08-20-2014, 09:27 AM
Polymerization Of Plastics
The process of producing resins of plastics is called polymerization. thus polymerization is the process of combining molecules of compounds to form another complex molecule.
By addition polymerization :
In this process the same molecules are made to form a bigger molecule . Thus , in the preparation of polythene (polythene), ethane , a carbon compound , is passed under pressure into an inert insolvent containing a special catalyst (a Ziegler catalyst named after the inventor of the process) to form a polymer A high density form of ethane called polyethane or polythene with a softening point of 130° C is produced. We are familiar with polythene sheets in our everyday life
By condensation polymerization:
in this process a large number of identical or different molecules combine and a low molecular substance is removed . For example terylene is a condensation polymer It is synthesized from alcohol ,ethene, glycol and a benzene derivative when heated together , eliminates molecules of water between them and become terylene . Nylon is another example of a condensation polymer .
By Co-polymerization:
In this process , two or more different monomers are added together to from a polymer . Phenol formaldehyde is produced by reaction of phenol and formaldehyde.
The process of producing resins of plastics is called polymerization. thus polymerization is the process of combining molecules of compounds to form another complex molecule.
By addition polymerization :
In this process the same molecules are made to form a bigger molecule . Thus , in the preparation of polythene (polythene), ethane , a carbon compound , is passed under pressure into an inert insolvent containing a special catalyst (a Ziegler catalyst named after the inventor of the process) to form a polymer A high density form of ethane called polyethane or polythene with a softening point of 130° C is produced. We are familiar with polythene sheets in our everyday life
By condensation polymerization:
in this process a large number of identical or different molecules combine and a low molecular substance is removed . For example terylene is a condensation polymer It is synthesized from alcohol ,ethene, glycol and a benzene derivative when heated together , eliminates molecules of water between them and become terylene . Nylon is another example of a condensation polymer .
By Co-polymerization:
In this process , two or more different monomers are added together to from a polymer . Phenol formaldehyde is produced by reaction of phenol and formaldehyde.