those plastics which when moulded once, can not be softened by heating. These are called thermosetting plastics. Twoexamples are bakelite and melamine.Bakelite is a poor conductor of heat and electricity. It is used for making electrical switches, handles of variousutensils, etc.
Those plastic which gets deformed easily on heating and can be bent easily are known as thermoplastics. e.g Polythene and PVC etc.These are used for manufacturing toys, combs and various types of containers.
. These are prepared from another type of synthetic fibre called acrylic ( artificial wool ) or false wool .The wool obtained from natural sources is quite expensive, whereas clothes made from acrylic are relatively cheap. They are available in a variety of colours. Synthetic fibres are more durable and affordable which makes them more …
All the synthetic fibres are prepared by a number of processes using raw materials of petroleum origin, calledpetrochemicals.
Polyester (Poly+ester) is actually made up of the repeating units of a chemical called an ester. Esters are thechemicals which give fruits their smell. Fabrics are sold by names like polycot, polywool, terrycot, etc. As the namesuggests, these are made by mixing two types of fibres. Polycot is a mixture of polyester and cotton. Polywool …
Polyester and Acrylic Polyester is another synthetic fibre. Fabric made from this fibre does not get wrinkled easily. It remains crisp and iseasy to wash. So, it is quite suitable for making dress material. You must have seen people wearing polyester shirts and other dresses. Terylene is a popular polyester. It can be drawn into …
Nylon is a man-made fibre. In 1931, It was prepared from coal, water and air. It was the first fully synthetic fibre. nylon fibre was strong, elastic and light. It was lustrous and easy to wash. So, it became very popular for making clothes. We use many articles made from nylon, e.g socks, ropes, tents, …
Viscous is a man-made fibre. It is cheaper than silk and can be woven like silk fibres. Thats why it is called artificial silk .
Viscous is synthetic fibre. It was obtained by chemical treatment of wood pulp. This fibre was called rayon or artificial silk. Although rayon is obtained from a natural source, wood pulp, yet it is a man-made fibre.
Cotton is made a natural polymer called cellulose. Cellulose is made up of a large number of glucose units.
