Chain Growth Polymerization Of Vinyl Chloride

In slurry polymerization chain growth occurs as monomers dissolved in a hydrocarbon solvent add to growing chains also dissolved in the solvent.

Chain growth polymerization of vinyl chloride.

Polymerization of isobutylene 2 methylpropene by traces of strong acids is an example of cationic polymerization. The largest family of polymers 3 vinyl polymers are produced by chain polymerization reactions a good example is the free radical polymerization of styrene which is initiated by a free radical r that reacts with styrene. The polyisobutylene product is a soft rubbery solid tg 70º c which is used for inner tubes. Radical chain growth polymerization of vinyl chloride.

To repeat the animation click on the drawing. The polymerization of vinyl monomers occurs by rupture of the double bond and creation of a simple covalent bond with the nearby monomer. Free radical polymerization frp is a method of polymerization by which a polymer forms by the successive addition of free radical building blocks. Chain polymerization of vinyl monomers is a convenient technique for the preparation of a wide variety of functional polymers.

There are a limited number of these active sites at any moment during the polymerization which gives this method its key characteristics. Ch 2 ch in which the c c double bond is present. This process is similar to radical polymerization as demonstrated by the following equations. In practice larger numbers of moderately sized chains are formed indicating that chain terminating reactions must be.

The in species represents the initiating radical which might originate from a peroxide or azo initiator. A typical polymerization includes 180 parts water and 100 parts vinyl chloride monomer chain transfer agent trichloro ethylene. The reactants are then heated in the closed system to about 50 c and the pressure rises to about 0 5 mpa. With chain polymerization what are termed vinyl polymers are obtained because the monomers from which it starts contain the vinyl group.

Free radicals can be formed by a number of different mechanisms usually involving separate initiator molecules. To see an animated model of the radical chain growth polymerization of vinyl chloride. The polymerization reaction in the reactor takes place by means of chain growth polymerization of vinyl chloride monomer vcm. The main problem is the amount of r vcm in the final pvc slurry which has to be less than 1.

The following animation illustrates the polymerization of vinyl chloride initiated by radicals. Chain growth polymerization american spelling or chain growth polymerisation english spelling is a polymerization technique where unsaturated monomer molecules add onto the active site on a growing polymer chain one at a time. Following its generation the initiating free radical adds nonradical monomer units thereby growing the polymer chain.