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Thermoplastics:
Thermoplastics are linear
polymers having molecules in the shape of long chain which
are not interconnected. These consists of long molecular
chains entangles with one another but are not bonded
together. The inherent plasticity increases with increase
in temperature. They do not undergo chemical change in the
moulding operations. When heated, they soften and on
cooling, they harden. They retain the shape given to them
upon heating. The scrap of thermoplastic resins can be
remolded and reworked. Some of the common thermoplastics
are
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