Study of Plastic Moulding Polymers.
A. The study of Plastic Moulding Polymers.
● Plastic materials are the result of the combination of carbon elements reacting with
oxygen, hydrogen, nitrogen, and other organic and inorganic elements.
● Monomers are organic molecules containing a double bond or a minimum of two active
functional groups. The presence of the double bond or active functional groups act as the
driving force to add one monomer molecule upon the other repeatedly to make a polymer
molecule by process of polymerization.
● Polymerization can take place in various ways
1) Addition or chain polymerization
2) Coordination polymerization
3) Step polymerization
4) Supramolecular polymerization
5) Copolymerization
● These polymers have the ability to change into a liquid (melt) and are capable of being
formed into shapes by the application of heat and pressure.
● The polymers are processed by melt processes, such as moulding and extrusion. They are
divided into Thermoplastics, Thermosetting Plastics and Elastomers.
Thermoplastic Polymer:-
● A thermoplastic, or thermoset plastic, is a plastic polymer material that becomes pliable
or mouldable at a certain elevated temperature and solidifies upon cooling.
● The polymer chains are associated with intermolecular forces, which weaken rapidly with
increased temperature, yielding a viscous liquid. In this state, thermoplastics may be
reshaped and are typically used to produce parts by various polymer processing
techniques such as injection moulding, compression moulding, calendering,
and extrusion.
Thermosetting Polymer:-
● A thermosetting plastic or a thermoset is defined as a material that once shaped by heat
and pressure is incapable of being re-processed by further applications of heat and
pressure.
A. The study of Plastic Moulding Polymers.
● Plastic materials are the result of the combination of carbon elements reacting with
oxygen, hydrogen, nitrogen, and other organic and inorganic elements.
● Monomers are organic molecules containing a double bond or a minimum of two active
functional groups. The presence of the double bond or active functional groups act as the
driving force to add one monomer molecule upon the other repeatedly to make a polymer
molecule by process of polymerization.
● Polymerization can take place in various ways
1) Addition or chain polymerization
2) Coordination polymerization
3) Step polymerization
4) Supramolecular polymerization
5) Copolymerization
● These polymers have the ability to change into a liquid (melt) and are capable of being
formed into shapes by the application of heat and pressure.
● The polymers are processed by melt processes, such as moulding and extrusion. They are
divided into Thermoplastics, Thermosetting Plastics and Elastomers.
Thermoplastic Polymer:-
● A thermoplastic, or thermoset plastic, is a plastic polymer material that becomes pliable
or mouldable at a certain elevated temperature and solidifies upon cooling.
● The polymer chains are associated with intermolecular forces, which weaken rapidly with
increased temperature, yielding a viscous liquid. In this state, thermoplastics may be
reshaped and are typically used to produce parts by various polymer processing
techniques such as injection moulding, compression moulding, calendering,
and extrusion.
Thermosetting Polymer:-
● A thermosetting plastic or a thermoset is defined as a material that once shaped by heat
and pressure is incapable of being re-processed by further applications of heat and
pressure.
