Multiple choice

Calculate the Tg of butadiene–styrene copolymer containing 20 vol% styrene.

    • 44° C

  2. 44° C
    • 80° C

  4. 80° C

  5. 100° C
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Explanation

Butadiene and styrene form a completely compatible random copolymer. Therefore, the following relation is applicable: Tg = V1Tg1 + V2Tg2. Assume 1= polybutadiene 2 = polystyrene Tg1 = -80° C; Tg2 = 100° C Tg = 0.80 (-80) + 0.20 (100) = - 64 + 20 = - 44° C

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