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What are plastics | Fantastic Plastic information the scientific approach

Curiously, it is not easy to define plastics in simple terms. This is because, like other materials wood or metal, they are a large family of materials combined.

Posted by worthmoney on August 6, 2014

What are plastics | Fantastic Plastic information the scientific approach

Curiously, it is not easy to define plastics in simple terms. This is because, like other materials wood or metal, they are a large family of materials combined which have certain features in common.

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For example: All plastics are polymers. Polymers are giant molecules which occur both in nature or can be man made. A molecule of water, for example, is formed of three atoms H20. A typical plastics molecule can comprise 100000 atoms. All plastics can be formed into shape. Plastics soften when heated i.e. become plastic, and it is at this stage that they can be moulded or otherwise formed into their final shape usually by heat and pressure.

Most plastics are organic i.e. they have a molecular backbone of carbon atoms.

Plastics fall into two types

Thermoplastics are those which will soften when heated and harden on cooling, a process which can be repeated over and over again. Vinyl and polyethylene are well known examples.

Thermosets are those materials which soften and harden only once when they are first heated. Examples are phenolics (bakelite) melamine, and polyester resins.

Plastics can also be classified in another way as natural, semisynthetic and synthetic



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