Polymerization emulsion polymerization

Emulsion Polymerization. Emulsion polymerization is the most important industrial method for the preparation of acryhc polymers. The principal markets for aqueous dispersion polymers made by emulsion polymerization of acryhc esters are the paint, paper, adhesives, textile, floor pohsh, and leather industries, where they are used principally as coatings or binders. Copolymers of either ethyl acrylate or butyl acrylate with methyl methacrylate are most common. 

Emulsion Polymerization. Emulsion polymerization is used commercially to make vinyhdene chloride copolymers. In some apphcations, the resulting latex is used directiy, usually with additional stabilizing ingredients, as a coating vehicle to apply the polymer to various substrates. In other... 

Emulsion Polymerization. Emulsion polymerization takes place in a soap micelle where a small amount of monomer dissolves in the micelle. The initiator is water-soluble. Polymerization takes place when the radical enters the monomer-swollen micelle (91,92). Additional monomer is supphed by diffusion through the water phase. Termination takes place in the growing micelle by the usual radical-radical interactions. A theory for tme emulsion polymerization postulates that the rate is proportional to the number of particles [N. N depends on the 0.6 power of the soap concentration [S] and the 0.4 power of initiator concentration [i] the average number of radicals per particle is 0.5 (93). 

Polymerization. Emulsion polymerization is used, but the latex is too unstable for use and all the latex is coagulated to dry mbber. The molecular weight range is 100,000—200,000 with a Mooney viscosity of 50—70. 

Emulsion Polymerization. Emulsion polymerization uses soaps and anionic surfactants to create two-phase systems that have having long-term stability. The key steps in a batch emulsion polymerization are the following ... 

Blending vegetable oils Blending gasoline Clay dispersion Fermentation (pharmaceutical) Suspension polymerization Emulsion polymerization Solution polymerization... 

Why are some initiators water soluble and others monomer soluble Which type is used for suspension polymerization Emulsion polymerization ... 

First stage of polymerization emulsion polymerization of styrene, hydroxye-thyl methacrylate, and acrylic acid in the presence of isooctane. 

For the copolymerization of ethene and vinyl acetate, solution polymerization, suspension polymerization, emulsion polymerization and bulk polymerization may be used, but solution polymerization is preferred (1). A method of either continuous type or batch type may be employed. Methanol is generally used as the solvent. 

Water or other nonsolvent Polymer or polymer in solution Suspension, dispersion, or emulsion polymerization Emulsion polymerization of a rubber latex. Suspension polymerization of expandable polystyrene... 

Liquid-liquid mixing is widely used in liquid-liquid extraction operation, dispersion polymerization, emulsion polymerization, and so on. In general, in a mutually insoluble liquid-liquid system, one liquid is dispersed into another and the liquid with the smaller volume transforms into droplets however, when the volume of both liquids is almost identical, it is unclear which liquid becomes a droplet. 

Since mixing and good heat transfer are of vital importance in viscous polymerization reactions, a mechanically agitated continuous stirred-tank reactor is widely used in polymerization processes. Solution polymerization, emulsion polymerization, and solid-catalyzed olefin polymerization are all carried out in a mechanically agitated slurry reactor. 

Any colloidal material provides an intrinsically favorable accessibility to its surface when compared to bulk material. Therefore, the availability of receptor binding sites should be facilitated by using colloidal MIPs. Submicron scale MIPs were prepared by precipitation polymerization, emulsion polymerization, and miniemulsion polymerization. Precipitation polymerization uses the insolubility of the formed polymer microgel in a certain solvent, whereas emulsion and miniemulsion polymerization employ two solvent phases for the preparation of the colloidal polymer. The latter methods offer the opportunity for tailoring the surface of the colloids exclusively, thereby enhancing the accessibility of the binding sites. Each of the three approaches has their own characteristics and will be described in the following sections. 

There are four main types of liquid-phase heterogeneous free-radical polymerization microemulsion polymerization, emulsion polymerization, miniemulsion polymerization and dispersion polymerization, all of which can produce nano- to micron-sized polymeric particles. Emulsion polymerization is sometimes called macroemulsion polymerization. In recent years, these heterophase polymerization reactions have become more and more important... 

As an alternative to suspension polymerization, emulsion polymerization offers a number of potential aclvanlages. While superficially similar, there are... 

Emulsion Polymerization. As noted with suspension polymerization, emulsion polymerization also involves the dispersion of VCM in an aqueous medium. As distinguished from suspension polymerization, however, the emulsion process involves the use of a surface active agent or soap as the emulsifier and a water-soluble catalyst or initiator instead of the monomer-soluble catalyst used in suspension processes. Although agitation is necessary, it is not as important as in the suspension processes because the emulsion is maintained by use of the soap and protective colloids to insure latex stability. 

Synthesis of polymer microspheres in the presence of magnetic nanoparticles, such as suspension polymerization or its modified versions, dispersion polymerization, surface-initiated radical polymerization, acid-catalyzed condensation polymerization, emulsion polymerization, mini-/microemulsion polymerization, in situ oxidative polymerization, inverse emulsion cross-linking, emulsion/double emulsion-solvent evaporation, and supercritical fluid extraction of o/w miniemulsion... 

Keywords Controlled/living radical polymerization Core-shell particle Dispersion polymerization Emulsion polymerization Grafting from Hybrid Miniemulsion polymerization Nanogel Nanoparticle... 

Keywords Core-sheU morphology Dispersion polymerization - Emulsion polymerization Ferrofluids Hybrid latex Magnetic latexes - Magnetic nanoparticles... 

Chem. Descrip. Sodium dodecylbenzene sulfonate, branched CAS 25155-30-0 EINECS/ELINCS 246-680-4 Uses Emulsifier for styrene, vinyl chloride polymerization, emulsion polymerization, paints/coatings food pkg. adhesives, rubber articles defoamer in food-contact paper/paperboard emulsifier in mfg. of food-con-tact articles... 

Uses Surfactant for vinyl and vinylidene chloride, acrylic, styrene-acrylic, SBR polymerization, emulsion polymerization in paints/coatings food pkg. adhesives emulsifier in mfg. of food-contact articles Regulat EDA 21CER 175.105,178.3400 Properties Pale yel. clear liq. anionic 40% act. 

Emulsion polymerization Emulsion polymerization starts with a dispersion of monomer micelles in a nonsolvent medium stabilized by appropriate surfactant molecules. Polymerization proceeds within each spherical micelle once a radical enters the micelle from the continuous phase, which finally results in a dispersion of latex. Dispersed phase (monomer), continuous phase (nonsolvent and initiator), surfactant < 1 pm, uniform in size... 

---