Polymer, Homopolymer, Copolymer and Graft Copolymer

POLYMER, HOMOPOLYMER, COPOLYMER AND GRAFT COPOLYMER

Polymer
A polymer is large molecule formed by repeating linking of small molecules called monomers. For example, polyethylene is a polymer formed by repeating linking of ethylene molecules. Thus:
nCH2 = CH2 [-CH2-CH2-]n
Ethylene (monomer) Polyethylene (polymer)

The number of repeating unit (n) in the chain formed the polymer is known as degree of polymerisation (DP). Polymer with high DP is called high polymers. Molecular weight of polymer may vary from 104 up to several millions.

Homopolymer
A polymer which has a single or same type of repeating unit, may be referred to an homopolymer. The backbone of homopolymer entirely builds up the same repeating units.
M1 - M1 - M1- M1 - M1 - M1 - M1

Copolymer
A polymer which has two different repeating units is called copolymer and the process by which it is synthesised is referred to as copolymerisation.
---------M1 – M2 ¬– M1¬ – M2 – M1 – M2– M1 – M2 – M1 – M2 – M1---------

Graft Copolymer
Graft copolyerisation results from the formation of an active site at a point on a polymer molecule other than its end, exposure to second monomer. Most graft copolymers are formed by radical polymerisation. The major active reaction is chain transfer to polymer. In many instances the transfer reaction involves subtraction of a hydrogen atom. Ultraviolet or ionising radiation or redox initiation among other methods can also use to produce polymer radicals leading to graft copolymer. A graft copolymer is a branched copolymer with a backbone of a linear or homopolymer.


------M1 – M1 ¬– M1¬ – M1 – M1 – M1– M1 – M1 – M1 – M1 – M1------





















POLYMER, HOMOPOLYMER, COPOLYMER AND GRAFT COPOLYMER
Polymer
A polymer is large molecule formed by repeating linking of small molecules called monomers. For example, polyethylene is a polymer formed by repeating linking of ethylene molecules. Thus:
nCH2 = CH2 [-CH2-CH2-]n
Ethylene (monomer) Polyethylene (polymer)
The number of repeating unit (n) in the chain formed the polymer is known as degree of polymerisation (DP). Polymer with high DP is called high polymers. Molecular weight of polymer may vary from 104 up to several millions.
Homopolymer
A polymer which has a single or same type of repeating unit, may be referred to an homopolymer. The backbone of homopolymer entirely builds up the same repeating units.
M1 - M1 - M1- M1 - M1 - M1 - M1
Copolymer
A polymer which has two different repeating units is called copolymer and the process by which it is synthesised is referred to as copolymerisation.
---------M1 – M2 ¬– M1¬ – M2 – M1 – M2– M1 – M2 – M1 – M2 – M1---------
Graft Copolymer
Graft copolyerisation results from the formation of an active site at a point on a polymer molecule other than its end, exposure to second monomer. Most graft copolymers are formed by radical polymerisation. The major active reaction is chain transfer to polymer. In many instances the transfer reaction involves subtraction of a hydrogen atom. Ultraviolet or ionising radiation or redox initiation among other methods can also use to produce polymer radicals leading to graft copolymer. A graft copolymer is a branched copolymer with a backbone of a linear or homopolymer.


------M1 – M1 ¬– M1¬ – M1 – M1 – M1– M1 – M1 – M1 – M1 – M1------










POLYMER, HOMOPOLYMER, COPOLYMER AND GRAFT COPOLYMER
Polymer
A polymer is large molecule formed by repeating linking of small molecules called monomers. For example, polyethylene is a polymer formed by repeating linking of ethylene molecules. Thus:
nCH2 = CH2 [-CH2-CH2-]n
Ethylene (monomer) Polyethylene (polymer)
The number of repeating unit (n) in the chain formed the polymer is known as degree of polymerisation (DP). Polymer with high DP is called high polymers. Molecular weight of polymer may vary from 104 up to several millions.
Homopolymer
A polymer which has a single or same type of repeating unit, may be referred to an homopolymer. The backbone of homopolymer entirely builds up the same repeating units.
M1 - M1 - M1- M1 - M1 - M1 - M1
Copolymer
A polymer which has two different repeating units is called copolymer and the process by which it is synthesised is referred to as copolymerisation.
---------M1 – M2 ¬– M1¬ – M2 – M1 – M2– M1 – M2 – M1 – M2 – M1---------
Graft Copolymer
Graft copolyerisation results from the formation of an active site at a point on a polymer molecule other than its end, exposure to second monomer. Most graft copolymers are formed by radical polymerisation. The major active reaction is chain transfer to polymer. In many instances the transfer reaction involves subtraction of a hydrogen atom. Ultraviolet or ionising radiation or redox initiation among other methods can also use to produce polymer radicals leading to graft copolymer. A graft copolymer is a branched copolymer with a backbone of a linear or homopolymer.