
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    ABSTRACT: Three novel allyl-containing alkoxysilanes, allyl 3-(trimethoxysilyl) propyl ether (ATSE), allyl 3-(trimethoxysilyl) propyl thioether (ATST) and 4-(trimethoxysilyl) propyloxy-4-methacryloxydiphenyl sulfone (TSMS) were prepared by the condensation reaction of allyl alcohol with chloropropyltrimethoxysilane (CPTS), allyl chloride with (3-mercaptopropyl)-trimethoxysilane (MPTS) and methacrylic acid with bis (4-hydroxyphenyl) sulfone and also with CPTS, respectively. Also acrylic groups were hybrid with alkyds via free radical chemistry. The alkyd comprised soybean oil, glycerol and phthalic anhydride. To closely model acrylated-alkyds, a mixture of acrylic monomers were copolymerized with the alkyd including: methyl methacrylate (MMA), butyl acrylate (BA), methacrylic acid (MAA), and alkoxysilanes ATSE, ATST and/or MPTS.
    Progress in Organic Coatings 07/2015; 84. DOI:10.1016/j.porgcoat.2015.02.004 · 2.30 Impact Factor
  • Mozhgan Arab, Hamid Javaherian Naghash
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    ABSTRACT: Alkoxy and methacryloxy propyl end caped polydimethylsiloxane (AMP-PDMS) was successfully synthesized. The preparation included four steps, which are hydrolysis, hydroxyl formation, alkylation and alkoxylation. Then, the latex particles with a polyacrylate core and a polydimethylsiloxane shell via AMP-PDMS as the space arm to link the core and shell have been prepared by semi continuous seeded emulsion polymerization. And several key polymerization reaction conditions such as the surfactant content, AMP-PDMS concentration, feeding sequence and the acrylates/siloxanes ratio were detailedly discussed. Also the optimal condition to prepare stable core/shell particles was selected and a proper preparation process has been established. The as-synthesized particles were characterized by TEM and laser light scattering. The clear core/shell structure of the particles could be observed through analysis TEM. In addition, the obtained results manifested that siloxanes had been grafted on the surface of the polyacrylate particles and they distributed on the outmost layer of the particles. Finally, the surface hydrophobicity of the film formed by latex particles was investigated by the water absorption ratio measurement. The results indicated the developed latex particle provided with a fair water-repellency property.
    Progress in Organic Coatings 05/2015; 82. DOI:10.1016/j.porgcoat.2015.01.008 · 2.30 Impact Factor
  • Hamid Javaherian Naghash, Zahra Asgari
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    ABSTRACT: The objective of the present work was the development and characterization of two novel silane and imide ring containing vinylic macromonomers, N-(4-trimethylsiloxyphenyl) maleimide (TSPM) and N-(4-trimethylsiloxyphenyl) pyromellitylimido-N′-phenylacrylate (TSPA), and their emulsion copolymerization in the presence of styrene (St) and butyl acrylate (BA) monomers. The purity and structural conformation of TSPM and TSPA were ascertained from elemental analysis, FT-IR and NMR spectral studies. Thermal properties of the copolymers were studied by using differential scanning calorimetry (DSC) and thermo gravimetric analysis (TGA). The morphology of copolymers was investigated by transition electron microscopy (TEM) and then the effect of TSPM and TSPA concentrations on the water absorption ratio was examined. The results show that compared with the film based on the pure P (St-co-BA) copolymers, the water-resistance of the emulsion films made of TSPM and/or TSPA was greatly improved.
    Progress in Organic Coatings 02/2013; 76(s 2–3):318–327. DOI:10.1016/j.porgcoat.2012.09.008 · 2.30 Impact Factor
  • Hamid Javaherian Naghash, Bahman Johari, Fariba Rezaei, Monireh Mohammadsalehi
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    ABSTRACT: The objective of the present work was the synthesis and characterization of a methacrylate-containing siliconized epoxy hybrid monomer and its emulsion copolymerization in the presence of styrene/butyl acrylate monomers. The purity and structural conformation of this monomer were ascertained from FTIR and NMR spectral studies. Thermal properties of the copolymers were investigated by using differential scanning calorimetry and thermal gravimetric analysis. The morphology of copolymers was investigated by scanning electron microscopy and then the effect of siliconized epoxy hybrid monomer concentration on the water absorption ratio was examined. The results show that the water-resistance of the terpolymer films was higher compared with the films of styrene-co-butyl acrylate copolymer.
    Polymer Science Series B 11/2012; 54(11-12). DOI:10.1134/S1560090412100089 · 0.63 Impact Factor
  • Hamid Javaherian Naghash
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    ABSTRACT: Copolymer such as poly(styrene-co-butylacrylate-co-hydroxyethyl methacrylate) p (St-BA-HEMA) was prepared via free radical emulsion polymerization method. The resulting copolymer was converted to silicone secondary crosslinked interpenetrating polymer network (IPN) by condensation reaction with tetraethyl orthosilicate (TEOS). The obtained copolymers were characterized by using Fourier transform infrared spectroscopy (FTIR). Thermal properties of the copolymers were studied by using thermogravimetric analysis (TGA) and differential scanning calorimetry (DSC). Optical microscopy (OM) is used for studying the morphology, and then the effects of silicone concentrations, the reflux time, and composition on the phase morphology of P (St-BA-HEMA)-SiO2 IPNs were discussed. The broadening of the transition region was observed with the prolongation of the reflux time, and the tendency for aggregation of silicone on the surface was observed with Teflon as substrate plate. However, an optically transparent film was easily achieved at higher temperature due to the chemical crosslink and physical entanglement between the two phases of P (St-BA-HEMA)-SiO2. © 2011 Wiley Periodicals, Inc. J Appl Polym Sci, 2011
    Journal of Applied Polymer Science 10/2011; 122(1):722 - 728. DOI:10.1002/app.34030 · 1.64 Impact Factor
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    Hamid Javaherian Naghash, Baharak Abili
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    ABSTRACT: A new silicone containing allylic monomer, allyl 3-(triethoxysilyl) propyl carbamate (ATESPC), based on (3-isocyanatopropyl) triethoxysilane (ICPTES) and allyl alcohol (AAL) has been synthesized for formulation of waterborne polyurethane (WPU). Then a series of new siliconized WPU, vinyl acetate (VAc)/2-ethylhexylacrylate (2-EHA) and ATESPC hybrid latexes P(VAc-2-EHA)/PU/Si have been successfully synthesized by the emulsion copolymerization in the presence of a WPU dispersion by using potassium persulfate (KPS) as an initiator. The WPU dispersion has been synthesized by a polyaddition reaction of hexamethylene diisocyanate (HMDI), on polypropylene glycol (PPG-1000) and dimethylol propionic acid (DMPA) as chain extender. The NCO chain ends being reacted with water (which act as a further chain extender producing some urea bonds). Films were obtained for different hybrid latexes of various compositions. The resulted monomer characterized by Fourier transformer infrared spectroscopy (FTIR), proton (1H NMR), and carbon (13C NMR) nuclear magnetic resonance spectroscopes, respectively. The copolymers also were characterized by using Fourier transform infrared spectroscopy (FT-IR). Thermal properties of the copolymers were studied by using thermogravimetric analysis (TGA) and dynamic mechanical thermal analysis (DMTA). The morphology of copolymers was investigated by scanning electron microscopy (SEM) and then the effects of silicone concentrations on the water absorption ratio, was examined.
    Polymer Korea 12/2010; 69(4):486-494. DOI:10.1016/j.porgcoat.2010.09.003 · 0.43 Impact Factor
  • ChemInform 07/2010; 41(30). DOI:10.1002/chin.201030037
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    ABSTRACT: ChemInform is a weekly Abstracting Service, delivering concise information at a glance that was extracted from about 100 leading journals. To access a ChemInform Abstract of an article which was published elsewhere, please select a “Full Text” option. The original article is trackable via the “References” option.
    ChemInform 04/2010; 41(16). DOI:10.1002/chin.201016096
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    ABSTRACT: A silane-containing diamine, bis(p-aminophenoxy) diphenylsilane (BADPS), was prepared by the condensation of p-aminophenol with dichlorodiphenyl silane in the presence of triethylamine. Then, BADPS was condensed with 4,4-azobis(4-cyanopentanoyl chloride) to prepare macroazoinitiators containing silane units (Si–MAIs). A series of poly(methyl methacrylate) gels containing silane were derived by the solution free-radical crosslinking copolymerization of methyl methacrylate and ethylene glycol dimethacrylate monomers initiated by these macroazoinitiators at a total monomer concentration of 6 mol/L and 80°C. Si–MAIs were characterized with 1H-NMR and 13C-NMR spectroscopy, and the structural characteristics of the gels were also examined. © 2009 Wiley Periodicals, Inc. J Appl Polym Sci, 2010
    Journal of Applied Polymer Science 04/2010; 116(1):382 - 393. DOI:10.1002/app.30856 · 1.64 Impact Factor
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    ABSTRACT: Some metal hydrogen sulfates were used as acid catalysts in the N-acylation of different sulfonamides using carboxylic acid chlorides and anhydrides as acylating agents under both heterogeneous and solvent-free conditions. Al(HSO4)3 and Zr(HSO4)4 were found to have the highest activity and catalyze the reactions efficiently to furnish the primary N-acyl sulfonamides (RCONHSO2R′), secondary N-acylsulfonamides (RCONR″SO2R′) and bis-N-acylsulfonamnides [RCO(SO2R′)N-R″-N(SO2R′)COR] in good to high yield. The mild reaction conditions, inexpensive and low toxicity of catalysts and easy work-up procedure make this method attractive.
    ChemInform 01/2010; 41(3). DOI:10.1002/chin.201003076
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    ABSTRACT: TiO2-ZrO2 (1/1)-surf with Ti and Zr molar ratio of 1/1 was prepared with surfactant through a sol-gel method. The optimum experimental condition was investigated for nitration of salicylic acid. Then, a number of nitration reactions were carried out with a variety of aromatic compounds in the optimum condition. The 25 wt% H3PO4/TiO2-ZrO2 (1/1)-surf catalyst showed good selectivity and yield in a short time for the nitration of salicylic acid and some other aromatic compounds.
    Chinese Journal of Chemistry 01/2010; 28(3):397-403. DOI:10.1002/cjoc.201090086 · 1.04 Impact Factor
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    ABSTRACT: ChemInform is a weekly Abstracting Service, delivering concise information at a glance that was extracted from about 200 leading journals. To access a ChemInform Abstract of an article which was published elsewhere, please select a “Full Text” option. The original article is trackable via the “References” option.
    ChemInform 11/2009; 40(45). DOI:10.1002/chin.200945134
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    ABSTRACT: Somemetal hydrogen sulfates were used as acid catalysts in the N-acylation of different sulfonamides using carboxylic acid chlorides and anhydrides as acylating agents under both heterogeneous and solvent-free conditions. Al(HSO4)3 and Zr(HSO4)4 were found to have the highest activity and catalyze the reactions effi- ciently to furnish the primary N-acyl sulfonamides (RCONHSO2R0), secondary N-acylsulfonamides (RCONR00 SO2R0) and bis-N-acylsulfonamnides [RCO(SO2R0)N-R00-N(SO2R0 )COR] in good to high yield. The mild reaction conditions, inexpensive and lowtoxicity of catalysts and easywork-up proceduremake thismethod attractive.
    Tetrahedron 07/2009; 65(36-65):7696-7705. DOI:10.1016/j.tet.2009.06.112 · 2.82 Impact Factor
  • Hamid Javaherian Naghash, Ahmad Reza Massah, Masoud Arman
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    ABSTRACT: Silicone secondary cross-linked interpenetrating polymer networks (IPNs) of poly(vinylacetate-co-hydroxyethyl methacrylate) (PVAc-HEMA) and SiO2 were prepared by free radical polymerization and condensation methods. The resulting copolymers were characterized by using Fourier transform infrared spectroscopy (FTIR). Thermal properties of the copolymers were studied by using thermogravimetric analysis (TGA) and differential scanning calorimetry (DSC). The morphology of copolymers was also investigated by optical microscopy (OM) and then the effects of silicone concentrations, the reflux time, and composition on the phase morphology of the IPNs of PVAc-HEMA/SiO2 were discussed. The broadening of the transition region was observed with the increase of the prolongation of the reflux time and the tendency of the aggregation of silicon in the surface was also observed with Teflon as a substrate plate. However, an optically transparent film was easily achieved at higher temperature due to the chemical cross-link and physical entanglement between the two phases of PVAc-HEMA and SiO2.
    Progress in Organic Coatings 06/2009; 65(2):275–280. DOI:10.1016/j.porgcoat.2008.12.005 · 2.30 Impact Factor
  • Hamid Javaherian Naghash, Akram Karimzadeh, Ahmad Reza Massah
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    ABSTRACT: Styrene (St)/butyl acrylate (BA) copolymers were prepared by adding triethoxyvinylsilane (TEVS), trimethoxyvinylsilane (TMVS), and triphenylvinylsilane (TPVS), each one through emulsion copolymerization. The polymerization was performed with methacrylic acid and auxiliary agents at 80°C in the presence of potassium peroxodisulfate as the initiator. Nonylphenol ethylene oxide-40 units (NP-40) and sodium lauryl sulfoacetate were used as nonionic and anionic emulsifiers, respectively. The resulting copolymers were characterized by using Fourier transform infrared spectroscopy. Thermal properties of the copolymers were studied by using thermogravimetric analysis and differential scanning calorimetry. The morphology of copolymers was also investigated by optical microscopy, and then the effects of silicone kinds and concentrations on the properties of the St/BA emulsion copolymers were discussed. The obtained copolymers have high solid content (50 %) and can be used in emulsion paints as a binder. The comparison of three different vinyl silanes indicates that the TEVS influences on the copolymer properties more than the others. The calculations of monomer conversion and monomer conversion versus time histories indicate that by increasing the silicone concentration, the polymerization rate decreases. © 2009 Wiley Periodicals, Inc. J Appl Polym Sci, 2009
    Journal of Applied Polymer Science 04/2009; 112(2):1037 - 1044. DOI:10.1002/app.29555 · 1.64 Impact Factor
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    ABSTRACT: The treatment of indole with structurally diverse aldehydes in the presence of catalytic amount of inorganic-supported polyoxometalates, heterogeneous, reusable and efficient catalysts at room temperature gave the corresponding bis-indolylmethanes in excellent yields and shorter reaction times under solvent-free conditions. The catalyst can be reused for several times, but it will be less active. © 2009 Wiley Periodicals, Inc. Heteroatom Chem 20:325–331, 2009; Published online in Wiley InterScience (www.interscience.wiley.com). DOI 10.1002/hc.20554
    Heteroatom Chemistry 01/2009; 20(6):325-331. DOI:10.1002/hc.20554 · 1.26 Impact Factor
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    ABSTRACT: Rapid and efficient condensation reactions of o-phenylenediamine and o-aminothiophenol with various aldehydes were carried out using tungstophosphoric acid impregnated zirconium phosphate in solvent-free conditions to afford the corresponding 2-substituted arylbenzimidazole and arylbenzothiazole derivatives in good to excellent yields. This procedure constitutes a simple and practical green synthetic method for 2-arylbenzimidazoles and 2-arylbenzothiazoles and their structural analogs. Furthermore, the catalyst can be reused for several times but it will be less active. © 2009 Wiley Periodicals, Inc. Heteroatom Chem 20:202–207, 2009; Published online in Wiley InterScience (www.interscience.wiley.com). DOI 10.1002/hc.20534
    Heteroatom Chemistry 01/2009; 20(4):202-207. DOI:10.1002/hc.20534 · 1.26 Impact Factor
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    ABSTRACT: Sulfonamides were converted to the corresponding N‐acyl sulfonamides with carboxylic acid chlorides and anhydrides in the presence of silica chloride. All reactions were performed in both heterogeneous and solvent‐free conditions. This method provides the N‐acyl sulfonamides products in good to high yield and purity.
    Synthetic Communications 06/2008; 38(2):265-273. DOI:10.1080/00397910701750185 · 0.98 Impact Factor
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    ABSTRACT: ChemInform is a weekly Abstracting Service, delivering concise information at a glance that was extracted from about 200 leading journals. To access a ChemInform Abstract of an article which was published elsewhere, please select a “Full Text” option. The original article is trackable via the “References” option.
    ChemInform 05/2008; 39(21). DOI:10.1002/chin.200821080

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