Video: Classification of Polymers Video Lecture | Chemistry for JEE Main & Advanced

explain polymers and the classification
polymers are molecular compounds whose
molecules have high molecular masses and
are composed of a large number of
repeating units of identical structures
which are known as monomers polythene is
an example of polymer which consists of
linkage of a large number of ethene
molecules they're both
naturally-occurring and synthetic
polymers polymers such as proteins
starches and cellulose are found in
nature and unknown as naturally
occurring polymers on the other hand
polymers such as plastics which are
produced commercially on a very large
scale and have a wide range of
properties and users are known as
synthetic polymers there are various
parameters on the basis of which
polymers are classified polymers can be
classified on the basis of chemical
structure or on the basis of polymeric
structure or on the basis of the
arrangement of monomers or on the basis
of tacit ecity or on the basis of
thermal behavior or on the basis of
molecular forces or on the basis of
their methods of synthesis let's discuss
how these polymers are classified into
different categories on the basis of
chemical structure polymers are
classified as homo polymer and copolymer
homo polymer consists of identical
monomers
whereas copolymer is a mixture of more
than one type of monomer on the basis of
polymeric structures polymers are
classified as linear polymers branched
polymers are cross-linked polymers
linear polymers consist of a long string
of monomers attached in a linear manner
polymers with branches at irregular
intervals along the polymer chain are
called branched polymers cross-linked
polymers contain short side chains that
connect different polymer chains into a
network on the basis of arrangement of
monomers polymers are classified as
block polymers and graft polymers block
polymers consist of relatively low
sequences of identical monomeric units
whereas graft polymers are those
branched polymers whose backbone is
formed from one type of monomer and
branches are formed from the other type
on the basis of tacit ecity that is the
orientation of monomer units in a
polymer molecule with respect to the
main chain polymers are classified as
isotactic polymers syndiotactic polymers
and atactic polymers isotactic polymers
are those polymers in which the side
groups of the monomers lie on the same
side of the chain on the other hand if
the side groups of polymers are arranged
in an alternate manner such polymers are
known as syndiotactic polymers whereas
if the side groups are arranged in an
irregular or random manner around the
main chain such polymers are referred to
as a tactic polymers on the basis of
thermal behavior that is behavior of
polymers upon heating polymers are
classified as thermoplastics and
thermosets thermoplastics are those
polymers which are easily softened upon
heating so that they can be converted to
any shape by molding polythene
polystyrene are some examples of
thermoplastics whereas thermo sets are
those polymers which change irreversibly
into hard and rigid materials on heating
and cannot be reshaped common examples
of thermo sets are Bekaa light melamine
formaldehyde polymers can also be
classified on the basis of
intermolecular forces as elastomers and
fibers elastomers are polymers that can
be easily stretched by applying small
stress elastomers have elastic character
because the polymer chains are held
together by weak intermolecular forces
natural rubber is a very common example
of elastomer on the other hand fibers
are the polymers which have strong
intermolecular forces like hydrogen
bombs or dipole-dipole interactions
between the polymer chains and due to
these strong intermolecular forces the
polymer chains are packed and are less
elastic nylon 6-6 Dacron and silk are
some common examples of fibres
polymers can also be classified on the
basis of methods of synthesis into two
types addition polymers and condensation
polymers