What type of polymerization is involved in PVC?
What type of polymerization is involved in PVC?
Polyvinyl chloride is produced by polymerization of the vinyl chloride monomer (VCM), as shown. About 80% of production involves suspension polymerization. Emulsion polymerization accounts for about 12%, and bulk polymerization accounts for 8%.
Which polymer is formed by Vinylchloride?
Vinyl chloride is used to make polyvinyl chloride (PVC). PVC is used to make a variety of plastic products, including pipes, wire and cable coatings, and packaging materials. Vinyl chloride is also known as chloroethene, chloroethylene, and ethylene monochloride.
What is the chemical formula of vinyl chloride?
C2H3Cl
Vinyl chloride/Formula
Is PVC formed by addition polymer?
During the addition polymerization, all monomers are consumed and no byproducts are formed. Common examples of addition polymerization are polyethylene, polyvinyl chloride (PVC), acrylics, polystyrene, polytetrafluoroethylene, and polyoxymethylene (acetal).
Why is PVC an addition polymer?
Polyvinyl chloride is produced in an addition polymerisation reaction using the chloroethene (vinyl chloride) monomer. This polymerisation reaction proceeds by a free-radical mechanism. Polyvinyl chloride is a thermoplastic, it softens when heat and pressure is applied, so it can be moulded into different shapes.
How chloroethene is polymerised to Polychloroethene?
(c) Polymerization of chloroethene (vinyl chloride) PVC is made by free-radical polymerization in suspension. The monomer (bp 259 K) is polymerized in aqueous dispersion at 325-350 K. Pressure (13 atm) is used to keep the monomer in a liquid phase. For polymerization to be controlled, an initiator is needed.
What is the result of polymerization of vinyl chloride?
Polyvinyl chloride (PVC) is a synthetic resin made from the polymerization of vinyl chloride. PVC is a commonly used polymer that finds applications in a variety of products due to its excellent properties and low cost.
What is prepared by the polymerization of vinyl chloride molecules?
Polyvinyl chloride also known as PVC is formed by the polymerisation of vinyl chloride.
How does addition polymerisation work?
The formation of poly(ethene) from ethene is an example of addition polymerisation. Small unsaturated ethene monomers join up by the opening of the double bond allowing them to join up to form a long carbon chain. Polymers made in this way are called addition polymers.
What is the mechanism of addition polymerization?
One of the most common mechanisms is addition polymerization. In addition polymerization the growth of the polymer chain proceeds exclusively by reaction (s) between monomer (s) and reactive site (s) on the polymer chain. The addition of new monomer units occurs one at a time via chain reaction.
What are the three stages of addaddition polymerization?
Addition polymerization (also known as free-radical polymerization) has three stages: initiation, propagation and termination.
What are the initiators for addition polymerization of vinylidene?
The initiators for addition polymerization fall into three general categories, namely, free radical, cationic, and anionic. The choice of which one is used strongly depends on the effects of the R 1 and R 2 groups of the vinylidene monomer on the double bond.
What is the source of free radicals in addition polymerization?
To initiate an addition polymerization reaction, a source of free radicals is required that are provided by an initiator. The initiator, usually BPO, dissociates upon the provision of thermal, chemical, or light energy and generates free radicals in a process called activation.
