Polystyrene is a long-chain hydrocarbon polymer. Its chemical structure consists of repeated units of the monomer styrene. The polymerization process results in a linear chain of styrene molecules linked together. it is a naturally transparent and synthetic thermoplastic
The three most important grades of styrene are:
GPPS: General-purpose polystyrene, also known as crystal-clear polystyrene, is a fully transparent, rigid and rather brittle low cost thermoplastic made from styrene monomer. GPPS is a solid product manufactured in the form of 2-5 mm pellets.
HIPS: High impact polystyrene contains usually 5 to 10% rubber (butadiene) and is used for parts, which require high(er) impact resistance. HIPS is a graft copolymer having polystyrene sidearm. The grafting occurs when some of the radicals react with the double bonds of the polybutadiene.
EPS: Expandable polystyrene consists of micro-pellets or beads containing a blowing agent (usually pentane). The expanded or foamed polystyrene is thermally insulating and has high impact resistance.
Applications:
Uses include protective packaging (such as packing peanuts and CD and DVD cases), containers, lids, bottles, cups ,sheet, trays, tumblers, disposable cutlery and in the making of models.
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