(Source: VIII NCERT Science Chapter 3)
- Cotton, Wool, Silk are examples of natural fibres.
- Cotton is a polymer of cellulose.
- Rayon is artificial silk obtained by chemical treatment of wood pulp.
- Rayon is mixed with cotton to make bed sheets.
- Rayon is mixed with wool to make carpets.
- Nylon is first fully synthetic fiber.
- Nylon was prepared from coal, water and air.
- Nylon is used for making parachutes and ropes for rock climbing.
- A nylon thread is stronger than steel wire.
- Polyester fabric is wrinkle free.
- Terylene is a popular polyester.
- Polyester (PET) used for making bottles, utensils, films, wires etc.
- Acrylic is used to make sweaters, shawls.
- Polythene is an example of a plastic.
- Plastic which gets deformed easily on heating and can be bent easily are called thermoplastics.
- Plastics which moulded once cannot be softened by heating are called thermosetting plastics. eg. Bakelite and Melamine.
- Bakelite is poor conductor of heat and electricity. It is used for making switches, handles of utensils.
- Melamine can resist fire. It is used for making tiles, Kitchenware.
- Teflon is a special plastic on which oil and water do not stick.
- Cotton, Wool, Silk are examples of natural fibres.
- Cotton is a polymer of cellulose.
- Rayon is artificial silk obtained by chemical treatment of wood pulp.
- Rayon is mixed with cotton to make bed sheets.
- Rayon is mixed with wool to make carpets.
- Nylon is first fully synthetic fiber.
- Nylon was prepared from coal, water and air.
- Nylon is used for making parachutes and ropes for rock climbing.
- A nylon thread is stronger than steel wire.
- Polyester fabric is wrinkle free.
- Terylene is a popular polyester.
- Polyester (PET) used for making bottles, utensils, films, wires etc.
- Acrylic is used to make sweaters, shawls.
- Polythene is an example of a plastic.
- Plastic which gets deformed easily on heating and can be bent easily are called thermoplastics.
- Plastics which moulded once cannot be softened by heating are called thermosetting plastics. eg. Bakelite and Melamine.
- Bakelite is poor conductor of heat and electricity. It is used for making switches, handles of utensils.
- Melamine can resist fire. It is used for making tiles, Kitchenware.
- Teflon is a special plastic on which oil and water do not stick.