Two types of polyvinyl chloride (PVC) homopolymer are produced: rigid resins which have considerable strength and hardness; and flexible resins that contain a large proportion of plasticizers to make them soft and stretchable.
Rigid PVC resins are mainly extruded or moulded to make pipe and conduit, fittings, windows, roof tiles, fencing and automobile parts. Flexible PVC finds outlets in film and sheets, wire and cable coating, flooring, shower curtains and synthetic leather products.
Polyvinyl chloride consumption is mostly influenced by the construction industry and so demand correlates closely with economic growth. The global PVC market had been growing around 4%/year with strongest demand growth seen in Asia, in particular China and India. However, global demand collapsed in 2008 due to the economic downturn and destocking throughout the chain. Recovery is expected to be slow in many markets.
Polymerisation is normally performed at 40-70oC with the vinyl chloride monomer (VCM) in a liquid state under pressure in a batch reactor. Suspension polymerisation is the most common PVC process because the resins produced are the most versatile and suitable for a wide range of applications.
Polyvinyl chloride occurs as white, amorphous, odourless powder. PVC is stable under normal temperatures and pressures but above 80oC the resin discolours and evolves hydrogen chloride.
Polyvinyl chloride
Price Reports
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Polyvinyl chloride
Uses and Outlook
Two types of polyvinyl chloride (PVC) homopolymer are produced: rigid resins which have considerable strength and hardness; and flexible resins that contain a large proportion of plasticisers to make them soft and stretchable.
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Polyvinyl chloride
Process Technologies
A number of PVC processes are employed according to the end application, but polymerisation is normally performed at 40-70oC with the VCM in a liquid state under pressure in a batch reactor. All routes employ free radical initiators which are either soluble in the monomer or in the aqueous solution.
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