Page 31 - Science Class 08
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v Its water-resistant property makes it ideal
for garments and jackets that are to be
used in wet or damp environments.
v It is used to make jackets and quilted
garments.
v PET is a form of polyester used to make
bo les, films, utensils, wires, etc. Polyester Pants Polyester Coat
v Polyester is used to make the most NEED FOR SYNTHETIC MATERIALS
commonly used fabrics like shirts, sarees, When we have already natural fibres to make
suits, bedsheets. clothes, bags, curtains, etc. then what is the
v It is because, polyester has wrinkle resis- need for synthe c fibres to make these things.
tant property and ability to retain its Actually, all the natural fibres are obtained from
shape. Since it is also strong fibre and plants or animals. It means, these fibres are
these frequently used fabrics are long organic materials. These, fibres are, no doubt,
las ng. beau ful and comfortable, but they are not
v Since, polyester is water resistant, it is used very much durable. Besides, these fibres are
to make the garments which can be used in costly as compared to synthe c fibres.
wet and damp environments. Moreover, these fibres are produced in limited
quan ty which is not enough to meet the
v Many garments for the protec on of
excessive cold are made of polyester. clothing requirement of the ever growing
popula on. These are some important reasons
v Polyester can be moulded in any shape.
that forced man to use man-made or synthe c
Besides, insula ng properly can also be
fibres. The clothes made of synthethic fibres
added to it. We can make it insulated by
are a rac ve as well as durable. Morever, the
crea ng hollow in polyester fibre. The
hollow space traps air inside it which is clothes made of synthe c fibres are cheaper
than that of the clothes made of natural fibres.
then heated by the body. In this way, the
warm air stays inside and keeps our body Another great advantage of synthe c fibres is
warm. that we can make fabrics having desired
proper es. The fabrics made of synthe c fibres
v Polyester is also used in making some
can be used not only in making cloth, but also
other items like carpet, ropes, filters and
in making parachutes, matresses, umbrella, etc.
films.
POLYMERISATION
Polymerisa on is the process wherein alkene
monomers are joined together into long
polymer chains. The opposite of cracking
(breaking polymer chains down into mono-
mers), the double carbon bond is broken and
Nylon Nylon Polyester the alkene becomes saturated with hydrogen,
Stockings Toothbrush Bag
forming one large chain, o en billions of
Science-8 31
