Chap._400001 - Chapter 4 4.1 Scope and Raw Materials...

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Chapter 4 Polystyrene and Styrene Copolymers 4.1 Scope and Raw Materials In this chapter the polystyrene homopolymer is considered together with its copolymers. Polystyrene (PS) Poly(styrene-co-acrylonitrile) (SAN) Rubber-modified PS acrylonitrile-butadiene-styrene copolymer (ABS) Commercial interest in polystyrene began in the 1930s when the material was found to have good electrical insulation characteristics. During the WWII, enormous quantities of styrene were produced in USA for use in the synthetic rubber (SBR) program which was undertaken when supplies of natural rubber were no longer available. Thus when the war ended and natural rubber supplies were resumed, a large styrene capacity was available for civilian use and new outlets were sought. Applications for polystyrene were vigorously explored and the material was quickly adopted in many fields. Polystyrene is now one of the major commercial plastics, being very extensively used in such diverse applications as domestic appliances, food containers, packaging, expanded form, thermal insulation. The bulk of commercial styrene is prepared from benzene and ethylene by two steps, a Friedel-Crafts
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This note was uploaded on 10/16/2010 for the course MATSE 441 at Pennsylvania State University, University Park.

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