Multiple choice

Toluene behaves as a plasticiser for polystyrene. What is the Transition temperature (Tg) of a polystyrene sample containing 30 vol% toluene?

  1. 100° C
    • 100° C
    • 50° C

  4. 55° C
    • 55° C
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D Correct answer
Explanation

Since, toluene is completely compatible with polystyrene. Tg = V1Tg1 + V2Tg2 where, Tg1, Tg2 = Glass transition temperature of polystyrene and toluene respectively. V1, V2 = Volume fraction of polystyrene and toluene respectively. Tg1 = 100° C Assuming Tg2 = Melting point of toluene = -50° C Tg = 0.70 (100) + 0.30 (-50) = 70 - 15 = 55° C

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