A direct preparation of silica shell on polystyrene microspheres prepared by dispersion polymerization with polyvinylpyrrolidone

2008 ◽  
Vol 46 (8) ◽  
pp. 2884-2890 ◽  
Author(s):  
Jinho Hong ◽  
Hyekyung Han ◽  
Chang Kook Hong ◽  
Sang Eun Shim
Keyword(s):  
Dispersion Polymerization ◽  
Silica Shell ◽  
Polystyrene Microspheres ◽  
Direct Preparation

Factorial design optimization of polystyrene microspheres obtained by aqueous dispersion polymerization in the presence of poly(2‐ethyl‐2‐oxazoline) reactive stabilizer

2020 ◽  
Vol 69 (11) ◽  
pp. 1122-1129
Author(s):  
Tanta‐Verona Iordache ◽  
Nicoleta D Banu ◽  
Elena D Giol ◽  
Dumitru M Vuluga ◽  
Florica A Jerca ◽  
...  
Keyword(s):  
Design Optimization ◽  
Factorial Design ◽  
Dispersion Polymerization ◽  
Aqueous Dispersion ◽  
Polystyrene Microspheres

Direct preparation of vesicles from one-pot RAFT dispersion polymerization

Polymer ◽  
2010 ◽  
Vol 51 (22) ◽  
pp. 5115-5121 ◽  
Author(s):  
Chuan-Qun Huang ◽  
Cai-Yuan Pan
Keyword(s):  
Dispersion Polymerization ◽  
One Pot ◽  
Direct Preparation

Rapid Synthesis of Non-Crosslinked and Monodisperse Polystyrene Microspheres

2013 ◽  
Vol 634-638 ◽  
pp. 2222-2227
Author(s):  
Chang Ming Ye ◽  
Yan Qin Yang ◽  
Feng Dong ◽  
Li Li ◽  
Xi Long Hao ◽  
...  
Keyword(s):  
Dispersion Polymerization ◽  
Monomer Concentration ◽  
Volume Ratio ◽  
Polymerization Process ◽  
Polystyrene Microspheres ◽  
Fenton Reagent ◽  
Uniform Size ◽  
Transmission Electron ◽  
New Synthesis ◽  
Monodisperse Polystyrene

Non-crosslinked and monodisperse polystyrene (PS) microspheres showing uniform size were synthesized by using a dispersion polymerization technique in the presence of the Fenton reagent (FeSO4/H2O2) as an initiator. The effects of stabilizer dosage, monomer concentration, volume ratio of dispersion medium and reaction time on both the morphology and dispersity of PS microspheres were investigated. The results of transmission electron microscopy (TEM) and field emission scanning electron microscope (FESEM) indicated that the obtained PS microspheres are perfect with uniform size of about 170 nm under the optimum experimental condition. On the basis of the experimental results, the mechanism of PS polymerization was proposed, which should be helpful to guide the preparation of polymer microspheres with desired uniform size. In comparison with the conventional emulsion polymerization, this new synthesis technique with the Fenton reagent exhibits some advantages such as being a simple and fast polymerization process without deoxygenation.

scholarly journals Synthesis of Controllable Carboxylated Polystyrene Microspheres by Two-Step Dispersion Polymerization with Hydrocarbon Alcohols

2018 ◽  
Vol 2018 ◽  
pp. 1-8 ◽  
Author(s):  
Bin Zhang ◽  
Jiazhen Lu ◽  
Xin Liu ◽  
Haibo Jin ◽  
Guangxiang He ◽  
...  
Keyword(s):  
Reaction Time ◽  
Dispersion Polymerization ◽  
Great Influence ◽  
Gel Permeation Chromatography ◽  
Polystyrene Microspheres ◽  
Carboxyl Content ◽  
Solvent Type ◽  
Gel Permeation ◽  
Carboxyl Group Content ◽  
Hydrocarbon Alcohols

Carboxylated polystyrene (PS) microspheres were synthesized by the two-step dispersion polymerization of styrene in hydrocarbon alcohols (CnH2n+1OH,n=1–5) in the presence of acrylic acid (AA) as a functional comonomer, 2,2′-azobis-(2-methylbutyronitrile) (AMBN) as the initiator and polyvinylpyrrolidone (PVP55) as the dispersant. The effects of solvent type, AA concentration, and first reaction time on the carboxyl content on the microsphere surfaces were investigated. The PS microspheres were characterized by scanning electron microscopy, infrared spectroscopy, nuclear magnetic resonance, and gel permeation chromatography. The results showed that the first reaction time of the two-stage dispersion polymerization had a great influence on the nucleation process, and appropriately prolonging the first-step reaction time had a great influence on the surface carboxyl content. The effect of the solvent on the surface carboxyl content of PS microspheres was significant. With n-butanol as the solvent, the carboxyl group content on the surface of the microspheres reached 57.05 mg/g.

Particle size control in dispersion polymerization of polystyrene

1985 ◽  
Vol 63 (1) ◽  
pp. 209-216 ◽  
Author(s):  
Kar P. Lok ◽  
Christopher K. Ober
Keyword(s):  
Particle Size ◽  
Dispersion Polymerization ◽  
Homogeneous Solution ◽  
Size Control ◽  
Polymer Particle ◽  
Single Step ◽  
Spherical Particles ◽  
Polymerization Process ◽  
Aggregation Behaviour ◽  
Direct Preparation

In a dispersion polymerization process, the reaction mixture starts out as a homogeneous solution and the resulting polymer precipitates as spherical particles, stabilized by a steric barrier of dissolved polymer. The final polymer particle size is determined by the inherent polymer aggregation behaviour under a given set of conditions. In the present study styrene polymerization was studied in various solvents using cellulosic derivatives as the steric stabilizer. Some of these solvents in certain combinations allowed the direct preparation of particles in the micron size and their size distribution appeared to be highly dependent on the monomer–solvent–initiator system. Investigations of these factors have suggested that monodisperse particles up to 12 μm can be prepared in a single step; studies of several systems are delineated.

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