Vinyl Chloride Addition Polymerization

Anionic addition polymerization is a form of chain growth polymerization or addition polymerization that involves the polymerization of monomers initiated with anions.

Vinyl chloride addition polymerization.

Vinyl acetate is an industrial chemical that is produced in large amounts in the united states. When treated with certain catalysts vinyl chloride monomers undergo polymerization and form the larger compound known as polyvinyl chloride or pvc. Pvc is used in the manufacture of numerous products including packaging films and water pipes. It is very flammable and may be ignited by heat sparks or flames.

Emulsion polymerization accounts for about 12 and bulk polymerization accounts for 8. Polymerization of vinyl chloride vc was studied. Vinyl chloride is primarily used to make polyvinyl chloride to manufacture plastics. Natural evolution of hcl from vc occurred in the polymerization.

Following its generation the initiating free radical adds nonradical monomer units thereby growing the polymer chain. It is a clear colorless liquid with a sweet fruity smell. Vinyl chloride is a chlorinated hydrocarbon occurring as a colorless highly flammable gas with a mild sweet odor that may emit toxic fumes of carbon dioxide carbon monoxide hydrogen chloride and phosgene when heated to decomposition. Under pressure the gaseous chloroethene molecules are forced closer together to form a liquid.

Vinyl acetate is used to make other industrial chemicals. From its flake or pellet form pvc is sold to companies that heat and mold the pvc into end products such as pvc pipe and bottles. Often anionic polymerization involves living polymerizations which allows control of structure and composition. Vc vc α d 1 vc β β d 2 and vc d 3 were used to study the reactivities of the hydrogen atoms in the polymerization and the β hydrogen atoms contributed to the chain transfer.

The final product of the polymerization process is pvc in either a flake or pellet form. The monomer chloroethene or vinyl chloride has a boiling point of 14 o c 259k so it is a gas at room temperature and pressure. Vinyl chloride liquid is fed to polymerization reactors where it is converted from a monomeric vcm to a polymeric pvc. Vinyl chloride suspension polymerization was carried out in a pilot scale reactor to study the effects of different methods of initiator addition on poly vinyl chloride pvc resin properties.

The type of reaction has many manifestations but traditionally vinyl monomers are used. Polyvinyl chloride is produced in an addition polymerisation reaction from chloroethene vinyl chloride monomers. Free radicals can be formed by a number of different mechanisms usually involving separate initiator molecules.