Glass transition of polystyrene model molecules

Sumnary The glass transition temperatures of 2,4-diphenylpentane, 2,4,6triphenylheptane and 2,4,6,8-tetraphenylnonane are shown to follow the relation Tg = 325 – 2.64 × 10⁴/M_n where M_n is the molecular weight. 2,4-diphenylpentane-2,4,6-triphenylheptane mixtures exhibit only one glass transition temperature which follow the relation Tg = (1 – ₂) Tg₁ + ₂ Tg₂ where ₂ is the weight % of 2,4-diphenylpentane. The configurational structure of these polystyrene model molecules is shown to slightly influence the Tg's values.