What can plastic be used for?
The– also called plastic – appeared on the market at the beginning of XX th century.
Its qualities – hygiene,to shocks and temperature variations, ease of shaping, rot-proofness, etc. – quickly allowed him to make himself indispensable.
Today, it is everywhere around us, from jars ofto bottles of milk to toys, cooking utensils, sports equipment and school supplies.
But his supremacy begins to be challenged. Becausethreatens our environment more and more.
Beyond the delicate issue of disposable products – some of which are progressively banned from the market – raises the problem of the collection and.
At the heart of plastic
At the base of the plastic is a, a made up of long carbon chains. This is obtained by processing , or .
Each polymer has properties, structure and size. And to improve these characteristics can be added different substances fillers, plasticizers or other additives.
If there is a wide variety of plastics, there are generally two broad categories:and .
Themelt under the effect of and solidify as a result of cooling. For , the transformation is irreversible. Once formed, the plastic no longer deforms.
Examples of plastics
- The low density (LDPE), invented in 1933, is a soft product, thermoplastic. It is mainly used for , packaging films, etc.
- Polyvinyl ( ) is a thermoplastic polymer widely used for pipes, , etc.
- Polyepoxides, commonly referred to as “ ”, are thermosetting plastics. They are found, among others, in and paints.
- Note that now also produced plastics of biological origin, from cane, for example. The that can be extracted allows in this case to manufacture (PE).
- Fluoropolymers, for their part, correspond to a family of high performance plastics used in particular as flame retardants or as coating for tanks .