SYNTHETIC FIBRES AND PLASTICS Ms. ANUPAMA SINGH

PLASTICS It is a polymer which can be moulded into various shapes, can be recycled, remoulded and reused.It is a polymer which can be moulded into various shapes, can be recycled, remoulded and reused.

TYPES OF PLASTICS Plastics are of two types:Plastics are of two types: ThermoplasticsThermoplastics Thermosetting plasticsThermosetting plastics

THERMOPLASTICS Plastics which can be moulded on heating and used again.Plastics which can be moulded on heating and used again. Example: polythene, PVC.Example: polythene, PVC.

The arrangement of particles (monomers) in thermoplastics is linear and these can be recycled.The arrangement of particles (monomers) in thermoplastics is linear and these can be recycled.

POLYTHENE Monomer: etheneMonomer: ethene Use: for making polythene bags, toys and combs.Use: for making polythene bags, toys and combs.

PVC (POLY VINYL CHLORIDE) Monomer: vinyl chlorideMonomer: vinyl chloride Use: for making pipes, toys and combs.Use: for making pipes, toys and combs.

THERMOSETTING PLASTIC Plastic which once set cannot be moulded on heating.Plastic which once set cannot be moulded on heating. Example: Bakelite and melamine.Example: Bakelite and melamine.

The arrangement of particles (monomers) in thermosetting plastic is cross linked and these cannot be recycled.The arrangement of particles (monomers) in thermosetting plastic is cross linked and these cannot be recycled.

BAKELITE It is a poor conductor of heat and electricity.It is a poor conductor of heat and electricity. Use: for making electrical switches, handles of various utensils.Use: for making electrical switches, handles of various utensils.

MELAMINE It is resistant to fire and can tolerate heat.It is resistant to fire and can tolerate heat. Use: for making floor tiles, kitchen ware and fabrics which resist fire.Use: for making floor tiles, kitchen ware and fabrics which resist fire.