Explain The Polymerization Of Vinyl Chloride

Molecular weights of the polymers have b.

Explain the polymerization of vinyl chloride.

Definition of vinyl type polymerization. About 80 of production involves suspension polymerization. The polymerization of vinyl chloride has been studied dilatometrically in chlorobenzene using azoisobutyronitrile as an initiator at temperatures between 30 and 45 c and with monomer and initiator concentrations varying from 1 0 to 8 1 m and from 0 005 to 0 1 m respectively. 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.

For efficient cationic polymerization of vinyl monomers it is necessary that the carbon carbon double bond be the strongest nucleophile in the molecule. Free radicals can be formed by a number of different mechanisms usually involving separate initiator molecules. About 80 of production involves suspension polymerization. Natural evolution of hcl from vc occurred in the polymerization.

Polyvinyl chloride is produced by polymerization of the vinyl chloride monomer vcm. Thus vinyl acetate would be classed as an electron donor type monomer section 9 10 2 but it cannot be polymerized cationically because the carbonyl group complexes the active center. Following its generation the initiating free radical adds nonradical monomer units thereby growing the polymer chain. Pvc is used in the manufacture of numerous products including packaging films and water pipes.

Emulsion polymerization accounts for about 12 and bulk polymerization accounts for 8. The surfactant molecules composed of a hydrophilic water attracting and hydrophobic water repelling end form a stabilizing emulsion before polymerization by coating the monomer droplets. A typical polymerization includes 180 parts water and 100 parts vinyl chloride monomer chain transfer agent trichloro ethylene. Other surfactant molecules clump together into smaller aggregates called micelles which also absorb monomer molecules.

Addition polymerization of vinyl compounds or related unsaturated compounds as vinylidene chloride. Polymerization of vinyl chloride vc was studied. The reactants are then heated in the closed system to about 50 c and the pressure rises to about 0 5 mpa. Free radical polymerization frp is a method of polymerization by which a polymer forms by the successive addition of free radical building blocks.

Emulsion polymerizationaccounts for about 12 and bulk polymerizationaccounts for 8.