Polymers & Plastics
,Polymers (derived from the Greek words, poly or many an
means units or parts) are macro molecules formed by
combination of a large number of small molecules know
monomers.
Polymers are high molecular weight compounds whose stru
are composed of a large number of simple repeating unit
repeating units are usually obtained from low molecular w
simple compounds referred to as monomers.
The properties of polymer depend on their mol
configuration, the degree of polymerization, branching and
linking.
Monomer is a micromolecule (smaller molecule) which com
with each other to form a polymer. Eg. Ethylene, vinyl chl
styrene, butadiene, acrylonitrile etc.,
,Polymerization: Polymerization is a process in which large numb
small molecules (called monomers) combine to form a big mole
(called a polymer) with or without elimination of small molecule
H2O, CH3OH etc.,
Degree of Polymerization (DP): It refers to the number of repe
units in the polymer molecule. The degree
polymerization of polyacrylonitrile is y. The definition given he
evidently useful only for polymers which have regular identif
repeating units.
Strength of the polymer can be increased
by increasing its DP
–High DP====hard and heat resistant
–Low DP=====soft, gummy
, AAAAAAAAABBBBBB
long sequences of a monomer ar
Consists of two or more followed by long sequences of an
constitutional Block monomer
repeating units (A.B )
AAAAAAAAAAAAAAA
Copolymer
Graft B B B
B B B
Classification
by monomer Alternating ABABABABABABABAB
composition are made of alternating sequen
of the different monomers
Homopolymer
Consist of only one type of
Statistical/ ABAABABBBAABAAB
constitutional two or more different repeatin
repeating unit (A) Random are distributed randomly
AAAAAAAAAAAAAAA
,Polymers (derived from the Greek words, poly or many an
means units or parts) are macro molecules formed by
combination of a large number of small molecules know
monomers.
Polymers are high molecular weight compounds whose stru
are composed of a large number of simple repeating unit
repeating units are usually obtained from low molecular w
simple compounds referred to as monomers.
The properties of polymer depend on their mol
configuration, the degree of polymerization, branching and
linking.
Monomer is a micromolecule (smaller molecule) which com
with each other to form a polymer. Eg. Ethylene, vinyl chl
styrene, butadiene, acrylonitrile etc.,
,Polymerization: Polymerization is a process in which large numb
small molecules (called monomers) combine to form a big mole
(called a polymer) with or without elimination of small molecule
H2O, CH3OH etc.,
Degree of Polymerization (DP): It refers to the number of repe
units in the polymer molecule. The degree
polymerization of polyacrylonitrile is y. The definition given he
evidently useful only for polymers which have regular identif
repeating units.
Strength of the polymer can be increased
by increasing its DP
–High DP====hard and heat resistant
–Low DP=====soft, gummy
, AAAAAAAAABBBBBB
long sequences of a monomer ar
Consists of two or more followed by long sequences of an
constitutional Block monomer
repeating units (A.B )
AAAAAAAAAAAAAAA
Copolymer
Graft B B B
B B B
Classification
by monomer Alternating ABABABABABABABAB
composition are made of alternating sequen
of the different monomers
Homopolymer
Consist of only one type of
Statistical/ ABAABABBBAABAAB
constitutional two or more different repeatin
repeating unit (A) Random are distributed randomly
AAAAAAAAAAAAAAA
