نتایج جستجو برای: emulsion polymerization

تعداد نتایج: 40838  

Journal: :Biomacromolecules 2010
Johannes Pecher Johannes Huber Martin Winterhalder Andreas Zumbusch Stefan Mecking

Sonogashira coupling of dibromo- and diethynyl-substituted benzenes and fluorenes in aqueous mini-emulsion afforded colloidally stable dispersions of highly fluorescent 60-120 nm particles of poly(arylene ethynylene)s of molecular weights M(n) 4 × 10(4)-2 × 10(5) g mol(-1) with solids contents up to 15 wt %. By covalent incorporation of diethynyl pyrrolo-pyrrole or diethynyl fluorenone in the m...

2011
Nicolas Vogel Ulrich Ziener Achim Manzke Alfred Plettl Paul Ziemann Johannes Biskupek Clemens K Weiss Katharina Landfester

The benefits of miniemulsion and emulsion polymerization are combined in a seeded emulsion polymerization process with functional seed particles synthesized by miniemulsion polymerization. A systematic study on the influence of different reaction parameters on the reaction pathway is conducted, including variations of the amount of monomer fed, the ratio of initiator to monomer and the choice o...

Journal: :علوم و تکنولوژی پلیمر 0
سید مهرداد جلیلیان فرشید ضیایی

a mixture  of  sodium  lauryl  sulfate  (sls)  as  ionic  emulsifer  and  stearyl alcohol as non-ionic emulsifer was employed in a vinyl chloride emulsion polymerization  reaction  to  study  the  infuence  of  various  interactive parameters involved in the reaction system. it was found that the particle size was dependent on the amount and type of emulsifer. the average particle size of polyv...

M. Yari S. Sedaghat

Metal—Polyaniline nanocomposites such as Platinum-Polyaniline nanocomposite is prepared by insitu oxidative polymerization of aniline and reduction of Pt+4 ions into Pt nanoparticles. Thepolymerization of aniline was carried out in the presence of 1(2PtCN6 [Potassium Hexa CyanoPlatinate (IV)] as oxidizing agent. During the reaction aniline monomers undergo oxidation andform polyaniline (PANT) w...

Journal: :Polymer Chemistry 2021

Aqueous emulsion polymerization via reversible complexation mediated living radical yielded low-dispersity poly(methyl methacrylate)s and polystyrenes.

Journal: :Journal of the American Chemical Society 2003
Florian M Bauers Ralf Thomann Stefan Mecking

Particles of linear polyethylene (M(n) = (2-3) x 10(3) g x mol(-)(1); M(w)/M(n) = 2-4) obtained by catalytic emulsion polymerization of ethylene possess a nonspherical, lentil-like shape with an average aspect ratio of ca. 10 and diameters from 30 to >300 nm, as determined by TEM and AFM. The particle structure results from a stacking of the lamellae along the one shorter axis of the lentils (i...

Journal: :Chemical communications 2011
Xiantao Shen Lei Ye

Molecularly imprinted polymer microspheres were synthesized by Pickering emulsion polymerization. Fluorescence spectroscopic investigations provided insights into the template recognition in water.

Journal: :Journal of colloid and interface science 2007
Jeongwoo Lee Chang Kook Hong Soonja Choe Sang Eun Shim

Core-polystyrene/shell-silica nanocomposite particles are synthesized by simple soap-free emulsion polymerization employing positively charged silica sol. The polymerization is initiated with conventional anionic KPS. It is found that the silica sol should be added after the initiation and nucleation of the soap-free emulsion polymerization in order to obtain colloidally stable composite partic...

Journal: :Chemical communications 2009
Guillaume Delaittre Charlotte Dire Jutta Rieger Jean-Luc Putaux Bernadette Charleux

Polymerization-induced formation of amphiphilic diblock copolymer vesicles is performed in water at high concentrations by a single-step nitroxide-mediated controlled free-radical emulsion polymerization of 4-vinylpyridine, initiated by a water-soluble poly(sodium acrylate) macroalkoxyamine at alkaline pH.

Journal: :Chemical communications 2010
Stéphanie Boissé Jutta Rieger Khaled Belal Aurélie Di-Cicco Patricia Beaunier Min-Hui Li Bernadette Charleux

Self-assembled block copolymer nanofibers are attractive materials for multiple applications. We propose here a novel, very simple and straightforward method to prepare polymeric nanofibers at high solids contents directly in water. It is based on an aqueous emulsion polymerization process performed under living radical polymerization conditions, using the RAFT method.

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