Multiple choice

Which of the following statements is/are true?

  1. Polycaprolactam has higher Tm than polycaprolactone.
  2. Polyethylene oxide has a higher crystalline melting temperature than polyethylene.
  3. Poly(1,4-cis-butadiene) has higher Tg than Poly(1,4-trans-butadiene).

  1. Only 1

  2. Only 2

  3. Only 3

  4. Only 1 and 2

  5. Only 2 and 3
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A Correct answer
Explanation

The densities of the interunit linkages in polycaprolactone (ester units) and polycaprolactam (amide units) are the same. However, the amide units are more polar than the ester units. Consequently, polycaprolactam (226° C) has a much higher Tm than polycaprolactone (61° C).

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