Ali Akbar Entezami

University of Tabriz

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Bakhshali Massoumi

Payame Noor University

Babak Ghanbarzadeh

University of Tabriz

Mohammad Reza Nabid

Shahid Beheshti University

Mojtaba Abbasian

Payame Noor University

Massoumeh Bagheri

Azarbaijan Shahid Madani University

Marziyeh Fathi

Tabriz University of Medical Sciences

Sohrab Rahmani

Mashhad University of Medical Sciences

Soodabeh Davaran

Tabriz University of Medical Sciences

Hassan Namazi

University of Tabriz

Homa Gheybi

Sahand University of Technology

Cooperative Institutions

University of Tabriz

Tabriz University of Medical Sciences

Payame Noor University

Iran Polymer and Petrochemical Institute

Tarbiat Modares University

University of Tehran

Faculty (United Kingdom)

Shahid Beheshti University

Amirkabir University of Technology

Urmia University

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Synthesis and characterization of liquid crystalline diethanolamine‐based dendrimers

Polymers for Advanced Technologies (2009)

Khadijeh Didehban Hassan Namazi Ali Akbar Entezami

Abstract Three generations of diethanolamine‐based dendrimers containing nitroazobenzene were synthesized. Firstly, G 1 was prepared by the diazotation of p ‐nitroaniline, and then the obtained salts reacted with n ‐phenyl‐2,2′‐iminodiethanol. The reaction of hydroxyl groups of diethanolamine of G 1 and G 2 with acryloyl chloride resulted in G 1.5 and G 2.5. Then, G 2 and G 3 were synthesized using Michael addition of amino group of diethanolamine and G 1.5 and G 2.5. The Williamson etherification and azo‐reaction were employed in the preparation of the mesogenic unit 4‐[4‐(6‐bromohexyloxy)phenylazo]nitrobenzene (N 6 ‐Br). Secondly, mesogen‐functionalized dendrimers were synthesized via the coupling of the hydroxyl group of G 1 , G 2 , G 3 , and bromine from mesogenic units (N 6 ‐Br). The polarizing optical microscopy (POM) and differential scanning calorimetry (DSC) were used for the investigation of the liquid crystalline properties of the mesogen‐functionalized dendrimers. The structures of obtained compounds were investigated using common spectroscopy methods and CHN analysis. Copyright © 2009 John Wiley & Sons, Ltd.

Mesogen

Diethanolamine

Acryloyl chloride

10.1002/pat.1388

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Citations (8)

The effect of grafted poly(ethylene glycol monomethyl ether) on particle size and viscosity of aqueous polyurethane dispersions

Colloids and Surfaces A Physicochemical and Engineering Aspects (2005)

S M Seyed Mohaghegh Mehdi Barikani Ali Akbar Entezami

Graft polymer

10.1016/j.colsurfa.2005.10.023

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Citations (50)

New polymer systems based on polyethylene glycol: synthesis, characterization, and study of the solubility behavior

Polymer Bulletin (2019)

Azar Ghaffari Malihe Pooresmaeil Hassan Namazi Ali Akbar Entezami

Tetrahydrofuran

10.1007/s00289-019-03041-1

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Citations (2)

Poly(hetero)arylene Vinylenes, Synthesis Via Soluble Precursor Polymers, Characterization, Mechanism and Application : A Review

Ali Akbar Entezami Massoumeh Bagheri

Poly(arylenevinylene)s are considered to be promising candidates for electrical andlor optical materials . Most of these polymers are neither fusible nor soluble in common solvents, making it difficult to process them into shaped articles . The synthetic procedures have mostly involved the preparation of a precursor poly- mer which is processible, usually in solution, and which can then be converted into the desired poly(arylenevinylene) ; alternatively, these conjugated polymers can be rendered soluble and thereforeprocessiblein organic solvents by attaching large lipophilic groups to the arylenevinylene moiety . The precursor route involves produdng a polymer in which the arylene units are connected by ethylene units . The saturated units contain a group which not only solubilizes the macromolecule and allows processing, but which can under suitable condi- tions also act as a leaving group, thus affording the saturated vinylene units of a fully conjugated polymer . In this article the synthesis ofpoly(hetero)arylene vinylenes via a soluble precursor polymers, characteristics, mechanism of poly- merization and their application together with some properties are reviewed.

Arylene

Moiety

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Citations (1)

Studies of Thermal and Electrical Conductivity Behaviours of Polyaniline and Polypyrrole Blends with Polyvinyl Acetate, Polystyrene and Polyvinyl Chloride

Seyed Hossein Hosseini Ali Akbar Entezami

hysical properties and thermal behaviours of polymers vary by molecular weight or stereoisomers. These properties also change in the presence of polymeric and nonpolymeric additives. Conductive polymers are insoluble in original organic solvents and their processibility are limited. In this research, the processible conducting polymers are synthesized and their electrical properties and thermal behaviour are studied. The blends of polyvinyl acetate (PVAc), polystyrene (PS) and polyvinyl chloride (PVC) with polypyrrole (PPy) and polyaniline (PANi) are prepared. On the other hand, the percentages of compounds of these blends for suitable electrical properties, solubility and processability are optimized. All the samples were prepared in the smooth form and thin film. A four-point probe method is adopted to examine the electrical DC conductivity. It is found that the conductivity of the blends is decreased but their processibility and solubility are increased. Thermal stability of polypyrrole and polyaniline blends were investigated by scanning thermal analysis (STA), differential scanning calorimetry (DSC) and thermal gravimetrical analysis (TGA). As it is evident from the results, the prepared blends are much more stable compared with polypyrrole, polyaniline and host polymers.

Polyvinyl acetate

Polypyrrole

Polystyrene

Thermal Stability

Source

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Citations (13)

Polymerisation de l'isoprene en milieu alcool allylique en presence de nitrate de rhodium (III) dihydrate

European Polymer Journal (1977)

Ali Akbar Entezami A. Deluzarche B. Kaempf François Schué

10.1016/0014-3057(77)90116-1

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Citations (3)

Preparation and characterization of polyaniline blends with polyvinyl acetate, polystyrene and polyvinyl chloride for toxic gas sensors

Polymers for Advanced Technologies (2001)

Seyed Hossein Hosseini Ali Akbar Entezami

Abstract The conditions of processing and gas sensing of polyaniline (PANi) blends with polyvinyl acetate (PVAc), polystyrene (PS) and polyvinyl chloride (PVC) were investigated. Flexible, free‐standing and stretchable films of various blends compositions were obtained by casting. The mechanisms of the conducting blends response to a selection of gases and vapours were investigated using two techniques: measurement of conductance and mass changes using a four‐point probe method and X‐ray fluorescence (XRF) device, respectively. These responses to toxic gases and vapours are better explained by polymer blends than homopolymers. Prepared films were exposed to hydrogen halides, hydrogen cyanide, halogens, monochloroacetic acid (MCAA), 1‐3‐5 trichloromethyl benzene (TCMB), methylbenzyl bromide (MBB), bromoacetone (BA) and cyanogen bromide (CB). The changes in conductivity of various polymer frequently observed are partly due to one stage in the two‐stage sorption perhaps involving the swelling of the polymer and then diffusion of gases into polymer chains. The swelling of polymers is a slow process, therefore, we have pre‐swelled polymer films which tend to decrease the response times of blends in respect to gases. The structures of the blends are examined by STA (TGA & DSC) and SEM studies. Copyright © 2001 John Wiley & Sons, Ltd.

Polyvinyl acetate

Polystyrene

Vapours

Polyvinyl Alcohol

10.1002/pat.107

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Citations (55)

Supported zirconocene catalyst for preventing reactor fouling in ethylene polymerization

Polymer International (2005)

Ali Akbar Entezami Peyman Najafi Moghadam

Abstract The commercial interest of metallocene complexes for olefin polymerization has led to additional efforts to prepare suitable metallocene complexes efficiently and economically. Ethylene polymerization was carried out with a series of heterogeneous catalysts which were prepared in various Zr/silica ratios by immobilization of Ind 2 ZrCl 2 preactivated with methylaluminoxane (MAO) on silica. This method to form the catalyst system resulted in a polymerization catalyst with reduced fouling tendencies and improved reactor operability. Polymerization of ethylene was conducted in Buchi reactors in a slurry phase under mild pressure. Some of the physical properties of the obtained polymers were also determined. Copyright © 2005 Society of Chemical Industry

Methylaluminoxane

Post-metallocene catalyst

Coordination polymerization

10.1002/pi.1851

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Citations (13)

Synthesis of fast response crosslinked PVA-g-NIPAAm nanohydrogels by very low radiation dose in dilute aqueous solution

Radiation Physics and Chemistry (2013)

Marziyeh Fathi Alireza Farajollahi Ali Akbar Entezami

Thermogravimetric analysis

Vinyl alcohol

10.1016/j.radphyschem.2013.02.005