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About this activity

Presentación plásticos

Created by

Juan Pedro García
Juan Pedro García
Spain

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Presentación plásticos
 

Presentación plásticosOnline version

Presentación plásticos

by Juan Pedro García
1

Historia de los plásticos

QR
Vamos a comenzar visionando un vídeo en el que se hace un recorrido histórico desde los primeros plásticos hasta la época actual.
2

Polimerización

La polimerización es un proceso químico por el que los reactivos, monómeros (compuestos de bajo peso molecular) se agrupan químicamente entre sí, dando lugar a una molécula de gran peso, llamada polímero, o bien una cadena lineal o una macromolécula tridimensional.

Existen muchos tipos de polimerización y varios sistemas para categorizarlos. 

Las categorías principales son:

  • Polimerización por adición y condensación.
  • Polimerización de crecimiento en cadena y en etapas.
3

Propiedades de los plásticos

  1. Aislantes eléctricos: los plásticos no conducen la electricidad; por ello se utilizan para recubrir los cables o en mangos de herramientas.
  2. Baja conductividad térmica: los plásticos conducen poco o muy mal el calor; así por ejemplo, se emplean para mangos de sartenes, ollas...
  3. Resistencia mecánica: en general, y aunque depende del tipo de plástico, los plásticos suelen ser muy resistentes.
  4. Económicos: en general, los plásticos son un material barato (aunque hay excepciones)