define the term (Plastic)
They are made of different materials, most of them are made with chemicals. The plastic ones are more natural. You can make a lot of different things with plastic: Cd's, plastic bottles, films, etc. They are malleable and they have plasticity, for this reason this material allows you to do a lot of different items.
Plastic covers a range of synthetic or semisynthetic polymerization products. They are composed of organic condensation or addition polymers and may contain other substances to improve performance or economics. There are few natural polymers generally considered to be plastics. Plastics can be formed into objects or films or fibers. Their name is derived from the fact that many are malleable, having the property of plasticity.
The term plastics covers a range of synthetic or semi-synthetic polymerization products. They are composed of organic condensation or addition polymers and may (often) contain other substances to improve performance or economics. There are few natural polymers generally considered to be plastics. Plastics can be formed into objects or films or fibers. Their name is derived from the fact that many are malleable, having the property of plasticity.
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In chemistry, 'plastic' usually denotes a thermoplastic polymer, one that can be molded into a shape (with the application of heat) which it will retain on cooling. Examples are: molded objects such as the ever-present bottles and jars used today (PE, HDPE, PET, etc stamped on bottom); extruded sheet (polyethylene, mylar); spun fibers (nylon, orlon). In general, these may be recycled by remolding them. This differs from a 'resin', which is usually 'set' (hardened) by heat, although the terms may shade into each other. These are generally not remoldable, so little recycling can be done. The objects made from resins are usually harder and stronger than plastics. :-)) Note the use of 'generally', 'usually'...polymer chemistry is a complicated multi-faceted field...thousands of polymers are known, some natural some synthetic, each with a different set of properties.
