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SAY IT IN ENGLISH GA-4 // polymer classification, image, image, image,…
SAY IT IN ENGLISH GA-4 // polymer classification
Natural Polymers:
They occur naturally and are found in plants and animals
proteins, starch, cellulose, and rubber
we also have biodegradable polymers
which are called biopolymers
are formed without the intervention of man
It can take up to years for the creation of these
What are polymers?
A polymer is a substance made up of large molecules, or macromolecules.
formed by covalent bonding
of one or more simple units called monomers
great variety of properties
great importance in our daily life
Synthetic Polymers:
These are man-made polymers
Plastic is the most common and widely used synthetic polymer
are macromolecules formed by the union of monomers
artificially obtained
Semi-synthetic Polymers
They are derived from naturally
occurring polymers and undergo further chemical modification
cellulose nitrate, cellulose acetate.
in these processes if the human intervenes
Classification Based on Molecular Forces
Elastomers
These are rubber-like solids
weak interaction forces are present
Rubber
Fibres
Strong, tough, high tensile strength
strong forces of interaction are present
nylon
Thermoplastics
These have intermediate forces of attraction
polyvinyl chloride
Thermosetting polymers
These polymers greatly improve the material’s mechanical properties
It provides enhanced chemical
heat resistance
phenolics, epoxies, and silicones.
artificially obtained
Addition Polymerization
poly ethane, Teflon, Polyvinyl chloride (PVC)
Condensation Polymerization
Nylon -6, 6, perylene, polyesters.
Classification Based on Monomers
Heteropolymer or co-polymer
It consists of different type of monomer units
nylon
Homomer
In this type, a single type of monomer unit is present
Polyethene
Based on structure
linear Polymer
Branched Chain polymer
Cross Linked polymer
Alza, Barbosa, Garcia, Mora 11C
