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Polystyrene
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====Atactic polystyrene==== The only commercially important form of polystyrene is ''atactic'', in which the phenyl groups are [[randomness|randomly]] distributed on both sides of the polymer chain. This random positioning prevents the chains from aligning with sufficient regularity to achieve any [[crystallinity]]. The plastic has a glass transition temperature ''T''<sub>g</sub> of β90 Β°C. Polymerization is initiated with [[free radical]]s.<ref name=Ullmann>Maul, J.; Frushour, B. G.; Kontoff, J. R.; Eichenauer, H.; Ott, K.-H. and Schade, C. (2007) "Polystyrene and Styrene Copolymers" in ''Ullmann's Encyclopedia of Industrial Chemistry'', Wiley-VCH, Weinheim, {{doi|10.1002/14356007.a21_615.pub2}}</ref>
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