Polymer particle formation in styrene polymerization in aqueous media at low surfactant concentrations.

the effects of temperature, initiator and stabilizer on polymer particle size in suspension polymerization of styrene

in suspension polymerization, particle size distribution of polymer is the outcome of dynamic equilibrium between the break up and coalescence phenomena. the rates of break up and coalescence and consequently polymerization stability depend on several parameters, the most important of which are type and concentration of stabilizer. in this study, the effects of type and concentration of stabili...

Dynamic Evolution of Droplet/Particle Size Distribution in Suspension Polymerization of Styrene

Removal of zinc ions from aqueous solution using micellar- enhanced ultrafiltration at low surfactant concentrations

Micellar-enhanced ultrafiltration (MEUF) of zinc ions (Zn2+) from aqueous solutions using single anionic surfactant sodium dodecyl sulphate (SDS) at low critical micelle concentrations (cmc) (0.2×cmc – 3×cmc) was investigated. When the initial SDS concentration was below the cmc, unexpectedly high rejection (97.5%) was obtained due to concentration polarisation occurring near the membrane-solut...

Nanocrystal Formation in Aqueous Insertion Polymerization

High molecular weight linear polyethylene, in the form of 7 nm thin single-lamella nanocrystals with a diameter of up to 200 nm, is generated via aqueous catalytic polymerization using the water-soluble catalyst precursor [κN,O-{2,6-(3′,5′-(F3C)2C6H3)2C6H3-NC(H)-(3,5-I2-2-OC6H2)}NiCH3{P(3-C6H4SO3Na)3}] (1-TPPTS). Studies under true pressure reactor conditions using a C-labeled catalyst precurs...

Pickering Emulsion Polymerization of Styrene-co-butyl Acrylate Nanoparticles by Using Cloisite Na+ as Surfactant

Cloisite Na+was used as a solid surfactant (stabilizer) in Pickering emulsion polymerization of styrene-co-butyl acrylate in presence of oil soluble initiator, azobisisobutyronitrile (AIBN) and water soluble initiator, potassium persulfate (KPS). Fourier transform infrared (FTIR) spectrum approved the corporation of Cloisite Na+ layers within the polymer matrix. Effect of clay content was a...