Preparation and uses of plastics: 1.Polythene, 2.Pvc, 3.Teflon, 4.Polystyrene, 5.Urea-formaldehyde, 6.Bakelite, 7.Rubber, 8.Natural rubber

1.Polyethylene:

Polyethylene is a thermoplastic polymer made from ethylene monomers.
Polyethylene can be produced in high-density or low-density forms, depending on the reaction conditions.
Polyethylene is used in packaging, construction, and consumer goods.
Polyethylene can be extruded, molded, or blown into various shapes and sizes.
Polyethylene can be recycled and reused in many applications.

Teflon is a brand name for a group of fluoropolymer resins made from tetrafluoroethylene monomers.
Teflon is known for its non-stick properties, making it useful in cooking and food processing.
Teflon is also used in industrial applications, such as coatings for pipes and wire.
Teflon has a high melting point and is resistant to chemicals and corrosion.
Teflon can be molded, extruded, or applied as a coating.

Polystyrene is a thermoplastic polymer made from styrene monomers.
Polystyrene can be produced in rigid or foam forms, depending on the reaction conditions.
Polystyrene is used in packaging, insulation, and consumer goods.
Polystyrene foam is also used in food service, such as cups and containers.
Polystyrene can be extruded, molded, or foamed.

Urea-formaldehyde is a thermosetting polymer made from urea and formaldehyde.
Urea-formaldehyde is used in wood products, such as particleboard and plywood.
Urea-formaldehyde is known for its strength, stability, and resistance to moisture.
Urea-formaldehyde is cured using heat and pressure, making it rigid and stable.
Urea-formaldehyde can be molded or applied as a coating.

Bakelite is a thermosetting polymer made from phenol and formaldehyde.
Bakelite was the first synthetic plastic invented and was widely used in electrical and mechanical applications.
Bakelite is highly heat-resistant and electrically insulating.
Bakelite can be molded or cast into complex shapes and sizes.
Bakelite has been largely replaced by newer materials but is still used in some niche applications.

Rubber is a natural polymer made from the sap of rubber trees or synthetic polymers made from petrochemicals.
Rubber is used in tires, hoses, gaskets, and many other applications.
Rubber can be processed using different methods to achieve different properties, such as natural rubber, butyl rubber, or neoprene rubber.
Rubber can be vulcanized to improve its strength and durability.
Rubber is affected by temperature and can become brittle or soft depending on the conditions.

Natural rubber is a polymer made from the sap of rubber trees, primarily grown in Southeast Asia.
Natural rubber is highly elastic and can stretch up to six times its original length.
Natural rubber is used in tires, footwear, and other applications where flexibility and strength are important.
Natural rubber is vulnerable to degradation from heat, sunlight, and chemicals.
Natural rubber can be vulcanized to improve its strength and durability.