plastic
PLASTICS Plastics are materials formed by chains of carbon and hydrogen atoms. We call these chains polymers, while the atoms that form them are called monomers. There are three different types of plastics: 1 THERMOPLASTICS Thermoplastics are defined as polymers that can be melted and recast almost indefinitely. They are molten when heated and harden upon cooling. One of thermpoplastic characteristics is : they are reversible, so the material can be reheated, reshaped, and frozen repeatedly. As a result, thermoplastics are mechanically recyclable. Some of the most common types of thermoplastic are polypropylene, polyethylene, polyvinylchloride, polystyrene, polyethylenetheraphthalate and polycarbonate. PE :Polyethylene is a thermoplastic polymer with variable crystalline structure and an extremely large range of applications depending on the pa