Thermoplastics and Injection Molding

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Issue:

Science

 

Written by:

Jung M

 

Date added:

July 19, 2012

 

Level:

University

 

Grade:

A

 

No of pages / words:

8 / 2228

 

Was viewed:

2291 times

 

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Essay content:

Thermoplastic polymers differ from thermosetting polymers (Bakelite; vulcanized rubber) which once formed and cured, can never be remelted and remolded. Many thermoplastic materials are addition polymers; e.g., vinyl chain-growth polymers such as polyethylene, polyvinyl chloride and polypropylene, and others like polystyrene, polyester, acrylics, nylons and cellulosics Thermoplastics can be melted and re-molded, and thus they can be recycled...
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This also means that they can be farbricated by processes that use plastic flow. Injection Molding is one such process. History of Thermoplastics ? 1868 - John Wesley Hyatt injection molds Celluloid billiard balls. ? 1926 - Vinyl or PVC - Walter Semon invented a plasticized PVC. ? 1936 - Acrylic or Polymethyl Methacrylate ? 1937 - Polyurethanes tradenamed Igamid for plastics materials and Perlon for fibers...
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