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Origin of plastics

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The basics of the production of plastic granules to be used for making plastic objects.

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Origin of plastics

The basics of the production of plastic granules to be used for making plastic objects.

Manuel Jesús García Rodríguez
1

join PP petroleum refineries polymerisation colour properties natural PE monomers

Depending on their origin , plastics can be classified in plastics and synthetic plastics .
a ) Natural plastics are obtained directly from raw vegetable materials - for example , cellulose or latex , or from animal proteins . An example of a natural plastic is rubber .
b ) Synthetic plastics are made from compounds extracted from . The majority of plastics belong to this group .
Synthetic plastics are obtained in two stages :
1 ) First , petroleum is transformed in into different substances with molecules called . Examples of monomers are the ethylene ( etileno ) or the propylene ( propileno ) .
2 ) Then , these monomers go through a chemical reaction called , where the monomers with each other until a huge molecule ( macromolecule ) is created . This macromolecule is called polymer or plastic . Examples of polymers are the polyethylene ( polietileno , ) or the polypropylene ( polipropileno , )
During the polymerisation reaction , we can add some additives to obtain plastics with better , and we can also add pigments to give them .