It is an addition of polymer of styrene monomer. It is manufactured by the addition polymerization of styrene in the presence of benzoyl peroxide as the free radical initiator.

Chemical rxn:

n C6H5-CH=CH2 ------------>-(-CH2-CH(C6H5)-)n 

( Styrene)                                   ( Polystyrene) 

It is resistant to halogen acids and alkalies . It is used for making toys, brass handles,combs, television, cabinets, cups, refrigerator lining, rigid foams, for insulation and false roofing.

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