Nicoleta Doriana Stanciu

Romanian Academy

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Mircea Teodorescu

University of Bucharest

Dumitru Mircea Vuluga

Romanian Academy

Ana‐Maria Albu

Universitatea Națională de Știință și Tehnologie Politehnica București

Paul Octavian Stănescu

University of Bucharest

Dănuţ‐Ionel Văireanu

Universitatea Națională de Știință și Tehnologie Politehnica București

Mihai Bogdan Cioaca

Universitatea Națională de Știință și Tehnologie Politehnica București

ȘI

Ștefan Ioan Voicu

Universitatea Națională de Știință și Tehnologie Politehnica București

Mihaela Mocioi

Universitatea Națională de Știință și Tehnologie Politehnica București

Constantin Drǎghici

Romanian Academy

A.C. Nechifor

Universitatea Națională de Știință și Tehnologie Politehnica București

Cooperative Institutions

Universitatea Națională de Știință și Tehnologie Politehnica București

University of Bucharest

Romanian Academy

Institutul Naţional de Cercetare Dezvoltare pentru Chimie si Petrochimie

Academy of Romanian Scientists

Laboratoire de Chimie Organique

Centre National de la Recherche Scientifique

Gheorghe Asachi Technical University of Iași

University of Science and Technology

National Institute of Research and Development for Electrochemistry and Condensed

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Polymerization Process-Method for Control of Crystal Nucleation of Calcium Carbonate

Molecular Crystals and Liquid Crystals (2008)

Ana‐Maria Albu Nicoleta Doriana Stanciu Mihaela Mocioi

We report based of the new concept for controlling crystal polymorphs of CaCO3, entitled “latent inductor method”, [10 Naka , K. , Keum , D.-K. , Tanaka , Y. , & Chujo , Y. ( 2000 ). Chem. Comm. , 2000 , 1537 – 1538 .[Crossref] , [Google Scholar]] the results obtained by developing the crystallization in the same time with polymerizations process of methyl methacrylate. The crystalline form of product is discussed reported to analytical results obtained by FT-IR spectroscopy, X-ray, SEM. We discuss, in the same time, the particularity of polymeric assistant of crystallization process.

Crystal (programming language)

10.1080/15421400801904450

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Novel hydrogels from diepoxy‐terminated poly(ethylene glycol)s and aliphatic primary diamines: synthesis and equilibrium swelling studies

Polymers for Advanced Technologies (2009)

Mircea Teodorescu Bogdan Cursaru Paul Octavian Stănescu Constantin Drǎghici Nicoleta Doriana Stanciu

Abstract New hydrogels were prepared from diepoxy‐terminated poly(ethylene glycol)s of approximate molecular weights 600, 1000, 2000, and 4000 Da and aliphatic primary diamines with different numbers of carbon atoms (ethylenediamine, 1,4‐diaminobutane, hexamethylenediamine, 1,8‐octanediamine, 1,10‐decanediamine, 1,12‐dodecanediamine), in water or ethanol–water mixture, depending on the amine solubility. The swelling behavior of these gels was tested in distilled water/aqueous solution at constant temperature and the equilibrium swelling degree (ESD) was determined for structurally different hydrogels and under various environmental conditions. It was shown that ESD was influenced by the molecular weight of PEG oligomers, amine/epoxy groups mole ratio, amine chain length, temperature, pH, and concentration of salts present in the swelling medium. Higher ESDs were obtained for either longer‐chain PEGs, non‐stoichiometric amine/epoxy groups ratio, shorter amines, acidic pH, lower temperatures, or in the absence of salts. Copyright © 2009 John Wiley & Sons, Ltd.

Ethylene diamine

Hexamethylenediamine

10.1002/pat.1330

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Citations (19)

Polysulfone- doped polyaniline composite membranes. synthesis and electrochemical characteristics

International Semiconductor Conference (2008)

Ștefan Ioan Voicu Nicoleta Doriana Stanciu A.C. Nechifor Dănuţ‐Ionel Văireanu Gheorghe Nechifor

In order to combine the advantages of polysulfone (PSf) as a membrane material to that of polyaniline as a conductive polymer, one has attempted to obtain novel polysulfone-polyaniline composite membranes by a newly improved technique comparing to the existing ones. The strong point of this technique consists in a phase inversion by immersion precipitation accompanying by chemical reaction followed by the activation of polyaniline with sulfonated beta-cyclodextrine. The above synthesized membranes were structurally characterized using Scanning Electron Microscopy, FT-IR spectroscopy, thermal analysis. The ionic conductivity and electrochemical characteristics were also determined by Electrochemical Impedance Spectroscopy.

Polysulfone

Phase inversion

10.1109/smicnd.2008.4703392

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Synthesis and Characterization of Composites from Layered Silicates and Homo- and Copolymers of 2-Hydroxyethyl Methacrylate and P-Chloromethyl Styrene Obtained by In Situ Radical (Co)polymerization

Molecular Crystals and Liquid Crystals (2010)

Nicoleta Doriana Stanciu Valentin Victor Jerca Dumitru Mircea Vuluga Paul Octavian Stănescu Anton Ficai

The hybrids 2-hydroxyethyl methacrylate – chlorometylstyrene – modified montmorillonite were synthesized by means of “in-situ” radical (co)polymerization. The composites were analysed by thermal analysis (DSC-TGA-MS), Fourier-Transform Infrared Spectroscopy (FT-IR), nuclear magnetic resonance (1H-NMR), X-ray diffraction, and scanning electron microscopy (SEM). The influence of the polymerization conditions and compositions on the thermal stability and morphology of the obtained composites is discussed.

Thermal Stability

In situ polymerization

10.1080/15421401003722906

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Compozite polimer-organice şi polimer-anorganice obţinute prin polimerizare radicalică „in situ”

Nicoleta Doriana Stanciu

The synthesis of organic-polymer or inorganic-polymer composites was a real challenge within the last decades due to the difficulty of optimally dispersing the reinforcing agent into the polymeric matrix. A method to solve this problem is the situ The first part of the experimental study deals with the synthesis of the polymer-cellulose composites. Cellulose-containing composites based on copolymers of acrylic acid with styrene, 4-chloro-methyl-styrene and maleic anhydride or based on copolymers of methacrylic acid with styrene and 4-chloro-methyl-styrene were prepared for proton conducting membranes. Next, cellulose composites with maleic anhydride – dicyclopentadiene copolymer matrix were obtained by “in situ” free-radical polymerization. The syntheses were carried out in two different solvents: toluene and dioxane, aiming to determine their influence upon both the polymerization process and properties of the resulting materials. To the best of our knowledge, studies concerning the preparation of this composite have not been published in the literature until now. The second part of the original contributions section is dedicated to the investigation of some polymer-layered silicates composites, using a commercial layered silicate (Cloisite 30B), modified with OH-containing quaternary ammonium salts. First, a new ATRP-based procedure to synthesize polymer-layered silicate composites involving a simpler method than those published in the literature up to now, was studied. The novelty of the methods consists in the one-step preparation of the ATRP initiating sites anchored onto the layered silicate by reacting the OH groups of the quaternary ammonium salt with chloroacetic anhydride, followed by the situ” ATRP of the monomer. This way several intermediate stages are eliminated. The last experimental study concerns the synthesis and characterization of a composite with an inorganic support (Cloisite 30B) and a polymeric matrix synthesized by the copolymerization of two different monomers with high reactivity: 2-hydroxyethyl methacrylate and 4-chloro-methyl-styrene. To our knowledge, there are no studies published in the literature describing the preparation of this composite until now. The obtained composite materials were characterized both structurally by FT-IR, NMR, XRD and SEM, and from the thermal behavior point of view by TGA-DSC-MS

Maleic anhydride

In situ polymerization

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Cellulose-Based Composites for Membranes by “In Situ” Radical Polymerization

Molecular Crystals and Liquid Crystals (2008)

Nicoleta Doriana Stanciu Dumitru Mircea Vuluga Ana‐Maria Albu Thierry Hamaide Mircea Teodorescu

Cellulose-containing composites based on copolymers of acrylic acid with styrene, 4-chloro-methyl-styrene and maleic anhydride were prepared for proton conducting membranes. The influence of the substrate on the copolymer composition as well as the copolymer/cellulose ratio on the basic properties of composite materials is discussed using the FT-IR, optical microscopy, SEM, TGA-DSC and conductivity measurements. Moderate water swelling (2–10%) of the synthesized membranes provided volume resistivities down to 1 × 105 Ω · cm, adequate for further processing as proton exchange membrane.

Maleic anhydride

Maleic acid

Cellulose triacetate

Acrylic acid

10.1080/15421400801903452

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Citations (1)