Classification of Polymers
Polymers are classified into different types on the basis of monomers, source of availability, structure,mode of synthesis.
On the basis of monomers
On the basis of the monomers polymers are classified into two types namely
Homopolymer
Homopolymer consist of only one type of monomers.
For example
Similarly
Polyvinyl chloride (PVC) contains monomer
CH₂=CH
|
Cl
Polyacrylonitrile (PAN) contains monomer
CH₂=CH
|
CN
Copolymer (or mixed) polymer
Copolymer contains two or more different monomers.
For example
Classification based on source of availability
Polymers are divided into three types on the basis of source of availability.
Natural polymers
The Polymers obtained from nature ( i.e plants and animals) are called natural polymers.
For example; cellulose, starch, proteins, nucleic acids.
Synthetic Polymers
The Polymers prepared in laboratory are called synthetic Polymers. These Polymers are also called man made Polymers.
For example: Polythene, Nylon,Teflon, PVC .
Semi- Synthetic Polymers
These are natural polymers with some modifications.
For example; Cellulose diacetate, Vulcanised rubber.
Classification of Polymers on the basis of Structure
Polymers are classified into three types on the basis of Structure.
Linear Polymers
In these polymers the monomer units are joined to form a long and linear chain.
For example;High density polythene,PVC, Nylon, Polyester.
Branched chain Polymers
In these polymers the monomer units are joined to form long chain with branches of different length.
Cross-linked polymers
In these polymers the monomer units are cross-linked to form a three dimensional network.
For example; Bakelite, melamine formaldehyde resin.
Classification of polymers on the basis of synthesis
Polymers are classified into two types on the basis of mode of synthesis.Addition Polymers
Polymers obtained during addition reaction are called addition Polymers.
For example; Polythene
Condensation Polymers
Polymers obtained during condensation reaction are called condensation Polymers.
For example; Nylon, Terylene.
For example; Nylon, Terylene.
Comments
Post a Comment